HCðC anion


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

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
Δr1580. ± 20.kJ/molAVGN/AAverage of 8 values; Individual data points
Quantity Value Units Method Reference Comment
Δr1550. ± 20.kJ/molAVGN/AAverage of 7 values; Individual data points

(C2H- • 4294967295Dicarbon) + Dicarbon = C2H-

By formula: (C2H- • 4294967295C2) + C2 = C2H-

Quantity Value Units Method Reference Comment
Δr678. ± 16.kJ/molN/AZhou, Garand, et al., 2007gas phase; B
Δr535. ± 16.kJ/molTherRuscic and Berkowitz, 1990gas phase; 376.7 0K; corrected with data from Gurvich, Veyts, et al.; B
Δr703. ± 11.kJ/molTherBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B

C2H- + Methyl Alcohol = C3H5O-

By formula: C2H- + CH4O = C3H5O-

Quantity Value Units Method Reference Comment
Δr90.4 ± 8.4kJ/molIMREChabinyc and Brauman, 1999gas phase; Anchored to MeOH ΔGacid=375.2; B
Quantity Value Units Method Reference Comment
Δr45.61kJ/molIMREMustanir, Matsuoka, et al., 2006gas phase; B
Δr48.5 ± 8.4kJ/molIMREChabinyc and Brauman, 1999gas phase; Anchored to MeOH ΔGacid=375.2; B

C2H- + Methanol-D4 = C3H2D5-

By formula: C2H- + CD4O = C3H2D5-

Quantity Value Units Method Reference Comment
Δr89.5 ± 4.2kJ/molIMREChabinyc and Brauman, 2000gas phase; Original dG=11.3 at 350K; dS based on symmetry alone; B
Quantity Value Units Method Reference Comment
Δr53.6 ± 4.2kJ/molIMREChabinyc and Brauman, 2000gas phase; Original dG=11.3 at 350K; dS based on symmetry alone; B

C2H- + Fluoroform = C3H2F3-

By formula: C2H- + CHF3 = C3H2F3-

Quantity Value Units Method Reference Comment
Δr80.8 ± 4.2kJ/molIMREChabinyc and Brauman, 2000gas phase; Original dG=9.2 at 350K; dS based on symmetry alone; B
Quantity Value Units Method Reference Comment
Δr44.8 ± 4.2kJ/molIMREChabinyc and Brauman, 2000gas phase; Original dG=9.2 at 350K; dS based on symmetry alone; B

C2H- + Water = (C2H- • Water)

By formula: C2H- + H2O = (C2H- • H2O)

Quantity Value Units Method Reference Comment
Δr67.8 ± 4.2kJ/molTDAsMeot-ner, 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr77.8J/mol*KPHPMSMeot-ner, 1988gas phase; M
Quantity Value Units Method Reference Comment
Δr44.4 ± 4.2kJ/molTDAsMeot-ner, 1988gas phase; B

Gas phase ion energetics 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 by: John E. Bartmess

Protonation reactions

C2H- + Hydrogen cation = Acetylene

By formula: C2H- + H+ = C2H2

Quantity Value Units Method Reference Comment
Δr1580. ± 20.kJ/molAVGN/AAverage of 8 values; Individual data points
Quantity Value Units Method Reference Comment
Δr1550. ± 20.kJ/molAVGN/AAverage of 7 values; Individual data points

Ion clustering 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

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

C2H- + Methanol-D4 = C3H2D5-

By formula: C2H- + CD4O = C3H2D5-

Quantity Value Units Method Reference Comment
Δr89.5 ± 4.2kJ/molIMREChabinyc and Brauman, 2000gas phase; Original dG=11.3 at 350K; dS based on symmetry alone; B
Quantity Value Units Method Reference Comment
Δr53.6 ± 4.2kJ/molIMREChabinyc and Brauman, 2000gas phase; Original dG=11.3 at 350K; dS based on symmetry alone; B

C2H- + Fluoroform = C3H2F3-

By formula: C2H- + CHF3 = C3H2F3-

Quantity Value Units Method Reference Comment
Δr80.8 ± 4.2kJ/molIMREChabinyc and Brauman, 2000gas phase; Original dG=9.2 at 350K; dS based on symmetry alone; B
Quantity Value Units Method Reference Comment
Δr44.8 ± 4.2kJ/molIMREChabinyc and Brauman, 2000gas phase; Original dG=9.2 at 350K; dS based on symmetry alone; B

