Iodine

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Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, 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
ΔfH°gas14.92 ± 0.02kcal/molReviewCox, Wagman, et al., 1984CODATA Review value
ΔfH°gas14.92kcal/molReviewChase, 1998Data last reviewed in June, 1982
Quantity Value Units Method Reference Comment
S°gas,1 bar62.306 ± 0.001cal/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
S°gas,1 bar62.306cal/mol*KReviewChase, 1998Data last reviewed in June, 1982

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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Temperature (K) 457.666 to 2000.2000. to 6000.
A 9.03385118.33990
B 0.053884-0.966965
C -0.218106-0.441717
D 0.2473500.052353
E -0.020035-19.69260
F 12.15790-12.87560
G 73.1166167.21479
H 14.9190014.91900
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in June, 1982 Data last reviewed in June, 1982

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, 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
ΔfH°liquid3.231kcal/molReviewChase, 1998Data last reviewed in June, 1982
Quantity Value Units Method Reference Comment
S°liquid,1 bar35.937cal/mol*KReviewChase, 1998Data last reviewed in June, 1982
Quantity Value Units Method Reference Comment
S°solid,1 bar27.758 ± 0.072cal/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
Quantity Value Units Method Reference Comment
S°solid27.758cal/mol*KReviewChase, 1998Data last reviewed in June, 1982

Liquid 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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Temperature (K) 386.75 to 457.666
A 19.28040
B 1.638540×10-8
C -2.085170×10-8
D 8.898500×10-9
E 1.131891×10-10
F -2.516210
G 59.26860
H 3.232080
ReferenceChase, 1998
Comment Data last reviewed in June, 1982

Solid 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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Temperature (K) 298. to 386.75
A -46.78860
B 219.6220
C -257.9450
D 127.7060
E 1.232410
F 10.34880
G -77.07409
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in June, 1982

Phase change data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, References, Notes

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

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
311.9 to 456.3.358581039.159-146.589Stull, 1947Coefficents calculated by NIST from author's data.

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics 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 as indicated in comments:
B - John E. Bartmess
MS - José A. Martinho Simões
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
M - 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. 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

Iodide + Iodine = I3-

By formula: I- + I2 = I3-

Quantity Value Units Method Reference Comment
ΔrH°32.5 ± 2.4kcal/molN/ATaylor, Asmis, et al., 1999gas phase; B
ΔrH°30.1 ± 1.4kcal/molCIDTDo, Klein, et al., 1997gas phase; B
ΔrH°85.10kcal/molTherFinch, Gates, et al., 1977gas phase; This value is far more bound than expected from other studies; B
ΔrH°32.60kcal/molN/ACheck, Faust, et al., 2001gas phase; FeF3-(t); ; ΔS(EA)=2.8; B
Quantity Value Units Method Reference Comment
ΔrG°22.50kcal/molN/ACheck, Faust, et al., 2001gas phase; FeF3-(t); ; ΔS(EA)=2.8; B

Dimanganese decacarbonyl (cr) + Iodine (cr) = 2Manganese, pentacarbonyliodo- (cr)

By formula: C10Mn2O10 (cr) + I2 (cr) = 2C5IMnO5 (cr)

Quantity Value Units Method Reference Comment
ΔrH°-44.2 ± 2.1kcal/molPCHarel and Adamson, 1986The reaction enthalpy was calculated from the enthalpy of the same reaction in cyclohexane, -44.9 ± 2.0 kcal/mol Harel and Adamson, 1986, and from the solution enthalpies of Mn2(CO)10(cr), 8.60 ± 0.50 kcal/mol, I2(cr), 4.90 ± 0.1 kcal/mol, and Mn(CO)5(I)(cr), 6.4 ± 0.1 kcal/mol Harel and Adamson, 1986. The latter value refers to the solution in benzene and is therefore taken as an approximation; MS

Dirhenium decacarbonyl (cr) + Iodine (cr) = 2Rhenium, pentacarbonyliodo- (cr)

By formula: C10O10Re2 (cr) + I2 (cr) = 2C5IO5Re (cr)

Quantity Value Units Method Reference Comment
ΔrH°-41.1 ± 4.3kcal/molPCHarel and Adamson, 1986The reaction enthalpy was calculated from the enthalpy of the same reaction in cyclohexane, -37.6 ± 3.8 kcal/mol, and from the solution enthalpies of Re2(CO)10(cr), 8.20 ± 0.50 kcal/mol, I2(cr), 4.90 ± 0.1 kcal/mol, and Re(CO)5(I)(cr), 8.3 ± 1.0 kcal/mol Harel and Adamson, 1986; MS

