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Acetylene

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Reaction thermochemistry data

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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
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
RCD - Robert C. Dunbar
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
MS - José A. Martinho Simões

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.

Individual Reactions

C2H- + Hydrogen cation = Acetylene

By formula: C2H- + H+ = C2H2

Quantity Value Units Method Reference Comment
Deltar1580. ± 20.kJ/molAVGN/AAverage of 8 values; Individual data points
Quantity Value Units Method Reference Comment
Deltar1550. ± 20.kJ/molAVGN/AAverage of 7 values; Individual data points

COS+ + Acetylene = (COS+ bullet Acetylene)

By formula: COS+ + C2H2 = (COS+ bullet C2H2)

Quantity Value Units Method Reference Comment
Deltar116.kJ/molPD/KERDGraul S.T. and Bowers, 1991gas phase; «DELTA»rH>=; M
Deltar140.kJ/molPDissOrlando, Friedman, et al., 1990gas phase; M
Deltar140.kJ/molPDissOrlando, Friedman, et al., 1990gas phase; M
Deltar141. ± 22.kJ/molPDissOrlando, Friedman, et al., 1990gas phase; «DELTA»rH<; M

Cobalt ion (1+) + Acetylene = (Cobalt ion (1+) bullet Acetylene)

By formula: Co+ + C2H2 = (Co+ bullet C2H2)

Quantity Value Units Method Reference Comment
Deltar180. ± 7.9kJ/molIRMPDSurya, Ranatunga, et al., 1997RCD

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
27. (+13.,-0.) CIDArmentrout and Kickel, 1994gas phase; «DELTA»rH >=, guided ion beam CID; M

Nickel ion (1+) + Acetylene = (Nickel ion (1+) bullet Acetylene)

By formula: Ni+ + C2H2 = (Ni+ bullet C2H2)

Quantity Value Units Method Reference Comment
Deltar188. ± 7.9kJ/molIRMPDSurya, Ranatunga, et al., 1997RCD

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
7. (+18.,-0.) CIDArmentrout and Kickel, 1994gas phase; «DELTA»rH>=, guided ion beam CID; M

2Hydrogen + Acetylene = Ethane

By formula: 2H2 + C2H2 = C2H6

Quantity Value Units Method Reference Comment
Deltar-312.0 ± 0.63kJ/molChydConn, Kistiakowsky, et al., 1939gas phase; Reanalyzed by Cox and Pilcher, 1970, Original value = -314.1 ± 2.8 kJ/mol; At 355 K; ALS

2,5-Norbornadiene = 1,3-Cyclopentadiene + Acetylene

By formula: C7H8 = C5H6 + C2H2

Quantity Value Units Method Reference Comment
Deltar117.2 ± 2.1kJ/molKinWalsh and Wells, 1975gas phase; Reanalyzed by Pedley, Naylor, et al., 1986, Original value = 118.7 ± 1.3 kJ/mol; ALS

C2Na2 (cr) + 2Water (l) = 2(Sodium hydroxide bullet 1418Water) (solution) + Acetylene (g)

By formula: C2Na2 (cr) + 2H2O (l) = 2(HNaO bullet 1418H2O) (solution) + C2H2 (g)

Quantity Value Units Method Reference Comment
Deltar-161.8 ± 1.5kJ/molRSCJohnson, van Deventer, et al., 1973Please also see Pedley and Rylance, 1977.; MS

C2HCs (cr) + Water (l) = (Cesium hydroxide bullet 1031Water) (solution) + Acetylene (g)

By formula: C2HCs (cr) + H2O (l) = (HCsO bullet 1031H2O) (solution) + C2H2 (g)

Quantity Value Units Method Reference Comment
Deltar-54.0 ± 0.8kJ/molRSCAder and Hubbard, 1973Please also see Pedley and Rylance, 1977.; MS

C2HNa (cr) + Water (l) = (Sodium hydroxide bullet 1418Water) (solution) + Acetylene (g)

