Hydrogen

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Gas phase thermochemistry data

Go To: Top, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Quantity Value Units Method Reference Comment
S°gas,1 bar31.2333 ± 0.0007cal/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
S°gas,1 bar31.233cal/mol*KReviewChase, 1998Data last reviewed in March, 1977

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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View table.

Temperature (K) 298. to 1000.1000. to 2500.2500. to 6000.
A 7.9030064.43668310.376090
B -2.7159222.929578-1.026071
C 2.732508-0.6835050.304117
D -0.6627330.064110-0.023154
E -0.0378960.472751-4.907711
F -2.385468-0.274244-9.205344
G 41.27819637.35376038.738373
H 0.00.00.0
ReferenceChase, 1998Chase, 1998Chase, 1998
Comment Data last reviewed in March, 1977; New parameter fit October 2001 Data last reviewed in March, 1977; New parameter fit October 2001 Data last reviewed in March, 1977; New parameter fit October 2001

Phase change data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director

Quantity Value Units Method Reference Comment
Ttriple0.KN/ARoder, Childs, et al., 1973TRC
Ttriple13.95KN/AClusius and Weigand, 1940Uncertainty assigned by TRC = 0.06 K; see property X for dP/dT for c-l equil.; TRC
Ttriple13.96KN/AHenning and Otto, 1936Uncertainty assigned by TRC = 0.05 K; temperature measured with He gas thermometer; TRC
Quantity Value Units Method Reference Comment
Ptriple0.atmN/ARoder, Childs, et al., 1973TRC
Ptriple0.0712atmN/AHenning and Otto, 1936Uncertainty assigned by TRC = 0.0004 atm; TRC
Quantity Value Units Method Reference Comment
Tc33.18KN/AOnnes, Crommelin, et al., 1917Uncertainty assigned by TRC = 0.2 K; derived from P-V-T measurements; TRC
Quantity Value Units Method Reference Comment
Pc12.83atmN/AOnnes, Crommelin, et al., 1917Uncertainty assigned by TRC = 0.0117 atm; derived from vapor pressure extrapolated to Tc; TRC
Quantity Value Units Method Reference Comment
ρc15.4mol/lN/AOnnes, Crommelin, et al., 1917Uncertainty assigned by TRC = 2. mol/l; by extrapolation of rectilinear diameter to Tc; TRC

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (atm)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
21.01 to 32.273.5374399.3957.726van Itterbeek, Verbeke, et al., 1964Coefficents calculated by NIST from author's data.

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
MS - José A. Martinho Simões
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
B - John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Reactions 1 to 50

Dicobalt octacarbonyl (solution) + Hydrogen (solution) = 2Cobalt, tetracarbonylhydro- (solution)

By formula: C8Co2O8 (solution) + H2 (solution) = 2C4HCoO4 (solution)

Quantity Value Units Method Reference Comment
ΔrH°4.7 ± 0.2kcal/molEqSRathke, Klingler, et al., 1992solvent: Supercritical carbon dioxide; Temperature range: 333-453 K. The results corrected for 1 atm pressure of H2 are 3.99 kcal/mol and -17.6 J/(mol K) Rathke, Klingler, et al., 1992; MS
ΔrH°3.1 ± 0.2kcal/molEqSBor, 1986solvent: n-Hexane; Temperature range: ca. 300-420 K; MS
ΔrH°6.31kcal/molKinSAlemdaroglu, Penninger, et al., 1976solvent: n-Heptane; The reaction enthalpy relies on the experimental values for the forward and reverse activation enthalpies, 72.4 and 11.0 kcal/mol, respectively Alemdaroglu, Penninger, et al., 1976. A rather different value has, however, been reported for the activation enthalpy of the forward reaction, 25.00 kcal/mol Ungváry, 1972; MS
ΔrH°6.60kcal/molEqSAlemdaroglu, Penninger, et al., 1976solvent: n-Heptane; Temperature range: 353-428 K; MS
ΔrH°3.20kcal/molEqSUngváry, 1972solvent: n-Heptane; Temperature range: 307-428 K. The results corrected for 1 atm pressure of H2 are 4.30 kcal/mol and -10.9 J/(mol K) Rathke, Klingler, et al., 1992; MS

H3+ + Hydrogen = (H3+ • Hydrogen)

By formula: H3+ + H2 = (H3+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°6.9 ± 0.4kcal/molAVGN/AAverage of 4 out of 11 values; Individual data points
Quantity Value Units Method Reference Comment
ΔrS°17.4 to 17.4cal/mol*KRNGN/ARange of 6 values; Individual data points

C11H2O11Os (solution) + Carbon monoxide (solution) = Hydrogen (g) + Osmium, dodecacarbonyltri-, triangulo (solution)

By formula: C11H2O11Os (solution) + CO (solution) = H2 (g) + C12O12Os3 (solution)

Quantity Value Units Method Reference Comment
ΔrH°-9.0 ± 2.3kcal/molES/KSPoë, Sampson, et al., 1993solvent: Decalin; Calculated from equilibrium and kinetic data Poë, Sampson, et al., 1993.; MS
ΔrH°-18.5 ± 2.3kcal/molN/APoë, Sampson, et al., 1993solvent: Decalin; Calculated from data for the reactions Os3(CO)10(H)2(solution) + CO(solution) = Os3(CO)11(H)2(solution) (hrxn [kJ/mol]=-39.7±1.3, srxn [J/(mol K)]=-80.3±3.8) and Os3(CO)11(H)2(solution) + CO(solution) = Os3(CO)12(solution) + H2(g) (hrxn [kJ/mol]=-37.7±9.6, srxn [J/(mol K)]=-32.6±27.6) Poë, Sampson, et al., 1993.; MS

Cyclohexene + Hydrogen = Cyclohexane

By formula: C6H10 + H2 = C6H12

Quantity Value Units Method Reference Comment
ΔrH°-28. ± 1.kcal/molAVGN/AAverage of 8 values; Individual data points

Chromium, hexacarbonylbis(η5-2,4-cyclopentadien-1-yl)di-, (Cr-Cr) (cr) + Hydrogen (g) = 2C8H6CrO3 (cr)

By formula: C16H10Cr2O6 (cr) + H2 (g) = 2C8H6CrO3 (cr)

Quantity Value Units Method Reference Comment
ΔrH°-3.32 ± 0.96kcal/molRSCLandrum and Hoff, 1985The reaction enthalpy was obtained from the value for the reaction 2Cr(Cp)(CO)3(H)(cr) + 1,3-cy-C6H8(solution) = [Cr(Cp)(CO)3]2(cr) + cy-C6H10(solution), -23.5 ± 0.91 kcal/mol Landrum and Hoff, 1985, together with the calculated enthalpy for 1,3-cy-C6H8(l) + H2(g) = cy-C6H10(l), -112.2±1.3 Pedley, 1994. It was assumed that 1,3-cy-C6H8 and cy-C6H10 have similar solution enthalpies in heptane; MS
ΔrH°-3.6 ± 1.0kcal/molDSCLandrum and Hoff, 1985The reaction enthalpy was obtained from the value for the reaction 2Cr(Cp)(CO)3(H)(cr) + 1,3-cy-C6H8(solution) = [Cr(Cp)(CO)3]2(cr) + cy-C6H10(solution), -23.5 ± 0.91 kcal/mol Landrum and Hoff, 1985, together with the calculated enthalpy for 1,3-cy-C6H8(l) + H2(g) = cy-C6H10(l), -112.2±1.3 Pedley, 1994. It was assumed that 1,3-cy-C6H8 and cy-C6H10 have similar solution enthalpies in heptane; MS

Hydrogen + 1-Hexene = n-Hexane

By formula: H2 + C6H12 = C6H14

Quantity Value Units Method Reference Comment
ΔrH°-30.0 ± 0.6kcal/molAVGN/AAverage of 8 values; Individual data points

(H3+ • Hydrogen) + Hydrogen = (H3+ • 2Hydrogen)