Hydrogen iodide + 1-Propene, 3-iodo- = Propene + Iodine

By formula: HI + C3H5I = C3H6 + I2

Quantity Value Units Method Reference Comment
ΔrH°-7.96 ± 0.33kcal/molEqkRodgers, Golden, et al., 1966gas phase; ALS
ΔrH°-9.5 ± 1.0kcal/molEqkRodgers, Golden, et al., 1966gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -8.33 ± 0.23 kcal/mol; At 527 K; ALS

Hydrogen iodide + Methane, iodo- = Methane + Iodine

By formula: HI + CH3I = CH4 + I2

Quantity Value Units Method Reference Comment
ΔrH°-12.56 ± 0.13kcal/molEqkGolden, Walsh, et al., 1965gas phase; ALS
ΔrH°-12.67 ± 0.05kcal/molEqkGoy and Pritchard, 1965gas phase; ALS
ΔrH°-11.0 ± 1.3kcal/molCmNichol and Ubbelohde, 1952gas phase; ALS

C12H16Nb (cr) + 2Iodine (cr) = C10H10I2Nb (cr) + 2Methane, iodo- (l)

By formula: C12H16Nb (cr) + 2I2 (cr) = C10H10I2Nb (cr) + 2CH3I (l)

Quantity Value Units Method Reference Comment
ΔrH°-57.91 ± 0.57kcal/molRSCDiogo, Simoni, et al., 1993The difference between the enthalpies of formation of Nb(Cp)2(I)2 and Nb(Cp)2(Me)2 is calculated as -51.41 ± 0.62 kcal/mol; MS

C20H26CoN5O4 (solution) + Iodine (solution) = C13H19CoIN5O4 (solution) + Benzene, (iodomethyl)- (solution)

By formula: C20H26CoN5O4 (solution) + I2 (solution) = C13H19CoIN5O4 (solution) + C7H7I (solution)

Quantity Value Units Method Reference Comment
ΔrH°-15.1 ± 0.91kcal/molRSCToscano, Seligson, et al., 1989solvent: Bromoform; The enthalpy of solution of Co(py)(dmg)2(Bz)(cr) was measured as 2.70 kcal/mol Toscano, Seligson, et al., 1989; MS

C14H22CoN5O4 (solution) + Iodine (solution) = C13H19CoIN5O4 (solution) + Methane, iodo- (solution)

By formula: C14H22CoN5O4 (solution) + I2 (solution) = C13H19CoIN5O4 (solution) + CH3I (solution)

Quantity Value Units Method Reference Comment
ΔrH°-22.2 ± 0.60kcal/molRSCToscano, Seligson, et al., 1989solvent: Bromoform; The enthalpy of solution of Co(py)(dmg)2(Me)(cr) was measured as 2.61 kcal/mol Toscano, Seligson, et al., 1989; MS

Hydromanganese pentacarbonyl (l) + Iodine (cr) = Hydrogen iodide (g) + Manganese, pentacarbonyliodo- (cr)

By formula: C5HMnO5 (l) + I2 (cr) = HI (g) + C5IMnO5 (cr)

Quantity Value Units Method Reference Comment
ΔrH°-26. ± 2.kcal/molRSCConnor, Zafarani-Moattar, et al., 1982The reaction enthalpy relies on -6. ± 1. kcal/mol for the enthalpy of solution of HI(g) in benzene Connor, Zafarani-Moattar, et al., 1982.; MS

Ethylene + Iodine = Ethane, 1,2-diiodo-

By formula: C2H4 + I2 = C2H4I2

Quantity Value Units Method Reference Comment
ΔrH°-11.5 ± 0.2kcal/molEqkAbrams and Davis, 1954gas phase; ALS
ΔrH°-13.4 ± 0.5kcal/molEqkCutherbertson and Kistiakowsky, 1935gas phase; Heat of dissociation; ALS

Iodine + Chlorotrifluoromethane = Methane, trifluoroiodo- + Iodine monochloride

By formula: I2 + CClF3 = CF3I + ClI

Quantity Value Units Method Reference Comment
ΔrH°17.27 ± 0.26kcal/molEqkLord, Goy, et al., 1967gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = 17.10 ± 0.17 kcal/mol; ALS