By formula: C2HNa (cr) + H2O (l) = (HNaO bullet 1418H2O) (solution) + C2H2 (g)

Quantity Value Units Method Reference Comment
Deltar-54.2 ± 0.8kJ/molRSCJohnson, van Deventer, et al., 1973Please also see Pedley and Rylance, 1977.; MS

Copper ion (1+) + Acetylene = (Copper ion (1+) bullet Acetylene)

By formula: Cu+ + C2H2 = (Cu+ bullet C2H2)

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
10. (+10.,-0.) CIDArmentrout and Kickel, 1994gas phase; «DELTA»rH>=, guided ion beam CID; M

2Acetylene = 1-Buten-3-yne

By formula: 2C2H2 = C4H4

Quantity Value Units Method Reference Comment
Deltar233.kJ/molCmReppe, Schlichting, et al., 1948liquid phase; ALS
Deltar208.kJ/molCmReppe, Schlichting, et al., 1948gas phase; ALS

Rh+ + Acetylene = (Rh+ bullet Acetylene)

By formula: Rh+ + C2H2 = (Rh+ bullet C2H2)

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
129. CIDChen and Armetrout, 1995gas phase; «DELTA»rH>=, guided ion beam CID; M

Chromium ion (1+) + Acetylene = (Chromium ion (1+) bullet Acetylene)

By formula: Cr+ + C2H2 = (Cr+ bullet C2H2)

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
184. (+20.,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M

Titanium ion (1+) + Acetylene = (Titanium ion (1+) bullet Acetylene)

By formula: Ti+ + C2H2 = (Ti+ bullet C2H2)

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
253. (+20.,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M

Lanthanum ion (1+) + Acetylene = (Lanthanum ion (1+) bullet Acetylene)

By formula: La+ + C2H2 = (La+ bullet C2H2)

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
262. (+30.,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M

Scandium ion (1+) + Acetylene = (Scandium ion (1+) bullet Acetylene)

By formula: Sc+ + C2H2 = (Sc+ bullet C2H2)

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
240. (+20.,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M

Vanadium ion (1+) + Acetylene = (Vanadium ion (1+) bullet Acetylene)

By formula: V+ + C2H2 = (V+ bullet C2H2)

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
205. (+20.,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M

Yttrium ion (1+) + Acetylene = (Yttrium ion (1+) bullet Acetylene)

By formula: Y+ + C2H2 = (Y+ bullet C2H2)

Enthalpy of reaction

DeltarH° (kJ/mol) T (K) Method Reference Comment
253. (+30.,-0.) CIDArmentrout and Kickel, 1994gas phase; guided ion beam CID; M

Bromine anion + Acetylene = C2H2Br-

By formula: Br- + C2H2 = C2H2Br-

Quantity Value Units Method Reference Comment
Deltar36.0kJ/molLPESWild, Milley, et al., 2000gas phase; Given: 8.635±0.009 kcal/mol(0 K); B

C2Ag2 (cr) + 2(Hydrogen chloride bullet 12.3Water) (solution) = Acetylene (aq) + 2Silver chloride (cr)

By formula: C2Ag2 (cr) + 2(HCl bullet 12.3H2O) (solution) = C2H2 (aq) + 2AgCl (cr)

Quantity Value Units Method Reference Comment
Deltar-77.8 ± 0.6kJ/molRSCFinch, Gardner, et al., 1991MS

(CAS Reg. No. 25012-81-1 bullet 4294967295Acetylene) + Acetylene = CAS Reg. No. 25012-81-1

By formula: (CAS Reg. No. 25012-81-1 bullet 4294967295C2H2) + C2H2 = CAS Reg. No. 25012-81-1

Quantity Value Units Method Reference Comment
Deltar138.2 ± 3.0kJ/molN/AErvin, Gronert, et al., 1990gas phase; B

Aluminum ion (1+) + Acetylene = (Aluminum ion (1+) bullet Acetylene)

By formula: Al+ + C2H2 = (Al+ bullet C2H2)