By formula: (H3+ • H2) + H2 = (H3+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°3.3 ± 0.2kcal/molPHPMSHiraoka, 1987gas phase; M
ΔrH°3.1kcal/molHPMSBeuhler, Ehrenson, et al., 1983gas phase; M
ΔrH°3.4kcal/molHPMSBeuhler, Ehrenson, et al., 1983gas phase; deuterated; M
ΔrH°4.1kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
ΔrH°1.8kcal/molHPMSBennett and Field, 1972gas phase; Entropy change is questionable; M
Quantity Value Units Method Reference Comment
ΔrS°17.4cal/mol*KPHPMSHiraoka, 1987gas phase; M
ΔrS°16.9cal/mol*KHPMSBeuhler, Ehrenson, et al., 1983gas phase; M
ΔrS°16.1cal/mol*KHPMSBeuhler, Ehrenson, et al., 1983gas phase; deuterated; M
ΔrS°19.8cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M
ΔrS°10.8cal/mol*KHPMSBennett and Field, 1972gas phase; Entropy change is questionable; M

Hydrogen + 1-Heptene = Heptane

By formula: H2 + C7H14 = C7H16

Quantity Value Units Method Reference Comment
ΔrH°-29.8 ± 0.5kcal/molAVGN/AAverage of 6 values; Individual data points

1-Octene + Hydrogen = Octane

By formula: C8H16 + H2 = C8H18

Quantity Value Units Method Reference Comment
ΔrH°-30. ± 2.kcal/molAVGN/AAverage of 7 values; Individual data points

Hydrogen anion + Hydrogen cation = Hydrogen

By formula: H- + H+ = H2

Quantity Value Units Method Reference Comment
ΔrH°400.40kcal/molN/AShiell, Hu, et al., 2000gas phase; Given: 139714.8±1 cm-1 at 0K, or 399.465±0.003 kcal/mol; B
ΔrH°400.40kcal/molN/APratt, McCormack, et al., 1992gas phase; 399.46±0.01 kcal/mol at 0K; 0.94 correction, Gurvich, Veyts, et al.; B
ΔrH°400.40kcal/molD-EALykke, Murray, et al., 1991gas phase; Reported: 6082.99±0.15 cm-1, or 0.754195(18) eV; B
Quantity Value Units Method Reference Comment
ΔrG°394.20 ± 0.10kcal/molH-TSShiell, Hu, et al., 2000gas phase; Given: 139714.8±1 cm-1 at 0K, or 399.465±0.003 kcal/mol; B
ΔrG°394.20kcal/molH-TSLykke, Murray, et al., 1991gas phase; Reported: 6082.99±0.15 cm-1, or 0.754195(18) eV; B

Hydrogen + Cyclopentene = Cyclopentane

By formula: H2 + C5H8 = C5H10

Quantity Value Units Method Reference Comment
ΔrH°-26.94 ± 0.13kcal/molChydAllinger, Dodziuk, et al., 1982liquid phase; solvent: Hexane; ALS
ΔrH°-26.8 ± 0.2kcal/molChydRoth and Lennartz, 1980liquid phase; solvent: Cyclohexane; ALS
ΔrH°-26.04 ± 0.44kcal/molChydTurner, Jarrett, et al., 1973liquid phase; solvent: Acetic acid; ALS
ΔrH°-26.2 ± 0.2kcal/molChydRogers and McLafferty, 1971liquid phase; solvent: Hydrocarbon; ALS
ΔrH°-26.67 ± 0.06kcal/molChydDolliver, Gresham, et al., 1937gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -26.92 ± 0.06 kcal/mol; At 355 °K; ALS

Hydrogen + Cyclooctene, (Z)- = Cyclooctane

By formula: H2 + C8H14 = C8H16

Quantity Value Units Method Reference Comment
ΔrH°-24.3kcal/molChydDoering, Roth, et al., 1989liquid phase; ALS
ΔrH°-24.5 ± 0.2kcal/molChydRoth and Lennartz, 1980liquid phase; solvent: Cyclohexane; ALS
ΔrH°-23.04 ± 0.17kcal/molChydRogers, Von Voithenberg, et al., 1978liquid phase; solvent: Hexane; ALS
ΔrH°-23.0 ± 0.1kcal/molChydTurner and Meador, 1957liquid phase; solvent: Acetic acid; ALS
ΔrH°-23.28 ± 0.15kcal/molChydConn, Kistiakowsky, et al., 1939gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -23.53 ± 0.04 kcal/mol; At 355 K; ALS

0.5C36H84Cl2P4Rh2 (solution) + Hydrogen (g) = C18H44ClP2Rh (solution)

By formula: 0.5C36H84Cl2P4Rh2 (solution) + H2 (g) = C18H44ClP2Rh (solution)

Quantity Value Units Method Reference Comment
ΔrH°-23.6 ± 0.65kcal/molRSCWang, Rosini, et al., 1995solvent: Benzene; The reaction enthalpy was calculated from the enthalpies of the reactions Rh[P(i-Pr)3]2(Cl)(H)2(solution) + t-BuNC(solution) = Rh[P(i-Pr)3]2(Cl)(CN-t-Bu)(solution) + H2(g), -9.89 ± 0.41 kcal/mol, and 0.5{Rh[P(i-Pr)3]2(Cl)}2(solution) + t-BuNC(solution) = Rh[P(i-Pr)3]2(Cl)(CN-t-Bu)(solution), -33.51 ± 0.50 kcal/mol Wang, Rosini, et al., 1995. The enthalpy of solution of {Rh[P(i-Pr)3]2(Cl)}2(cr) was measured as 4.80 ± 0.31 kcal/mol Wang, Rosini, et al., 1995.; MS

Hydrogen + Cyclopentene, 1-methyl- = Cyclopentane, methyl-

By formula: H2 + C6H10 = C6H12

Quantity Value Units Method Reference Comment
ΔrH°-24.09 ± 0.15kcal/molChydRogers, Crooks, et al., 1987liquid phase; ALS
ΔrH°-24.22 ± 0.12kcal/molChydAllinger, Dodziuk, et al., 1982liquid phase; solvent: Hexane; ALS
ΔrH°-23.01 ± 0.04kcal/molChydTurner and Garner, 1958liquid phase; solvent: Acetic acid; ALS
ΔrH°-23.01 ± 0.04kcal/molChydTurner and Garner, 1957liquid phase; solvent: Acetic acid; ALS
ΔrH°-23.01 ± 0.04kcal/molChydTurner and Garner, 1957, 2liquid phase; solvent: Acetic acid; ALS

2Hydrogen + 1,5-Hexadiene = n-Hexane

By formula: 2H2 + C6H10 = C6H14

Quantity Value Units Method Reference Comment
ΔrH°-60.3 ± 0.4kcal/molChydFang and Rogers, 1992liquid phase; solvent: Cyclohexane; ALS
ΔrH°-60.69 ± 0.65kcal/molChydMolnar, Rachford, et al., 1984liquid phase; solvent: Dioxane; ALS
ΔrH°-60.17 ± 0.37kcal/molChydTurner, Mallon, et al., 1973liquid phase; solvent: Glacial acetic acid; ALS
ΔrH°-60.03 ± 0.10kcal/molChydKistiakowsky, Ruhoff, et al., 1936gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -60.53 ± 0.15 kcal/mol; At 355 °K; ALS

Hydrogen + 1-Ethylcyclopentene = Cyclopentane, ethyl-

By formula: H2 + C7H12 = C7H14

Quantity Value Units Method Reference Comment
ΔrH°-24.36 ± 0.15kcal/molChydAllinger, Dodziuk, et al., 1982liquid phase; solvent: Hexane; ALS
ΔrH°-23.5 ± 0.2kcal/molChydRogers and McLafferty, 1971liquid phase; solvent: Hydrocarbon; ALS
ΔrH°-23.56 ± 0.11kcal/molChydTurner and Garner, 1958liquid phase; solvent: Acetic acid; ALS
ΔrH°-23.56 ± 0.11kcal/molChydTurner and Garner, 1957liquid phase; solvent: Acetic acid; ALS

Hydrogen + Cyclopentane, ethylidene- = Cyclopentane, ethyl-

By formula: H2 + C7H12 = C7H14

Quantity Value Units Method Reference Comment
ΔrH°-25.6 ± 0.1kcal/molChydAllinger, Dodziuk, et al., 1982liquid phase; solvent: Hexane; ALS
ΔrH°-24.2 ± 0.2kcal/molChydRogers and McLafferty, 1971liquid phase; solvent: Hydrocarbon; ALS
ΔrH°-24.88 ± 0.12kcal/molChydTurner and Garner, 1958liquid phase; solvent: Acetic acid; ALS
ΔrH°-24.88 ± 0.12kcal/molChydTurner and Garner, 1957liquid phase; solvent: Acetic acid; ALS