Hydrogen iodide + Cyclohexane, iodo- = Cyclohexane + Iodine

By formula: HI + C6H11I = C6H12 + I2

Quantity Value Units Method Reference Comment
ΔrH°-7.8 ± 2.0kcal/molCmBrennan and Ubbelohde, 1956gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -6.8 ± 1.0 kcal/mol; ALS

Ethane, 1,1,1-trifluoro- + Iodine = Hydrogen iodide + 1,1,1-Trifluoro-2-iodoethane

By formula: C2H3F3 + I2 = HI + C2H2F3I

Quantity Value Units Method Reference Comment
ΔrH°-15.3 ± 0.5kcal/molEqkWu and Rodgers, 1974gas phase; Heat of formation Unpublished results by B.J. Zwolinski; ALS

2-Bromo-1,1,1-trifluoroethane + Iodine = 1,1,1-Trifluoro-2-iodoethane + iodine bromide

By formula: C2H2BrF3 + I2 = C2H2F3I + BrI

Quantity Value Units Method Reference Comment
ΔrH°6.6 ± 0.5kcal/molEqkBuckley, Ford, et al., 1980gas phase; GLC;hf298_gas[kcal/mol]=-166.8±1.1; Kolesov and Papina, 1983; ALS

Mercury, dimethyl- (l) + 2Iodine (cr) = 2Methane, iodo- (l) + Mercury diiodide (cr)

By formula: C2H6Hg (l) + 2I2 (cr) = 2CH3I (l) + HgI2 (cr)

Quantity Value Units Method Reference Comment
ΔrH°-44.1 ± 0.2kcal/molRSCHartley, Pritchard, et al., 1950Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

Dirhenium decacarbonyl (solution) + Iodine (solution) = 2Rhenium, pentacarbonyliodo- (solution)

By formula: C10O10Re2 (solution) + I2 (solution) = 2C5IO5Re (solution)

Quantity Value Units Method Reference Comment
ΔrH°-37.6 ± 3.8kcal/molPCHarel and Adamson, 1986solvent: Cyclohexane; Please also see Adamson, Vogler, et al., 1978.; MS

Gallium trimethyl (l) + 3Iodine (cr) = GaI3 (cr) + 3Methane, iodo- (l)

By formula: C3H9Ga (l) + 3I2 (cr) = GaI3 (cr) + 3CH3I (l)

Quantity Value Units Method Reference Comment
ΔrH°-47.8 ± 2.0kcal/molRSCFowell and Mortimer, 1958Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

Gallium trimethyl (l) + 2Iodine (cr) = CH3GaI2 (cr) + 2Methane, iodo- (l)

By formula: C3H9Ga (l) + 2I2 (cr) = CH3GaI2 (cr) + 2CH3I (l)

Quantity Value Units Method Reference Comment
ΔrH°-37.9 ± 1.0kcal/molRSCFowell and Mortimer, 1958Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

Hexamethylditin (l) + Iodine (cr) = 2C3H9ISn (l)

By formula: C6H18Sn2 (l) + I2 (cr) = 2C3H9ISn (l)

Quantity Value Units Method Reference Comment
ΔrH°-44.00 ± 0.69kcal/molRSCPedley, Skinner, et al., 1957Please also see Pedley and Rylance, 1977 and Cox and Pilcher, 1970, 2.; MS

1,2-Diiodobutane = 1-Butene + Iodine

By formula: C4H8I2 = C4H8 + I2

Quantity Value Units Method Reference Comment
ΔrH°12.0 ± 1.5kcal/molCmCline and Kistiakowsky, 1937gas phase; Heat of formation derived by Cox and Pilcher, 1970; ALS

Tungsten, tricarbonyl(η5-2,4-cyclopentadien-1-yl)hydro- (cr) + Iodine (solution) = Hydrogen iodide (solution) + C8H5IO3W (solution)

By formula: C8H6O3W (cr) + I2 (solution) = HI (solution) + C8H5IO3W (solution)

Quantity Value Units Method Reference Comment
ΔrH°-16.1 ± 0.91kcal/molRSCLandrum and Hoff, 1985solvent: Dichloromethane; MS

C15H12MoO3 (solution) + Iodine (solution) = C8H5IMoO3 (solution) + Benzene, (iodomethyl)- (solution)