Quantity Value Units Method Reference Comment
Deltar54.4 ± 8.4kJ/molCIDC,EqGStockigt, Schwarz, et al., 1996Anchored to theory; RCD

Ethylene, 1,2-dichloro-, (Z)- = Acetylene + Chlorine

By formula: C2H2Cl2 = C2H2 + Cl2

Quantity Value Units Method Reference Comment
Deltar21.kJ/molKinLaursen and Pimentel, 1989gas phase; Photolyses; ALS

Ethene, chloro- = Acetylene + Hydrogen chloride

By formula: C2H3Cl = C2H2 + HCl

Quantity Value Units Method Reference Comment
Deltar100.7 ± 1.2kJ/molCmLacher, Gottlieb, et al., 1962gas phase; ALS

1,3-Cyclopentadiene + Acetylene = 2,5-Norbornadiene

By formula: C5H6 + C2H2 = C7H8

Quantity Value Units Method Reference Comment
Deltar-117. ± 2.kJ/molEqkWalsh and Wells, 1975gas phase; ALS

C2H2+ + Acetylene = (C2H2+ bullet Acetylene)

By formula: C2H2+ + C2H2 = (C2H2+ bullet C2H2)

Quantity Value Units Method Reference Comment
Deltar94.6kJ/molPIOno and Ng, 1982gas phase; M

Iron ion (1+) + Acetylene = (Iron ion (1+) bullet Acetylene)

By formula: Fe+ + C2H2 = (Fe+ bullet C2H2)

Quantity Value Units Method Reference Comment
Deltar151. ± 7.9kJ/molIRMPDSurya, Ranatunga, et al., 1997RCD

(Z)-1,2-Diiodoethylene = Acetylene + Iodine

By formula: C2H2I2 = C2H2 + I2

Quantity Value Units Method Reference Comment
Deltar83.3kJ/molEqkFuruyama, Golden, et al., 1968gas phase; ALS

C2H2I2 = Acetylene + Iodine

By formula: C2H2I2 = C2H2 + I2

Quantity Value Units Method Reference Comment
Deltar83.3kJ/molEqkFuruyama, Golden, et al., 1968gas phase; ALS

References

Go To: Top, Reaction thermochemistry data, Notes

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

Graul S.T. and Bowers, 1991
Graul S.T.; Bowers, M.T., Dynamics of Metastable Dissociation and Photodissociation of the Gas Phase Cluster Ion (OCS.C2H2)+, J. Phys. Chem., 1991, 95, 21, 8328, https://doi.org/10.1021/j100174a055 . [all data]

Orlando, Friedman, et al., 1990
Orlando, T.M.; Friedman, A.; Maier, J.P., Photodissociation Spectroscopy of the [OCS C2H2]+ Cluster, J. Chem. Phys., 1990, 92, 12, 7365, https://doi.org/10.1063/1.458222 . [all data]

Surya, Ranatunga, et al., 1997
Surya, P.I.; Ranatunga, D.R.A.; Freiser, B.S., Infrared Multiphoton Dissociation of MC4H6+ [M=Fe, Co or Ni: C4H6=1,3-butadiene or (C2H2)(C2H4), J. Am. Chem. Soc., 1997, 119, 14, 3351, https://doi.org/10.1021/ja963200c . [all data]

Armentrout and Kickel, 1994
Armentrout, P.B.; Kickel, B.L., Gas Phase Thermochemistry of Transition Metal Ligand Systems: Reassessment of Values and Periodic Trends, in Organometallic Ion Chemistry, B. S. Freiser, ed, 1994. [all data]

Conn, Kistiakowsky, et al., 1939
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]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Walsh and Wells, 1975
Walsh, R.; Wells, J.M., The enthalpy of formation of bicyclo[2,2,1]hepta-2,5-diene. Thermodynamic functions of bicyclo[2,2,1]heptane and bicyclo[2,2,1]hepta-2,5-diene, J. Chem. Thermodyn., 1975, 7, 149-154. [all data]