Hydrogen + Cyclopentane, methylene- = Cyclopentane, methyl-

By formula: H2 + C6H10 = C6H12

Quantity Value Units Method Reference Comment
ΔrH°-27.70 ± 0.23kcal/molChydAllinger, Dodziuk, et al., 1982liquid phase; solvent: Hexane; ALS
ΔrH°-26.88 ± 0.02kcal/molChydTurner and Garner, 1958liquid phase; solvent: Acetic acid; ALS
ΔrH°-26.85 ± 0.05kcal/molChydTurner and Garner, 1957liquid phase; solvent: Acetic acid; ALS
ΔrH°-26.82 ± 0.08kcal/molChydTurner and Garner, 1957, 2liquid phase; solvent: Acetic acid; ALS

C3H7+ + Hydrogen = (C3H7+ • Hydrogen)

By formula: C3H7+ + H2 = (C3H7+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°2.5kcal/molPHPMSHiraoka and Kebarle, 1976gas phase; Entropy change calculated or estimated, DG<, ΔrH<; M
Quantity Value Units Method Reference Comment
ΔrS°20.cal/mol*KN/AHiraoka and Kebarle, 1976gas phase; Entropy change calculated or estimated, DG<, ΔrH<; M

Free energy of reaction

ΔrG° (kcal/mol) T (K) Method Reference Comment
0.9170.PHPMSHiraoka and Kebarle, 1976gas phase; Entropy change calculated or estimated, DG<, ΔrH<; M

Cobalt ion (1+) + Hydrogen = (Cobalt ion (1+) • Hydrogen)

By formula: Co+ + H2 = (Co+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°20. ± 1.kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(O K)=18.2 kcal/mol, ΔrS(300 K)=20.6 cal/mol*K; M
Quantity Value Units Method Reference Comment
ΔrS°22.0cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(O K)=18.2 kcal/mol, ΔrS(300 K)=20.6 cal/mol*K; M

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
17.5 (+2.3,-0.) CIDHaynes and Armentrout, 1996gas phase; guided ion beam CID; M

1-Pentene + Hydrogen = Pentane

By formula: C5H10 + H2 = C5H12

Quantity Value Units Method Reference Comment
ΔrH°-30.27 ± 0.58kcal/molChydMolnar, Rachford, et al., 1984liquid phase; solvent: Dioxane; ALS
ΔrH°-29.87 ± 0.42kcal/molChydMolnar, Rachford, et al., 1984liquid phase; solvent: Hexane; ALS
ΔrH°-29.30 ± 0.57kcal/molChydRogers and Skanupong, 1974liquid phase; solvent: Hexane; ALS
ΔrH°-28.5 ± 0.3kcal/molChydRogers and McLafferty, 1971liquid phase; solvent: Hydrocarbon; ALS

Cyclohexane, methylene- + Hydrogen = Cyclohexane, methyl-

By formula: C7H12 + H2 = C7H14

Quantity Value Units Method Reference Comment
ΔrH°-28.56 ± 0.16kcal/molChydRogers, Crooks, et al., 1987liquid phase; ALS
ΔrH°-27.75 ± 0.13kcal/molChydTurner and Garner, 1958liquid phase; solvent: Acetic acid; ALS
ΔrH°-27.75 ± 0.13kcal/molEqkTurner and Garner, 1957liquid phase; solvent: Acetic acid; ALS
ΔrH°-28.70 ± 0.07kcal/molChydTurner and Garner, 1957, 2liquid phase; solvent: Acetic acid; ALS

Hydrogen + Cycloheptene = Cycloheptane

By formula: H2 + C7H12 = C7H14

Quantity Value Units Method Reference Comment
ΔrH°-26.4 ± 0.1kcal/molChydRoth and Lennartz, 1980liquid phase; solvent: Cyclohexane; ALS
ΔrH°-25.85 ± 0.09kcal/molChydTurner, Meador, et al., 1957liquid phase; solvent: Acetic acid; ALS
ΔrH°-26.02 ± 0.15kcal/molChydConn, Kistiakowsky, et al., 1939gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -26.52 ± 0.02 kcal/mol; At 355 K; ALS

3Hydrogen + 1,3,5-Cycloheptatriene = Cycloheptane

By formula: 3H2 + C7H8 = C7H14

Quantity Value Units Method Reference Comment
ΔrH°-72.8 ± 0.1kcal/molChydRoth, Klaerner, et al., 1983liquid phase; solvent: Isooctane; ALS
ΔrH°-70.49 ± 0.39kcal/molChydTurner, Meador, et al., 1957liquid phase; solvent: Acetic acid; ALS
ΔrH°-72.11 ± 0.30kcal/molChydConn, Kistiakowsky, et al., 1939gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -72.85 ± 0.01 kcal/mol; at 355 K; ALS

2Hydrogen + 1,3-Butadiene, 2,3-dimethyl- = Butane, 2,3-dimethyl-

By formula: 2H2 + C6H10 = C6H14

Quantity Value Units Method Reference Comment
ΔrH°-55.31 ± 0.72kcal/molChydMolnar, Rachford, et al., 1984liquid phase; solvent: Dioxane; ALS
ΔrH°-54.26 ± 0.67kcal/molChydMolnar, Rachford, et al., 1984liquid phase; solvent: Hexane; ALS
ΔrH°-53.39 ± 0.15kcal/molChydDolliver, Gresham, et al., 1937gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -53.87 ± 0.15 kcal/mol; At 355 °K; ALS

Pyridine + 3Hydrogen = Piperidine

By formula: C5H5N + 3H2 = C5H11N

Quantity Value Units Method Reference Comment
ΔrH°-46.31 ± 0.18kcal/molEqkHales and Herington, 1957gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -48.32 ± 0.18 kcal/mol; At 400-550 K; ALS
ΔrH°-46.12 ± 0.50kcal/molEqkBurrows and King, 1935liquid phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -45.00 kcal/mol; At 423-443 K; ALS

1-Pentene, 2,4,4-trimethyl- + Hydrogen = Pentane, 2,2,4-trimethyl-

By formula: C8H16 + H2 = C8H18

Quantity Value Units Method Reference Comment
ΔrH°-25.5kcal/molChydTurner, Nettleton, et al., 1958liquid phase; solvent: Acetic acid; ALS
ΔrH°-26.99 ± 0.06kcal/molChydDolliver, Gresham, et al., 1937gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -27.24 ± 0.06 kcal/mol; At 355 °K; ALS
ΔrH°-28.58 ± 0.80kcal/molChydCrawford and Parks, 1936liquid phase; ALS

Propene + Hydrogen = Propane

By formula: C3H6 + H2 = C3H8

Quantity Value Units Method Reference Comment
ΔrH°-29.5 ± 1.2kcal/molChydKistiakowsky and Nickle, 1951gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -29.85 ± 0.50 kcal/mol; ALS
ΔrH°-29.87 ± 0.10kcal/molChydKistiakowsky, Ruhoff, et al., 1935gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -30.115 ± 0.013 kcal/mol; At 355 °K; ALS

(Cobalt ion (1+) • Methane) + Hydrogen = (Cobalt ion (1+) • Hydrogen • Methane)

By formula: (Co+ • CH4) + H2 = (Co+ • H2 • CH4)

Quantity Value Units Method Reference Comment
ΔrS°22.9cal/mol*KSIDTKemper, Bushnell, et al., 1993, 2gas phase; switching reaction(Co+).2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993; M

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
17.4 (+0.8,-0.) SIDTKemper, Bushnell, et al., 1993, 2gas phase; switching reaction(Co+).2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993; M

Hydrogen + Acetone = Isopropyl Alcohol

By formula: H2 + C3H6O = C3H8O

Quantity Value Units Method Reference Comment
ΔrH°-16.43 ± 0.10kcal/molCmWiberg, Crocker, et al., 1991liquid phase; ALS
ΔrH°-13.20kcal/molEqkBuckley and Herington, 1965gas phase; ALS
ΔrH°-13.24 ± 0.10kcal/molChydDolliver, Gresham, et al., 1938gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -13.4 ± 0.1 kcal/mol; At 355 °K; ALS

(Cobalt ion (1+) • Hydrogen) + Methane = (Cobalt ion (1+) • Methane • Hydrogen)