By formula: C15H12MoO3 (solution) + I2 (solution) = C8H5IMoO3 (solution) + C7H7I (solution)

Quantity Value Units Method Reference Comment
ΔrH°-28.8 ± 1.0kcal/molRSCNolan, de la Vega, et al., 1988solvent: Tetrahydrofuran; MS

C8H6MoO3 (cr) + Iodine (solution) = C8H5IMoO3 (solution) + Hydrogen iodide (solution)

By formula: C8H6MoO3 (cr) + I2 (solution) = C8H5IMoO3 (solution) + HI (solution)

Quantity Value Units Method Reference Comment
ΔrH°-18.0 ± 0.60kcal/molRSCLandrum and Hoff, 1985solvent: Dichloromethane; MS

C10MnO10Re (solution) + Iodine (solution) = Rhenium, pentacarbonyliodo- (solution) + Manganese, pentacarbonyliodo- (solution)

By formula: C10MnO10Re (solution) + I2 (solution) = C5IO5Re (solution) + C5IMnO5 (solution)

Quantity Value Units Method Reference Comment
ΔrH°-55.7 ± 3.0kcal/molPCHarel and Adamson, 1986solvent: Cyclohexane; MS

C8H5MoNaO3 (solution) + Iodine (cr) = C8H5IMoO3 (solution) + Sodium iodide (cr)

By formula: C8H5MoNaO3 (solution) + I2 (cr) = C8H5IMoO3 (solution) + INa (cr)

Quantity Value Units Method Reference Comment
ΔrH°-31.8 ± 1.3kcal/molRSCNolan, López de la Vega, et al., 1986solvent: Tetrahydrofuran; MS

1,2-Diiodotetrafluoroethane = Ethene, tetrafluoro- + Iodine

By formula: C2F4I2 = C2F4 + I2

Quantity Value Units Method Reference Comment
ΔrH°16.6 ± 0.5kcal/molEqkWu, Pickard, et al., 1975gas phase; Spectrophotometery at 298.15°K; ALS

2Propyl mercaptan + Iodine = 2Hydrogen iodide + Disulfide, dipropyl

By formula: 2C3H8S + I2 = 2HI + C6H14S2

Quantity Value Units Method Reference Comment
ΔrH°-29.85kcal/molCmSunner, 1955liquid phase; solvent: Ethanol/water(90/10); ALS

21-Pentanethiol + Iodine = 2Hydrogen iodide + Disulfide, dipentyl

By formula: 2C5H12S + I2 = 2HI + C10H22S2

Quantity Value Units Method Reference Comment
ΔrH°-29.85kcal/molCmSunner, 1955liquid phase; solvent: Ethanol/water(90/10); ALS

1,4-Butanedithiol + Iodine = 2Hydrogen iodide + 1,2-Dithiane

By formula: C4H10S2 + I2 = 2HI + C4H8S2

Quantity Value Units Method Reference Comment
ΔrH°-29.45kcal/molCmSunner, 1955liquid phase; solvent: Ethanol/water(90/10); ALS

Octanoic acid, 6,8-dimercapto- + Iodine = 2Hydrogen iodide + Thioctic acid

By formula: C8H16O2S2 + I2 = 2HI + C8H14O2S2

Quantity Value Units Method Reference Comment
ΔrH°-26.20kcal/molCmSunner, 1955liquid phase; solvent: Ethanol/water(90/10); ALS

C22H36Zr (solution) + 2Iodine (solution) = C20H30I2Zr (solution) + 2Methane, iodo- (solution)

By formula: C22H36Zr (solution) + 2I2 (solution) = C20H30I2Zr (solution) + 2CH3I (solution)

Quantity Value Units Method Reference Comment
ΔrH°-70.00 ± 0.60kcal/molRSCSchock and Marks, 1988solvent: Toluene; MS

1,3-Propanedithiol + Iodine = 2Hydrogen iodide + 1,2-Dithiolane

By formula: C3H8S2 + I2 = 2HI + C3H6S2

Quantity Value Units Method Reference Comment
ΔrH°-25.75kcal/molCmSunner, 1955liquid phase; solvent: Ethanol/water(90/10); ALS

C12H16Zr (solution) + 2Iodine (solution) = C10H10I2Zr (solution) + 2Methane, iodo- (solution)

By formula: C12H16Zr (solution) + 2I2 (solution) = C10H10I2Zr (solution) + 2CH3I (solution)