Pedley, Naylor, et al., 1986
Pedley, J.B.; Naylor, R.D.; Kirby, S.P., Thermochemical Data of Organic Compounds, Chapman and Hall, New York, 1986, 1-792. [all data]

Johnson, van Deventer, et al., 1973
Johnson, G.K.; van Deventer, E.H.; Ackerman, J.P.; Hubbard, W.N.; Osborne, D.W.; Flotow, H.L., J. Chem. Thermodyn., 1973, 5, 57. [all data]

Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J., Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]

Ader and Hubbard, 1973
Ader, M.; Hubbard, W.N., J. Chem. Thermodyn., 1973, 5, 607. [all data]

Reppe, Schlichting, et al., 1948
Reppe, W.; Schlichting, O.; Klager, K.; Toepel, T., Cyclisierende Polymerisation von Acetylen I Uber Cyclooctatetraen, Justus Liebigs Ann. Chem., 1948, 1-93. [all data]

Chen and Armetrout, 1995
Chen, Y.M.; Armetrout, P.B., Activation of C2H6, C3H8, and c-C3H6 by Gas-Phase Rh+ and the Thermochemistry of Rh-Ligand Complexes, J. Am. Chem. Soc., 1995, 117, 36, 9291, https://doi.org/10.1021/ja00141a022 . [all data]

Wild, Milley, et al., 2000
Wild, D.A.; Milley, P.J.; Loh, Z.M.; Wolynec, P.P.; Weiser, P.S.; Bieske, E.J., Structural and Energetic Properties of the Br--C2H2 Anion Complex from Rotationally Resolved Mid-infrared Spectra And ab initio Calculations, J. Chem. Phys., 2000, 113, 3, 1075, https://doi.org/10.1063/1.481919 . [all data]

Finch, Gardner, et al., 1991
Finch, A.; Gardner, P.J.; Head, A.J.; Majdi, H.S., Thermochim. Acta, 1991, 180, 325. [all data]

Ervin, Gronert, et al., 1990
Ervin, K.M.; Gronert, S.; Barlow, S.E.; Gilles, M.K.; Harrison, A.G.; Bierbaum, V.M.; DePuy, C.H.; Lin, W.C., Bonds Strengths of Ethylene and Acetylene, J. Am. Chem. Soc., 1990, 112, 15, 5750, https://doi.org/10.1021/ja00171a013 . [all data]

Stockigt, Schwarz, et al., 1996
Stockigt, D.; Schwarz, J.; Schwarz, H., Theoretical and Experimental Studies on the Bond Dissociation Energies of Al(methane)+, Al(acetylene)+, Al(ethene)+, and Al(ethane)+, J. Phys. Chem., 1996, 100, 21, 8786, https://doi.org/10.1021/jp960060k . [all data]

Laursen and Pimentel, 1989
Laursen, S.L.; Pimentel, G.C., Matrix-induced intersystem crossing in the photochemistry of the 1,2-dichloroethenes, J. Phys. Chem., 1989, 93, 2328-2333. [all data]

Lacher, Gottlieb, et al., 1962
Lacher, J.R.; Gottlieb, H.B.; Park, J.D., Reaction heats of organic compounds. Part 2.-Heat of addition of hydrogen chloride to acetylene, Trans. Faraday Soc., 1962, 58, 2348-2351. [all data]

Ono and Ng, 1982
Ono, Y.; Ng, C.Y., A Study of the Unimolecular Decomposition of the (C2H2)2+ Complex, J. Chem. Phys., 1982, 77, 6, 2947, https://doi.org/10.1063/1.444216 . [all data]

Furuyama, Golden, et al., 1968
Furuyama, S.; Golden, D.M.; Benson, S.W., The thermochemistry of the gas-phase equilibria trans-1,2-diiodoethylene = acetylene + I2 and trans-1,2-diiodoethylene = cis-1,2-diiodoethylene, J. Phys. Chem., 1968, 72, 3204-3208. [all data]


Notes

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