By formula: (Co+ • H2) + CH4 = (Co+ • CH4 • H2)

Quantity Value Units Method Reference Comment
ΔrS°21.8cal/mol*KSIDTKemper, Bushnell, et al., 1993, 2gas phase; switching reaction(Co+)2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993; M

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
22.6 (+1.2,-0.) SIDTKemper, Bushnell, et al., 1993, 2gas phase; switching reaction(Co+)2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993; M

Cyclohexane, ethylidene- + Hydrogen = Cyclohexane, ethyl-

By formula: C8H14 + H2 = C8H16

Quantity Value Units Method Reference Comment
ΔrH°-26.2 ± 0.3kcal/molChydRogers and McLafferty, 1971liquid phase; solvent: Hydrocarbon; ALS
ΔrH°-26.32 ± 0.04kcal/molChydTurner and Garner, 1958liquid phase; solvent: Acetic acid; ALS
ΔrH°-26.32 ± 0.04kcal/molChydTurner and Garner, 1957liquid phase; solvent: Acetic acid; ALS

Hydrogen + trans-Cyclooctene = Cyclooctane

By formula: H2 + C8H14 = C8H16

Quantity Value Units Method Reference Comment
ΔrH°-34.5 ± 0.1kcal/molChydRoth, Adamczak, et al., 1991liquid phase; see Doering, Roth, et al., 1989; ALS
ΔrH°-34.41 ± 0.43kcal/molChydRogers, Von Voithenberg, et al., 1978liquid phase; solvent: Hexane; ALS
ΔrH°-32.24 ± 0.21kcal/molChydTurner and Meador, 1957liquid phase; solvent: Acetic acid; ALS

(Cobalt ion (1+) • Hydrogen) + Hydrogen = (Cobalt ion (1+) • 2Hydrogen)

By formula: (Co+ • H2) + H2 = (Co+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°18.0 ± 0.6kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=17.0 kcal/mol, ΔrS(300 K)=24.5 cal/mol*K; M
Quantity Value Units Method Reference Comment
ΔrS°24.5cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=17.0 kcal/mol, ΔrS(300 K)=24.5 cal/mol*K; M

(Cobalt ion (1+) • 2Hydrogen) + Hydrogen = (Cobalt ion (1+) • 3Hydrogen)

By formula: (Co+ • 2H2) + H2 = (Co+ • 3H2)

Quantity Value Units Method Reference Comment
ΔrH°10.6 ± 0.4kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=9.6 kcal/mol, ΔrS(300 K)=20.5 cal/mol*K; M
Quantity Value Units Method Reference Comment
ΔrS°20.5cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=9.6 kcal/mol, ΔrS(300 K)=20.5 cal/mol*K; M

(Cobalt ion (1+) • 3Hydrogen) + Hydrogen = (Cobalt ion (1+) • 4Hydrogen)

By formula: (Co+ • 3H2) + H2 = (Co+ • 4H2)

Quantity Value Units Method Reference Comment
ΔrH°10.4 ± 0.6kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=9.6 kcal/mol, ΔrS(300 K)=25.2 cal/mol*K; M
Quantity Value Units Method Reference Comment
ΔrS°24.2cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=9.6 kcal/mol, ΔrS(300 K)=25.2 cal/mol*K; M

(Cobalt ion (1+) • 4Hydrogen) + Hydrogen = (Cobalt ion (1+) • 5Hydrogen)

By formula: (Co+ • 4H2) + H2 = (Co+ • 5H2)

Quantity Value Units Method Reference Comment
ΔrH°5.2 ± 0.6kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=4.3 kcal/mol, ΔrS(300 K)=21.9 cal/mol*K; M
Quantity Value Units Method Reference Comment
ΔrS°22.5cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=4.3 kcal/mol, ΔrS(300 K)=21.9 cal/mol*K; M

(Cobalt ion (1+) • 5Hydrogen) + Hydrogen = (Cobalt ion (1+) • 6Hydrogen)

By formula: (Co+ • 5H2) + H2 = (Co+ • 6H2)

Quantity Value Units Method Reference Comment
ΔrH°4.7 ± 0.6kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=4.0 kcal/mol, ΔrS(300 K)=23.8 cal/mol*K; M
Quantity Value Units Method Reference Comment
ΔrS°23.7cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=4.0 kcal/mol, ΔrS(300 K)=23.8 cal/mol*K; M

(Cobalt ion (1+) • 6Hydrogen) + Hydrogen = (Cobalt ion (1+) • 7Hydrogen)

By formula: (Co+ • 6H2) + H2 = (Co+ • 7H2)

Quantity Value Units Method Reference Comment
ΔrH°1.5 ± 0.7kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=0.8 kcal/mol; ΔrS(300 K)=18.0 cal/mol*K; M
Quantity Value Units Method Reference Comment
ΔrS°18.0cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=0.8 kcal/mol; ΔrS(300 K)=18.0 cal/mol*K; M

(H3+ • 3Hydrogen) + Hydrogen = (H3+ • 4Hydrogen)

By formula: (H3+ • 3H2) + H2 = (H3+ • 4H2)

Quantity Value Units Method Reference Comment
ΔrH°1.7 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase; M
ΔrH°2.4kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°17.9cal/mol*KPHPMSHiraoka, 1987gas phase; M
ΔrS°19.3cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M

(H3+ • 2Hydrogen) + Hydrogen = (H3+ • 3Hydrogen)

By formula: (H3+ • 2H2) + H2 = (H3+ • 3H2)

Quantity Value Units Method Reference Comment
ΔrH°3.2 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase; M
ΔrH°3.8kcal/molPHPMSHiraoka and Kebarle, 1975gas phase; M
Quantity Value Units Method Reference Comment
ΔrS°18.5cal/mol*KPHPMSHiraoka, 1987gas phase; M
ΔrS°20.2cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase; M

Hydrogen + 4-Octene, (Z)- = Octane

By formula: H2 + C8H16 = C8H18

Quantity Value Units Method Reference Comment
ΔrH°-28.25 ± 0.1kcal/molChydRogers, Dejroongruang, et al., 1992liquid phase; solvent: Cyclohexane; ALS
ΔrH°-28.62 ± 0.52kcal/molChydRogers and Siddiqui, 1975liquid phase; solvent: n-Hexane; ALS
ΔrH°-27.39 ± 0.14kcal/molChydTurner, Jarrett, et al., 1973liquid phase; solvent: Acetic acid; ALS

2Hydrogen + 4-Octyne = Octane

By formula: 2H2 + C8H14 = C8H18

Quantity Value Units Method Reference Comment
ΔrH°-64.22 ± 0.26kcal/molChydRogers, Dagdagan, et al., 1979liquid phase; solvent: Hexane; ALS
ΔrH°-62.80 ± 0.16kcal/molChydTurner, Jarrett, et al., 1973liquid phase; solvent: Acetic acid; ALS
ΔrH°-62.8kcal/molChydSicher, Svoboda, et al., 1966liquid phase; solvent: Acetic acid; ALS

Hydrogen + Cyclooctanone = Cyclooctyl alcohol

By formula: H2 + C8H14O = C8H16O

Quantity Value Units Method Reference Comment
ΔrH°-13.32kcal/molChydWiberg, Crocker, et al., 1991liquid phase; ALS
ΔrH°-12.70kcal/molChydWiberg, Crocker, et al., 1991solid phase; ALS
ΔrH°-9.31kcal/molChydWiberg, Crocker, et al., 1991gas phase; ALS
ΔrH°-12.70 ± 0.14kcal/molCmWiberg, Crocker, et al., 1991solid phase; ALS

Hydrogen + Cyclohexene, 1-methyl- = Cyclohexane, methyl-

By formula: H2 + C7H12 = C7H14

Quantity Value Units Method Reference Comment
ΔrH°-26.63 ± 0.088kcal/molChydRogers, Crooks, et al., 1987liquid phase; ALS
ΔrH°-25.41 ± 0.11kcal/molChydTurner and Garner, 1958liquid phase; solvent: Acetic acid; ALS
ΔrH°-25.41 ± 0.11kcal/molChydTurner and Garner, 1957liquid phase; solvent: Acetic acid; ALS