Quantity Value Units Method Reference Comment
ΔrH°-69.60 ± 0.60kcal/molRSCSchock and Marks, 1988solvent: Toluene; MS

C22H30O2Zr (solution) + Iodine (solution) = C20H30I2Zr (solution) + 2Carbon monoxide (solution)

By formula: C22H30O2Zr (solution) + I2 (solution) = C20H30I2Zr (solution) + 2CO (solution)

Quantity Value Units Method Reference Comment
ΔrH°-45.79 ± 0.41kcal/molRSCSchock and Marks, 1988solvent: Toluene; MS

C22H36Hf (solution) + 2Iodine (solution) = C20H30HfI2 (solution) + 2Methane, iodo- (solution)

By formula: C22H36Hf (solution) + 2I2 (solution) = C20H30HfI2 (solution) + 2CH3I (solution)

Quantity Value Units Method Reference Comment
ΔrH°-63.41 ± 0.79kcal/molRSCSchock and Marks, 1988solvent: Toluene; MS

C37H30ClIrO3P2S (solution) + Iodine (solution) = C37H30ClI2IrOP2 (solution) + Sulfur dioxide (solution)

By formula: C37H30ClIrO3P2S (solution) + I2 (solution) = C37H30ClI2IrOP2 (solution) + O2S (solution)

Quantity Value Units Method Reference Comment
ΔrH°-24.59 ± 0.1kcal/molRSCDrago, Nozari, et al., 1979solvent: Benzene; MS

Hydrogen iodide + Benzene, (iodomethyl)- = Toluene + Iodine

By formula: HI + C7H7I = C7H8 + I2

Quantity Value Units Method Reference Comment
ΔrH°-7.8 ± 1.1kcal/molCmGraham, Nichol, et al., 1955liquid phase; solvent: p-Xylene; ALS

Hydrogen + 2Methane, iodo- = 2Methane + Iodine

By formula: H2 + 2CH3I = 2CH4 + I2

Quantity Value Units Method Reference Comment
ΔrH°-30.0 ± 0.6kcal/molChydCarson, Carter, et al., 1961liquid phase; solvent: Ether; ALS

C20H32Zr (solution) + Iodine (solution) = C20H30I2Zr (solution) + Hydrogen (g)

By formula: C20H32Zr (solution) + I2 (solution) = C20H30I2Zr (solution) + H2 (g)

Quantity Value Units Method Reference Comment
ΔrH°-73.90 ± 0.79kcal/molRSCSchock and Marks, 1988solvent: Toluene; MS

C20H32Hf (solution) + Iodine (solution) = C20H30HfI2 (solution) + Hydrogen (g)

By formula: C20H32Hf (solution) + I2 (solution) = C20H30HfI2 (solution) + H2 (g)

Quantity Value Units Method Reference Comment
ΔrH°-70.89 ± 0.69kcal/molRSCSchock and Marks, 1988solvent: Toluene; MS

C16H10O6W2 (cr) + Iodine (solution) = 2C8H5IO3W (solution)

By formula: C16H10O6W2 (cr) + I2 (solution) = 2C8H5IO3W (solution)

Quantity Value Units Method Reference Comment
ΔrH°-34.99 ± 0.91kcal/molRSCLandrum and Hoff, 1985solvent: Dichloromethane; MS

C16H10Mo2O6 (cr) + Iodine (solution) = 2C8H5IMoO3 (solution)

By formula: C16H10Mo2O6 (cr) + I2 (solution) = 2C8H5IMoO3 (solution)

Quantity Value Units Method Reference Comment
ΔrH°-31.8 ± 1.0kcal/molRSCLandrum and Hoff, 1985solvent: Dichloromethane; MS

Dimanganese decacarbonyl (solution) + Iodine (solution) = 2Manganese, pentacarbonyliodo- (solution)

By formula: C10Mn2O10 (solution) + I2 (solution) = 2C5IMnO5 (solution)

Quantity Value Units Method Reference Comment
ΔrH°-44.9 ± 2.0kcal/molPCHarel and Adamson, 1986solvent: Cyclohexane; MS

Iodide + Iodine = (Iodide • Iodine)

By formula: I- + I2 = (I- • I2)

Quantity Value Units Method Reference Comment
ΔrH°24.0kcal/molN/ADowns and Adams, 1973gas phase; from ΔrH(f); M