C2H- + Methyl Alcohol = C3H5O-

By formula: C2H- + CH4O = C3H5O-

Quantity Value Units Method Reference Comment
Δr90.4 ± 8.4kJ/molIMREChabinyc and Brauman, 1999gas phase; Anchored to MeOH ΔGacid=375.2; B
Quantity Value Units Method Reference Comment
Δr45.61kJ/molIMREMustanir, Matsuoka, et al., 2006gas phase; B
Δr48.5 ± 8.4kJ/molIMREChabinyc and Brauman, 1999gas phase; Anchored to MeOH ΔGacid=375.2; B

(C2H- • 4294967295Dicarbon) + Dicarbon = C2H-

By formula: (C2H- • 4294967295C2) + C2 = C2H-

Quantity Value Units Method Reference Comment
Δr678. ± 16.kJ/molN/AZhou, Garand, et al., 2007gas phase; B
Δr535. ± 16.kJ/molTherRuscic and Berkowitz, 1990gas phase; 376.7 0K; corrected with data from Gurvich, Veyts, et al.; B
Δr703. ± 11.kJ/molTherBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B

C2H- + Water = (C2H- • Water)

By formula: C2H- + H2O = (C2H- • H2O)

Quantity Value Units Method Reference Comment
Δr67.8 ± 4.2kJ/molTDAsMeot-ner, 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr77.8J/mol*KPHPMSMeot-ner, 1988gas phase; M
Quantity Value Units Method Reference Comment
Δr44.4 ± 4.2kJ/molTDAsMeot-ner, 1988gas phase; B

References

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Notes

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

Zhou, Garand, et al., 2007
Zhou, J.; Garand, E.; Neumark, D.M., Vibronic structure in C2H and C2D from anion slow electron velocity-map imaging spectroscopy, J. Chem. Phys., 2007, 127, 11, 114313, https://doi.org/10.1063/1.2768932 . [all data]

Ruscic and Berkowitz, 1990
Ruscic, B.; Berkowitz, J., Photoion-pair Formation and Photoelectron-induced Dissociative Attachment in C2H2: D0(HCC-H), J. Chem. Phys., 1990, 93, 8, 5586, https://doi.org/10.1063/1.459629 . [all data]

Gurvich, Veyts, et al.
Gurvich, L.V.; Veyts, I.V.; Alcock, C.B., Hemisphere Publishing, NY, 1989, V. 1 2, Thermodynamic Properties of Individual Substances, 4th Ed. [all data]

Bartmess, Scott, et al., 1979
Bartmess, J.E.; Scott, J.A.; McIver, R.T., Jr., The gas phase acidity scale from methanol to phenol, J. Am. Chem. Soc., 1979, 101, 6047. [all data]

Chabinyc and Brauman, 1999
Chabinyc, M.L.; Brauman, J.I., Hydrogen bond strength and acidity. Structural and energetic correlations for acetylides and alcohols, J. Phys. Chem. A, 1999, 103, 46, 9163-9166, https://doi.org/10.1021/jp992852v . [all data]

Mustanir, Matsuoka, et al., 2006
Mustanir; Matsuoka, M.; Mishima, M.; Koch, H., Stability of complexes of phenylacetylides and benzyl alkoxides with methanol in the gas phase. Acid-base correlation in the ionic hydrogen-bond strength, Bull. Chem. Soc. Japan, 2006, 79, 7, 1118-1125, https://doi.org/10.1246/bcsj.79.1118 . [all data]

Chabinyc and Brauman, 2000
Chabinyc, M.L.; Brauman, J.I., Unusual ionic hydrogen bonds: Complexes of acetylides and fluoroform, J. Am. Chem. Soc., 2000, 122, 36, 8739-8745, https://doi.org/10.1021/ja000806z . [all data]

Meot-ner, 1988
Meot-ner, M., The Ionic Hydrogen Bond and Solvation. 7. Interaction Energies of Carbanions with Solvent Molecules, J. Am. Chem. Soc., 1988, 110, 12, 3858, https://doi.org/10.1021/ja00220a022 . [all data]


Notes

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