2Hydrogen + 1,3-Cycloheptadiene = Cycloheptane

By formula: 2H2 + C7H10 = C7H14

Quantity Value Units Method Reference Comment
ΔrH°-49.92 ± 0.08kcal/molChydTurner, Mallon, et al., 1973liquid phase; solvent: Glacial acetic acid; ALS
ΔrH°-50.77 ± 0.15kcal/molChydConn, Kistiakowsky, et al., 1939gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -51.26 ± 0.05 kcal/mol; At 355 K; ALS

Hydrogen + 2-Norbornene = Norbornane

By formula: H2 + C7H10 = C7H12

Quantity Value Units Method Reference Comment
ΔrH°-32.8 ± 0.1kcal/molChydDoering, Roth, et al., 1988gas phase; ALS
ΔrH°-33.82 ± 0.28kcal/molChydRogers, Choi, et al., 1980liquid phase; solvent: Hexane; Author was aware that data differs from previously reported values; ALS
ΔrH°-33.13 ± 0.21kcal/molChydTurner, Meador, et al., 1957liquid phase; solvent: Acetic acid; ALS

Propanal + Hydrogen = 1-Propanol

By formula: C3H6O + H2 = C3H8O

Quantity Value Units Method Reference Comment
ΔrH°-20.14 ± 0.09kcal/molCmWiberg, Crocker, et al., 1991liquid phase; solvent: Triglyme; Heat of hydrogenation; ALS
ΔrH°-16.62 ± 0.18kcal/molEqkConnett, 1972gas phase; At 473-524 K; ALS
ΔrH°-15.72 ± 0.16kcal/molChydBuckley and Cox, 1967gas phase; ALS

2Hydrogen + 1,3-Cyclohexadiene = Cyclohexane

By formula: 2H2 + C6H8 = C6H12

Quantity Value Units Method Reference Comment
ΔrH°-53.64 ± 0.29kcal/molChydTurner, Mallon, et al., 1973liquid phase; solvent: Glacial acetic acid; ALS
ΔrH°-54.88 ± 0.10kcal/molChydKistiakowsky, Ruhoff, et al., 1936gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -55.4 ± 0.1 kcal/mol; At 355 °K; ALS

Dimanganese decacarbonyl (solution) + Hydrogen (solution) = 2Hydromanganese pentacarbonyl (solution)

By formula: C10Mn2O10 (solution) + H2 (solution) = 2C5HMnO5 (solution)

Quantity Value Units Method Reference Comment
ΔrH°8.70 ± 0.31kcal/molEqSKlingler R.J. and Rathke, 1992solvent: Supercritical carbon dioxide; Temperature range: 373-463 K; MS

Henry's Law data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Rolf Sander

Henry's Law constant (water solution)

kH(T) = k°H exp(d(ln(kH))/d(1/T) ((1/T) - 1/(298.15 K)))
k°H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(kH))/d(1/T) = Temperature dependence constant (K)

k°H (mol/(kg*bar)) d(ln(kH))/d(1/T) (K) Method Reference Comment
0.00078500.LN/A 
0.00078640.QN/AOnly the tabulated data between T = 273. K and T = 303. K from missing citation was used to derive kH and -Δ kH/R. Above T = 303. K the tabulated data could not be parameterized by equation (reference missing) very well. The partial pressure of water vapor (needed to convert some Henry's law constants) was calculated using the formula given by missing citation. The quantities A and α from missing citation were assumed to be identical.
0.00078490.LN/A 
0.00078 RN/A 

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Ion clustering data, Mass spectrum (electron ionization), References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to H2+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)15.42593 ± 0.00005eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)100.9kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity94.34kcal/molN/AHunter and Lias, 1998HL

Ionization energy determinations

IE (eV) Method Reference Comment
15.425927EVALShiner, Gilligan, et al., 1993T = 0K; LL
15.425930EVALShiner, Gilligan, et al., 1993T = 0K; LL
15.425932 ± 0.000002SMcCormack, Gilligan, et al., 1989T = 0K; LL
15.429558 ± 0.00001LSGlab and Hessler, 1987T = 0K; LBLHLM
15.433174 ± 0.00001LSGlab and Hessler, 1987T = 0K; LBLHLM
15.425942 ± 0.00001LSGlab and Hessler, 1987T = 0K; LBLHLM
15.425932SEyler, Short, et al., 1986T = 0K; LBLHLM
15.425929SEyler, Short, et al., 1986T = 0K; LBLHLM
15.425930 ± 0.000027N/AEyler, Short, et al., 1986LBLHLM
15.5 ± 1.0SFarber, Srivastava, et al., 1982LBLHLM
15.98PEKimura, Katsumata, et al., 1981LLK
15.43PEBieri, Schmelzer, et al., 1980LLK
15.42589EVALHuber and Herzberg, 1979LLK
16. ± 1.EIFarber and Srivastava, 1977LLK
15.4PIRabalais, Debies, et al., 1974LLK
15.43PELee and Rabalais, 1974LLK
15.42589 ± 0.00005SHerzberg and Jungen, 1972LLK
15.4256 ± 0.0001STakezawa, 1970RDSH
15.38186 ± 0.00031PEAsbrink, 1970RDSH
15.44 ± 0.01EILossing and Semeluk, 1969RDSH
15.4256SHerzberg, 1969RDSH
15.431 ± 0.022TEVillarejo, 1968RDSH
15.439 ± 0.015PECollin and Natalis, 1968RDSH
15.43CICermak, 1968RDSH
15.37 ± 0.05EIKerwin, Marmet, et al., 1963RDSH
15.4269 ± 0.0016SBeutler and Junger, 1936RDSH

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
H+18.078 ± 0.003HPIPECOWeitzel, Mahnert, et al., 1994T = 0K; LL
H+18.0 ± 0.2HEICrowe and McConkey, 1973LLK
H+17.28 ± 0.16H-EILocht and Momigny, 1971LLK
H+17.3H-EICurran, LaboratoriesRDSH

De-protonation reactions

Hydrogen anion + Hydrogen cation = Hydrogen

By formula: H- + H+ = H2

Quantity Value Units Method Reference Comment
ΔrH°400.40kcal/molN/AShiell, Hu, et al., 2000gas phase; Given: 139714.8±1 cm-1 at 0K, or 399.465±0.003 kcal/mol; B
ΔrH°400.40kcal/molN/APratt, McCormack, et al., 1992gas phase; 399.46±0.01 kcal/mol at 0K; 0.94 correction, Gurvich, Veyts, et al.; B
ΔrH°400.40kcal/molD-EALykke, Murray, et al., 1991gas phase; Reported: 6082.99±0.15 cm-1, or 0.754195(18) eV; B
Quantity Value Units Method Reference Comment
ΔrG°394.20 ± 0.10kcal/molH-TSShiell, Hu, et al., 2000gas phase; Given: 139714.8±1 cm-1 at 0K, or 399.465±0.003 kcal/mol; B
ΔrG°394.20kcal/molH-TSLykke, Murray, et al., 1991gas phase; Reported: 6082.99±0.15 cm-1, or 0.754195(18) eV; B

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Mass spectrum (electron ionization), References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

Ar+ + Hydrogen = (Ar+ • Hydrogen)

By formula: Ar+ + H2 = (Ar+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°22.4kcal/molFAShul, Passarella, et al., 1987gas phase; switching reaction(Ar+)Ar, ΔrH>; Dehmer and Pratt, 1982

Formyl cation + Hydrogen = (Formyl cation • Hydrogen)

By formula: CHO+ + H2 = (CHO+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°3.9kcal/molPHPMSHiraoka and Kebarle, 1975, 2gas phase
Quantity Value Units Method Reference Comment
ΔrS°20.5cal/mol*KPHPMSHiraoka and Kebarle, 1975, 2gas phase

CH5+ + Hydrogen = (CH5+ • Hydrogen)

By formula: CH5+ + H2 = (CH5+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°1.88 ± 0.10kcal/molPHPMSHiraoka, Kudaka, et al., 1991gas phase
Quantity Value Units Method Reference Comment
ΔrS°12.1cal/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase

(CH5+ • Hydrogen) + Hydrogen = (CH5+ • 2Hydrogen)

By formula: (CH5+ • H2) + H2 = (CH5+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°1.78 ± 0.10kcal/molPHPMSHiraoka, Kudaka, et al., 1991gas phase
Quantity Value Units Method Reference Comment
ΔrS°16.2cal/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase

(CH5+ • 2Hydrogen) + Hydrogen = (CH5+ • 3Hydrogen)