Hydrogen + 2Ethane, iodo- = 2Ethane + Iodine

By formula: H2 + 2C2H5I = 2C2H6 + I2

Quantity Value Units Method Reference Comment
ΔrH°-21.2 ± 0.80kcal/molChydAshcroft, Carson, et al., 1965liquid phase; ALS

2Propane, 2-iodo- + Mercury diiodide = C6H14Hg + 2Iodine

By formula: 2C3H7I + HgI2 = C6H14Hg + 2I2

Quantity Value Units Method Reference Comment
ΔrH°57.92 ± 0.46kcal/molCmMortimer, Pritchard, et al., 1952liquid phase; ALS

2Propane, 1-iodo- + Mercury diiodide = C6H14Hg + 2Iodine

By formula: 2C3H7I + HgI2 = C6H14Hg + 2I2

Quantity Value Units Method Reference Comment
ΔrH°51.56 ± 0.58kcal/molCmMortimer, Pritchard, et al., 1952liquid phase; ALS

Hydrogen iodide + Methylsulfenyliodide = Methanethiol + Iodine

By formula: HI + CH3IS = CH4S + I2

Quantity Value Units Method Reference Comment
ΔrH°-2.88 ± 0.54kcal/molEqkShum and Benson, 1983gas phase; ALS

Acetone + Iodine = Hydrogen iodide + 1-iodoacetone

By formula: C3H6O + I2 = HI + C3H5IO

Quantity Value Units Method Reference Comment
ΔrH°12.1 ± 1.2kcal/molEqkSolly, Golden, et al., 1970gas phase; ALS

Iodine + Bromotrifluoromethane = Methane, trifluoroiodo- + iodine bromide

By formula: I2 + CBrF3 = CF3I + BrI

Quantity Value Units Method Reference Comment
ΔrH°9.55 ± 0.03kcal/molEqkLord, Goy, et al., 1967gas phase; ALS

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, 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:
L - Sharon G. Lias

Data compiled as indicated in comments:
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
B - John E. Bartmess

View reactions leading to I2+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)9.3074 ± 0.0002eVN/AN/AL

Electron affinity determinations

EA (eV) Method Reference Comment
2.5240 ± 0.0050LPESZanni, Taylor, et al., 1997B
2.52 ± 0.10NBIEAuerbach, Baeda, et al., 1973B
2.42 ± 0.20EndoHughes, Lifschitz, et al., 1973B
2.58 ± 0.10EndoChupka, Berkowitz, et al., 1971B
2.60 ± 0.10EIAEDeCorpo and Franklin, 1971From CHI3; B
2.40 ± 0.10NBIEMoutinho, Aten, et al., 1971B
2.33004ECDAyala, Wentworth, et al., 1981Vertical Detachment Energy: 1.7 eV; B
1.722 ± 0.050NBIEHubers, Kleyn, et al., 1976Stated electron affinity is the Vertical Detachment Energy; B

Ionization energy determinations

IE (eV) Method Reference Comment
9.3074 ± 0.0002TECockett, Donovan, et al., 1996LL
9.3074 ± 0.0002TECockett, Goode, et al., 1995LL
9.33PECarlson, Gerard, et al., 1988LL
9.29 ± 0.05PIGrade and Rosinger, 1985LBLHLM
9.3 ± 0.2EIGrade and Rosinger, 1985LBLHLM
9.3 ± 0.2EIGrade and Rosinger, 1984LBLHLM
9.3 ± 0.2EIGrade, Rosinger, et al., 1984LBLHLM
9.3 ± 0.05EIHoareau, Cabaud, et al., 1981LLK
9.5EIPittermann and Weil, 1980LLK
9.311 ± 0.002PEHigginson, Lloyd, et al., 1973LLK
9.22 ± 0.01PEPotts and Price, 1971LLK
~9.37PIDibeler, Walker, et al., 1971LLK
9.3995 ± 0.0012SVenkateswarlu, 1970RDSH
9.331PIMyer and Samson, 1970RDSH
9.356PEKimura, Katsumata, et al., 1981Vertical value; LLK
9.34PECornford, Frost, et al., 1971Vertical value; LLK