By formula: (CH5+ • 2H2) + H2 = (CH5+ • 3H2)

Quantity Value Units Method Reference Comment
ΔrH°1.61 ± 0.10kcal/molPHPMSHiraoka, Kudaka, et al., 1991gas phase
Quantity Value Units Method Reference Comment
ΔrS°22.6cal/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase

(CH5+ • 3Hydrogen) + Hydrogen = (CH5+ • 4Hydrogen)

By formula: (CH5+ • 3H2) + H2 = (CH5+ • 4H2)

Quantity Value Units Method Reference Comment
ΔrH°1.57 ± 0.10kcal/molPHPMSHiraoka, Kudaka, et al., 1991gas phase
Quantity Value Units Method Reference Comment
ΔrS°25.7cal/mol*KPHPMSHiraoka, Kudaka, et al., 1991gas phase

C3H7+ + Hydrogen = (C3H7+ • Hydrogen)

By formula: C3H7+ + H2 = (C3H7+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°2.5kcal/molPHPMSHiraoka and Kebarle, 1976gas phase; Entropy change calculated or estimated, DG<, ΔrH<
Quantity Value Units Method Reference Comment
ΔrS°20.cal/mol*KN/AHiraoka and Kebarle, 1976gas phase; Entropy change calculated or estimated, DG<, ΔrH<

Free energy of reaction

ΔrG° (kcal/mol) T (K) Method Reference Comment
0.9170.PHPMSHiraoka and Kebarle, 1976gas phase; Entropy change calculated or estimated, DG<, ΔrH<

(Cobalt ion (1+) • Methane) + Hydrogen = (Cobalt ion (1+) • Hydrogen • Methane)

By formula: (Co+ • CH4) + H2 = (Co+ • H2 • CH4)

Quantity Value Units Method Reference Comment
ΔrS°22.9cal/mol*KSIDTKemper, Bushnell, et al., 1993, 2gas phase; switching reaction(Co+).2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
17.4 (+0.8,-0.) SIDTKemper, Bushnell, et al., 1993, 2gas phase; switching reaction(Co+).2H2, ΔrS(440 K); Kemper, Bushnell, et al., 1993

(Cobalt ion (1+) • Water) + Hydrogen = (Cobalt ion (1+) • Hydrogen • Water)

By formula: (Co+ • H2O) + H2 = (Co+ • H2 • H2O)

Quantity Value Units Method Reference Comment
ΔrS°24.7cal/mol*KSIDTKemper, Bushnell, et al., 1993, 2gas phase; ΔrS(530 K)

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
19.8 (+0.6,-0.) SIDTKemper, Bushnell, et al., 1993, 2gas phase; ΔrS(530 K)

Cobalt ion (1+) + Hydrogen = (Cobalt ion (1+) • Hydrogen)

By formula: Co+ + H2 = (Co+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°20. ± 1.kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(O K)=18.2 kcal/mol, ΔrS(300 K)=20.6 cal/mol*K
Quantity Value Units Method Reference Comment
ΔrS°22.0cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(O K)=18.2 kcal/mol, ΔrS(300 K)=20.6 cal/mol*K

Enthalpy of reaction

ΔrH° (kcal/mol) T (K) Method Reference Comment
17.5 (+2.3,-0.) CIDHaynes and Armentrout, 1996gas phase; guided ion beam CID

(Cobalt ion (1+) • Hydrogen) + Hydrogen = (Cobalt ion (1+) • 2Hydrogen)

By formula: (Co+ • H2) + H2 = (Co+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°18.0 ± 0.6kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=17.0 kcal/mol, ΔrS(300 K)=24.5 cal/mol*K
Quantity Value Units Method Reference Comment
ΔrS°24.5cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=17.0 kcal/mol, ΔrS(300 K)=24.5 cal/mol*K

(Cobalt ion (1+) • 2Hydrogen) + Hydrogen = (Cobalt ion (1+) • 3Hydrogen)

By formula: (Co+ • 2H2) + H2 = (Co+ • 3H2)

Quantity Value Units Method Reference Comment
ΔrH°10.6 ± 0.4kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=9.6 kcal/mol, ΔrS(300 K)=20.5 cal/mol*K
Quantity Value Units Method Reference Comment
ΔrS°20.5cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=9.6 kcal/mol, ΔrS(300 K)=20.5 cal/mol*K

(Cobalt ion (1+) • 3Hydrogen) + Hydrogen = (Cobalt ion (1+) • 4Hydrogen)

By formula: (Co+ • 3H2) + H2 = (Co+ • 4H2)

Quantity Value Units Method Reference Comment
ΔrH°10.4 ± 0.6kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=9.6 kcal/mol, ΔrS(300 K)=25.2 cal/mol*K
Quantity Value Units Method Reference Comment
ΔrS°24.2cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=9.6 kcal/mol, ΔrS(300 K)=25.2 cal/mol*K

(Cobalt ion (1+) • 4Hydrogen) + Hydrogen = (Cobalt ion (1+) • 5Hydrogen)

By formula: (Co+ • 4H2) + H2 = (Co+ • 5H2)

Quantity Value Units Method Reference Comment
ΔrH°5.2 ± 0.6kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=4.3 kcal/mol, ΔrS(300 K)=21.9 cal/mol*K
Quantity Value Units Method Reference Comment
ΔrS°22.5cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=4.3 kcal/mol, ΔrS(300 K)=21.9 cal/mol*K

(Cobalt ion (1+) • 5Hydrogen) + Hydrogen = (Cobalt ion (1+) • 6Hydrogen)

By formula: (Co+ • 5H2) + H2 = (Co+ • 6H2)

Quantity Value Units Method Reference Comment
ΔrH°4.7 ± 0.6kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=4.0 kcal/mol, ΔrS(300 K)=23.8 cal/mol*K
Quantity Value Units Method Reference Comment
ΔrS°23.7cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=4.0 kcal/mol, ΔrS(300 K)=23.8 cal/mol*K

(Cobalt ion (1+) • 6Hydrogen) + Hydrogen = (Cobalt ion (1+) • 7Hydrogen)

By formula: (Co+ • 6H2) + H2 = (Co+ • 7H2)

Quantity Value Units Method Reference Comment
ΔrH°1.5 ± 0.7kcal/molSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=0.8 kcal/mol; ΔrS(300 K)=18.0 cal/mol*K
Quantity Value Units Method Reference Comment
ΔrS°18.0cal/mol*KSIDTKemper, Bushnell, et al., 1993gas phase; ΔrH(0 K)=0.8 kcal/mol; ΔrS(300 K)=18.0 cal/mol*K

Iron ion (1+) + Hydrogen = (Iron ion (1+) • Hydrogen)

By formula: Fe+ + H2 = (Fe+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°12.5 ± 0.2kcal/molSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 10.8 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°21.5cal/mol*KSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 10.8 kcal/mol

(Iron ion (1+) • Hydrogen) + Hydrogen = (Iron ion (1+) • 2Hydrogen)

By formula: (Fe+ • H2) + H2 = (Fe+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°17.0 ± 0.2kcal/molSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 15.7 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°25.2cal/mol*KSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 15.7 kcal/mol

(Iron ion (1+) • 2Hydrogen) + Hydrogen = (Iron ion (1+) • 3Hydrogen)

By formula: (Fe+ • 2H2) + H2 = (Fe+ • 3H2)

Quantity Value Units Method Reference Comment
ΔrH°8.4 ± 0.1kcal/molSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 7.5 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°19.1cal/mol*KSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 7.5 kcal/mol

(Iron ion (1+) • 3Hydrogen) + Hydrogen = (Iron ion (1+) • 4Hydrogen)

By formula: (Fe+ • 3H2) + H2 = (Fe+ • 4H2)

Quantity Value Units Method Reference Comment
ΔrH°9.7 ± 0.1kcal/molSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 8.6 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°24.9cal/mol*KSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 8.6 kcal/mol

(Iron ion (1+) • 4Hydrogen) + Hydrogen = (Iron ion (1+) • 5Hydrogen)

By formula: (Fe+ • 4H2) + H2 = (Fe+ • 5H2)

Quantity Value Units Method Reference Comment
ΔrH°2.6 ± 0.1kcal/molSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 2.2 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°17.9cal/mol*KSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 2.2 kcal/mol