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
I+8.8 ± 0.2I-EIGrade and Rosinger, 1985LBLHLM
I+11.94 ± 0.15IPIGrade and Rosinger, 1985LBLHLM
I+8.83 ± 0.07I-PIGrade and Rosinger, 1985LBLHLM
I+8.9 ± 0.2I-EIGrade and Rosinger, 1984LBLHLM
I+8.8 ± 0.2I-EIGrade, Rosinger, et al., 1984LBLHLM
I+13.0IEIPittermann and Weil, 1980LLK
I+8.922 ± 0.013I-PIMyer and Samson, 1970RDSH
I+8.95 ± 0.02I-PIMorrison, Hurzeler, et al., 1960RDSH
I+8.83 ± 0.02I-PIWatanabe, 1957RDSH

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, 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
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Do, K.; Klein, T.P.; Pommerening, C.A.; Sunderlin, L.S., A New Flowing Afterglow-Guided Ion Beam Tandem Mass Spectrometer. Applications to the Thermochemistry of Polyiodide Ions, J. Am. Soc. Mass Spectrom., 1997, 8, 7, 688, https://doi.org/10.1016/S1044-0305(97)00116-5 . [all data]

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Finch, A.; Gates, P.N.; Peake, S.J., Thermochemistry of polyhalides. III. Cesium and rubidium tetrachloroiodates, J. Inorg. Nucl. Chem., 1977, 39, 2135. [all data]

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Adamson, Vogler, et al., 1978
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Pedley, Skinner, et al., 1957
Pedley, J.B.; Skinner, H.A.; Chernick, C.L., Thermochemistry of metallic alkyls. Part 8.?Tin tetramethyl, and hexamethyl distannane, Trans. Faraday Soc., 1957, 53, 1612, https://doi.org/10.1039/tf9575301612 . [all data]

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Sunner, S., Strain in 6,8-thioctic acid, Nature (London), 1955, 176, 217. [all data]

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Schock, L.E.; Marks, T.J., J. Am. Chem. Soc., 1988, 110, 7701. [all data]

Drago, Nozari, et al., 1979
Drago, R.S.; Nozari, M.S.; Klinger, R.J.; Chamberlain, C.S., Inorg. Chem., 1979, 18, 1254. [all data]

Graham, Nichol, et al., 1955
Graham, W.S.; Nichol, R.J.; Ubbelohde, A.R., A thermochemical evaluation of bond strengths in some carbon compounds. Part III. Bond strengths based on the reactions: (a) Ph·CH2I + HI=Ph·CH3 + I2 and (b) PhI + HI=PhH + I2, J. Chem. Soc., 1955, 115-121. [all data]

Carson, Carter, et al., 1961
Carson, A.S.; Carter, W.; Pedley, J.B., The thermochemistry of reductions caused by lithium aluminium hydride I. The C-I bond dissociation energy in CH3I, Proc. Roy. Soc. London A, 1961, 260, 550-557. [all data]

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Downs, A.J.; Adams, G.J., Comprehensive Inorganic Chemistry, J. C. Bailar, H. J. Emeleus, R. Nyholm and A. F. Trotman - Dickerson, ed(s)., Pergamon Press, New York, 1973, 1543. [all data]

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Mortimer, C.T.; Pritchard, H.O.; Skinner, H.A., Thermochemistry of metallic alkyls. Part V - Mercury di-propyl and mercury di-isopropyl, Trans. Faraday Soc., 1952, 48, 220-229. [all data]

Shum and Benson, 1983
Shum, L.G.S.; Benson, S.W., Thermochemnistry and kinetics of the reaction of methyl mercaptan with iodine, Int. J. Chem. Kinet., 1983, 15, 433-453. [all data]

Solly, Golden, et al., 1970
Solly, R.K.; Golden, D.M.; Benson, S.W., Thermochemical properties of iodoacetone. Intramolecular electrostatic interactions in polar molecules, J. Am. Chem. Soc., 1970, 92, 4653-4656. [all data]

Zanni, Taylor, et al., 1997
Zanni, M.T.; Taylor, T.R.; Greenblatt, J.; Soep, B.; Neumark, D.M., Characterization of the I2- Anion Ground State Using Conventional and Femtosecond Photoelectron Spectroscopy, J. Chem. Phys., 1997, 107, 19, 7613, https://doi.org/10.1063/1.475110 . [all data]

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Auerbach, J.; Baeda, A.P.M.; Los, D.J., Fragmentation of Negative Ions Formed in Collisions of Alkali Atoms and Halogen Molecules, Physica, 1973, 64, 1, 134, https://doi.org/10.1016/0031-8914(73)90119-5 . [all data]

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Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, References