(Iron ion (1+) • 5Hydrogen) + Hydrogen = (Iron ion (1+) • 6Hydrogen)

By formula: (Fe+ • 5H2) + H2 = (Fe+ • 6H2)

Quantity Value Units Method Reference Comment
ΔrH°2.7 ± 0.1kcal/molSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 2.3 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°18.1cal/mol*KSIDTBushnell, Kemper, et al., 1995gas phase; ΔrH(0K) = 2.3 kcal/mol

HN2+ + Hydrogen = (HN2+ • Hydrogen)

By formula: HN2+ + H2 = (HN2+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°7.2kcal/molPHPMSHiraoka, Saluja, et al., 1979gas phase
Quantity Value Units Method Reference Comment
ΔrS°22.6cal/mol*KPHPMSHiraoka, Saluja, et al., 1979gas phase

(HN2+ • Hydrogen) + Hydrogen = (HN2+ • 2Hydrogen)

By formula: (HN2+ • H2) + H2 = (HN2+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°1.8kcal/molPHPMSHiraoka, Saluja, et al., 1979gas phase
Quantity Value Units Method Reference Comment
ΔrS°17.cal/mol*KPHPMSHiraoka, Saluja, et al., 1979gas phase

Hydroxyl anion + Hydrogen = (Hydroxyl anion • Hydrogen)

By formula: HO- + H2 = (HO- • H2)

Quantity Value Units Method Reference Comment
ΔrH°7.kcal/molCIDPaulson and Henchman, 1984gas phase; approximate value

HO2+ + Hydrogen = (HO2+ • Hydrogen)

By formula: HO2+ + H2 = (HO2+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°12.5kcal/molPHPMSHiraoka, Saluja, et al., 1979gas phase
Quantity Value Units Method Reference Comment
ΔrS°22.cal/mol*KPHPMSHiraoka, Saluja, et al., 1979gas phase

(HO2+ • Oxygen) + Hydrogen = (HO2+ • Hydrogen • Oxygen)

By formula: (HO2+ • O2) + H2 = (HO2+ • H2 • O2)

Quantity Value Units Method Reference Comment
ΔrH°4.0kcal/molPHPMSHiraoka, Saluja, et al., 1979gas phase
Quantity Value Units Method Reference Comment
ΔrS°17.cal/mol*KPHPMSHiraoka, Saluja, et al., 1979gas phase

H3+ + Hydrogen = (H3+ • Hydrogen)

By formula: H3+ + H2 = (H3+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°6.9 ± 0.4kcal/molAVGN/AAverage of 4 out of 11 values; Individual data points
Quantity Value Units Method Reference Comment
ΔrS°17.4 to 17.4cal/mol*KRNGN/ARange of 6 values; Individual data points

(H3+ • Hydrogen) + Hydrogen = (H3+ • 2Hydrogen)

By formula: (H3+ • H2) + H2 = (H3+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°3.3 ± 0.2kcal/molPHPMSHiraoka, 1987gas phase
ΔrH°3.1kcal/molHPMSBeuhler, Ehrenson, et al., 1983gas phase
ΔrH°3.4kcal/molHPMSBeuhler, Ehrenson, et al., 1983gas phase; deuterated
ΔrH°4.1kcal/molPHPMSHiraoka and Kebarle, 1975gas phase
ΔrH°1.8kcal/molHPMSBennett and Field, 1972gas phase; Entropy change is questionable
Quantity Value Units Method Reference Comment
ΔrS°17.4cal/mol*KPHPMSHiraoka, 1987gas phase
ΔrS°16.9cal/mol*KHPMSBeuhler, Ehrenson, et al., 1983gas phase
ΔrS°16.1cal/mol*KHPMSBeuhler, Ehrenson, et al., 1983gas phase; deuterated
ΔrS°19.8cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase
ΔrS°10.8cal/mol*KHPMSBennett and Field, 1972gas phase; Entropy change is questionable

(H3+ • 2Hydrogen) + Hydrogen = (H3+ • 3Hydrogen)

By formula: (H3+ • 2H2) + H2 = (H3+ • 3H2)

Quantity Value Units Method Reference Comment
ΔrH°3.2 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase
ΔrH°3.8kcal/molPHPMSHiraoka and Kebarle, 1975gas phase
Quantity Value Units Method Reference Comment
ΔrS°18.5cal/mol*KPHPMSHiraoka, 1987gas phase
ΔrS°20.2cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase

(H3+ • 3Hydrogen) + Hydrogen = (H3+ • 4Hydrogen)

By formula: (H3+ • 3H2) + H2 = (H3+ • 4H2)

Quantity Value Units Method Reference Comment
ΔrH°1.7 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase
ΔrH°2.4kcal/molPHPMSHiraoka and Kebarle, 1975gas phase
Quantity Value Units Method Reference Comment
ΔrS°17.9cal/mol*KPHPMSHiraoka, 1987gas phase
ΔrS°19.3cal/mol*KPHPMSHiraoka and Kebarle, 1975gas phase

(H3+ • 4Hydrogen) + Hydrogen = (H3+ • 5Hydrogen)

By formula: (H3+ • 4H2) + H2 = (H3+ • 5H2)

Quantity Value Units Method Reference Comment
ΔrH°1.6 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase
Quantity Value Units Method Reference Comment
ΔrS°18.9cal/mol*KPHPMSHiraoka, 1987gas phase

(H3+ • 5Hydrogen) + Hydrogen = (H3+ • 6Hydrogen)

By formula: (H3+ • 5H2) + H2 = (H3+ • 6H2)

Quantity Value Units Method Reference Comment
ΔrH°1.5 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase
Quantity Value Units Method Reference Comment
ΔrS°20.0cal/mol*KPHPMSHiraoka, 1987gas phase

(H3+ • 6Hydrogen) + Hydrogen = (H3+ • 7Hydrogen)

By formula: (H3+ • 6H2) + H2 = (H3+ • 7H2)

Quantity Value Units Method Reference Comment
ΔrH°0.9 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase
Quantity Value Units Method Reference Comment
ΔrS°16.5cal/mol*KPHPMSHiraoka, 1987gas phase

(H3+ • 7Hydrogen) + Hydrogen = (H3+ • 8Hydrogen)

By formula: (H3+ • 7H2) + H2 = (H3+ • 8H2)

Quantity Value Units Method Reference Comment
ΔrH°0.8 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase
Quantity Value Units Method Reference Comment
ΔrS°17.9cal/mol*KPHPMSHiraoka, 1987gas phase

(H3+ • 8Hydrogen) + Hydrogen = (H3+ • 9Hydrogen)

By formula: (H3+ • 8H2) + H2 = (H3+ • 9H2)

Quantity Value Units Method Reference Comment
ΔrH°0.6 ± 0.1kcal/molPHPMSHiraoka, 1987gas phase
Quantity Value Units Method Reference Comment
ΔrS°19.1cal/mol*KPHPMSHiraoka, 1987gas phase

Hydronium cation + Hydrogen = (Hydronium cation • Hydrogen)

By formula: H3O+ + H2 = (H3O+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°3.5 ± 0.5kcal/molSCATTERINGOkumura, Yeh, et al., 1990gas phase

Potassium ion (1+) + Hydrogen = (Potassium ion (1+) • Hydrogen)

By formula: K+ + H2 = (K+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°1.86kcal/molSIDTBushnell, Kemper, et al., 1994gas phase; ΔrH(0K) = 1.45 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°13.5cal/mol*KSIDTBushnell, Kemper, et al., 1994gas phase; ΔrH(0K) = 1.45 kcal/mol

(Potassium ion (1+) • Hydrogen) + Hydrogen = (Potassium ion (1+) • 2Hydrogen)

By formula: (K+ • H2) + H2 = (K+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°1.47kcal/molSIDTBushnell, Kemper, et al., 1994gas phase; ΔrH(0K) = 1.35 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°11.2cal/mol*KSIDTBushnell, Kemper, et al., 1994gas phase; ΔrH(0K) = 1.35 kcal/mol

Lithium ion (1+) + Hydrogen = (Lithium ion (1+) • Hydrogen)

By formula: Li+ + H2 = (Li+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°6.5 ± 4.6kcal/molEIWu, 1979gas phase

Sodium ion (1+) + Hydrogen = (Sodium ion (1+) • Hydrogen)

By formula: Na+ + H2 = (Na+ • H2)

Quantity Value Units Method Reference Comment
ΔrH°2.93kcal/molSIDTBushnell, Kemper, et al., 1994gas phase; ΔrH(0K) = 2.45 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°13.2cal/mol*KSIDTBushnell, Kemper, et al., 1994gas phase; ΔrH(0K) = 2.45 kcal/mol

(Sodium ion (1+) • Hydrogen) + Hydrogen = (Sodium ion (1+) • 2Hydrogen)

By formula: (Na+ • H2) + H2 = (Na+ • 2H2)

Quantity Value Units Method Reference Comment
ΔrH°2.41kcal/molSIDTBushnell, Kemper, et al., 1994gas phase; ΔrH(0K) = 2.25 kcal/mol
Quantity Value Units Method Reference Comment
ΔrS°12.4cal/mol*KSIDTBushnell, Kemper, et al., 1994gas phase; ΔrH(0K) = 2.25 kcal/mol

Mass spectrum (electron ionization)

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

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References

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Mass spectrum (electron ionization), Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

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Roder, Childs, et al., 1973
Roder, H.M.; Childs, G.E.; McCarty, R.D.; Angerhofer, P.E., Survey of the Prop. of the Hydrogen Isotopes Below Their Critical Temp, Natl. Bur. Stand. (U. S.), 1973. [all data]

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Clusius, K.; Weigand, K., Melting Curves of the Gases A, Kr, Xe, CH4, CH3D, CD4, C2H4, C2H6, COS, and PH3 to 200 Atmospheres Pressure. The Chane of Volume on Melting, Z. Phys. Chem., Abt. B, 1940, 46, 1-37. [all data]

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Onnes, H.K.; Crommelin, C.-A.; Cath, P.G., Isothermals of di-atomic substances and their binary mixtures. XIX. A preliminary determination of the critical point of hydrogen., Proc. K. Ned. Akad. Wet., 1917, 20, 178-184. [all data]

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van Itterbeek, A.; Verbeke, O.; Theewes, F.; Staes, K.; de Boelpaep, J., The Difference in Vapour Pressure Between Normal and Equilibrium Hydrogen. Vapour Pressure of Normal Hydrogen Between 20 ºK and 32 ºK, Physica (Amsterdam), 1964, 30, 6, 1238-1244, https://doi.org/10.1016/0031-8914(64)90114-4 . [all data]

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Hiraoka, K., A Determination of the Stabilities of H3+(H2)n with n=1-9 from Measurements of the gas-Phase Ion Equilibria H3+(H2)n-1 + H2 = H3+(H2)n, J. Chem. Phys., 1987, 87, 7, 4048, https://doi.org/10.1063/1.452909 . [all data]

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Beuhler, R.J.; Ehrenson, S.; Friedman, L., Hydrogen Cluster Ion Equilibria, J. Chem. Phys., 1983, 79, 12, 5982, https://doi.org/10.1063/1.445781 . [all data]

Hiraoka and Kebarle, 1975
Hiraoka, K.; Kebarle, P., A Determination of the Stabilities of H5+, H7+, H9+, and H11+ from Measurement of the Gas Phase Ion Equilibria Hn+ + H2 = H(n + 2)+ (n = 3, 5, 7, 9), J. Chem. Phys., 1975, 62, 6, 2267, https://doi.org/10.1063/1.430751 . [all data]

Bennett and Field, 1972
Bennett, S.L.; Field, F.H., Reversible Reactions of Gaseous Ions. VII. The Hydrogen System, J. Am. Chem. Soc., 1972, 94, 25, 8669, https://doi.org/10.1021/ja00780a003 . [all data]

Shiell, Hu, et al., 2000
Shiell, R.C.; Hu, X.K.; Hu, Q.C.J.; Hepburn, J.W., Threshold Ion-pair Production spectroscopy (TIPPS) of H2 and D2, Faraday Disc. Chem. Soc., 2000, 115, 331, https://doi.org/10.1039/a909428h . [all data]

Pratt, McCormack, et al., 1992
Pratt, S.T.; McCormack, E.F.; Dehmer, J.L.; Dehmer, P.M., Field-Induced Ion-Pair Formation in Molecular Hydrogen, Phys. Rev. Lett., 1992, 68, 5, 584, https://doi.org/10.1103/PhysRevLett.68.584 . [all data]

Gurvich, Veyts, et al.
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Allinger, Dodziuk, et al., 1982
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Roth and Lennartz, 1980
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Turner, Jarrett, et al., 1973
Turner, R.B.; Jarrett, A.D.; Goebel, P.; Mallon, B.J., Heats of hydrogenation. 9. Cyclic acetylenes and some miscellaneous olefins, J. Am. Chem. Soc., 1973, 95, 790-792. [all data]

Rogers and McLafferty, 1971
Rogers, D.W.; McLafferty, F.J., A new hydrogen calorimeter. Heats of hydrogenation of allyl and vinyl unsaturation adjacent to a ring, Tetrahedron, 1971, 27, 3765-3775. [all data]

Dolliver, Gresham, et al., 1937
Dolliver, M.a.; Gresham, T.L.; Kistiakowsky, G.B.; Vaughan, W.E., Heats of organic reactions. V. Heats of hydrogenation of various hydrocarbons, J. Am. Chem. Soc., 1937, 59, 831-841. [all data]

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Doering, Roth, et al., 1989
Doering, W.E.; Roth, W.R.; Bauer, F.; Breuckmann, R.; Ebbrecht, T.; Herbold, M.; Schmidt, R.; Lennartz, H-W.; Lenoir, D.; Boese, R., Rotational barriers of strained olefines, Chem. Ber., 1989, 122, 1263-1266. [all data]

Rogers, Von Voithenberg, et al., 1978
Rogers, D.W.; Von Voithenberg, H.; Allinger, N.L., Heats of hydrogenation of the cis and trans isomers of cyclooctene, J. Org. Chem., 1978, 43, 360-361. [all data]

Turner and Meador, 1957
Turner, R.B.; Meador, W.R., Heats of hydrogenation. IV. Hydrogenation of some cis- and trans-cycloolefins, J. Am. Chem. Soc., 1957, 79, 4133-4136. [all data]

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Conn, J.B.; Kistiakowsky, G.B.; Smith, E.A., Heats of organic reactions. VIII. Some further hydrogenations, including those of some acetylenes, J. Am. Chem. Soc., 1939, 61, 1868-1876. [all data]

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Turner, R.B.; Garner, R.H., Heats of hydrogenation. V. Relative stabilities in certain exocyclic-endocyclic olefin pairs, J. Am. Chem. Soc., 1958, 80, 1424-1430. [all data]

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Fang, W.; Rogers, D.W., Enthalpy of hydrogenation of the hexadienes and cis- and trans-1,3,5-hexatriene, J. Org. Chem., 1992, 57, 2294-2297. [all data]

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Molnar, A.; Rachford, R.; Smith, G.V.; Liu, R., Heats of hydrogenation by a simple and rapid flow calorimetric method, Appl. Catal., 1984, 9, 219-223. [all data]

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Turner, R.B.; Mallon, B.J.; Tichy, M.; Doering, W.v.E.; Roth, W.R.; Schroder, G., Heats of hydrogenation. X. Conjugative interaction in cyclic dienes and trienes, J. Am. Chem. Soc., 1973, 95, 8605-8610. [all data]

Kistiakowsky, Ruhoff, et al., 1936
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Hiraoka, K.; Kebarle, P., Stabilities and Energetics of Pentacoordinated Carbonium Ions. The Isomeric C2H7+ Ions and Some Higher Analogues: C3H9+ and C4H11+, J. Am. Chem. Soc., 1976, 98, 20, 6119, https://doi.org/10.1021/ja00436a009 . [all data]

Kemper, Bushnell, et al., 1993
Kemper, P.R.; Bushnell, J.; Von Helden, G.; Bowers, M.T., Co+(H2)n Clusters: Binding Energies and Molecular Parameters, J. Chem Phys., 1993, 97, 1, 52, https://doi.org/10.1021/j100103a012 . [all data]

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Haynes, C.L.; Armentrout, P.B., Guided Ion Beam Determination of the Co+ - H2 Bond Dissociation energy, Chem Phys. Let., 1996, 249, 1-2, 64, https://doi.org/10.1016/0009-2614(95)01337-7 . [all data]

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Notes

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