CH2CN 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

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Individual Reactions

C2H2N- + Hydrogen cation = Acetonitrile

By formula: C2H2N- + H+ = C2H3N

Quantity Value Units Method Reference Comment
Δr1560. ± 8.8kJ/molG+TSBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Δr1544. ± 19.kJ/molCIDTGraul and Squires, 1990gas phase; B
Δr1562. ± 11.kJ/molG+TSCumming and Kebarle, 1978gas phase; B
Δr1568. ± 8.4kJ/molD-EAZimmerman and Brauman, 1977gas phase; B
Δr1534. ± 19.kJ/molEIAEHeni and Illenberger, 1986gas phase; From MeCN; B
Quantity Value Units Method Reference Comment
Δr1528. ± 8.4kJ/molIMREBartmess, Scott, et al., 1979gas phase; value altered from reference due to change in acidity scale; B
Δr1530. ± 8.4kJ/molIMRECumming and Kebarle, 1978gas phase; B
Δr1536. ± 8.8kJ/molH-TSZimmerman and Brauman, 1977gas phase; B

C2H2N- + Acetonitrile = (C2H2N- • Acetonitrile)

By formula: C2H2N- + C2H3N = (C2H2N- • C2H3N)

Quantity Value Units Method Reference Comment
Δr53.6 ± 4.2kJ/molTDAsMeot-ner, 1988gas phase; B,M
Δr65.69kJ/molTDAsHiraoka, Mizure, et al., 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr95.4J/mol*KPHPMSHiraoka, Mizure, et al., 1988gas phase; M
Δr56.1J/mol*KPHPMSMeot-ner, 1988gas phase; M
Quantity Value Units Method Reference Comment
Δr37. ± 4.2kJ/molTDAsMeot-ner, 1988gas phase; B
Δr37.2kJ/molTDAsHiraoka, Mizure, et al., 1988gas phase; B

C2H2N- + Water = (C2H2N- • Water)

By formula: C2H2N- + H2O = (C2H2N- • H2O)

Quantity Value Units Method Reference Comment
Δr55.2 ± 4.2kJ/molTDAsMeot-ner, 1988gas phase; B,M
Quantity Value Units Method Reference Comment
Δr73.6J/mol*KPHPMSMeot-ner, 1988gas phase; M
Quantity Value Units Method Reference Comment
Δr33. ± 4.2kJ/molTDAsMeot-ner, 1988gas phase; B

Vibrational and/or electronic energy levels

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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: Marilyn E. Jacox

State:   Dip


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 12428.665 ± 0.002 gas Lykke, Neumark, et al., 1987
Wetzel and Brauman, 1989


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

951 ± 10 gas PD Wetzel and Brauman, 1989
b1 5 H2CC deform. 692 ± 10 gas PD Wetzel and Brauman, 1989

State:   X


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

a' 5 H2CC deform. 424.77 gas PD PE Marks, Wetzel, et al., 1986
Moran, Ellis, et al., 1987
Lykke, Neumark, et al., 1987

Additional references: Jacox, 1994, page 252

Notes

oEnergy separation between the v = 0 levels of the excited and electronic ground states.

References

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

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]

Graul and Squires, 1990
Graul, S.T.; Squires, R.R., Gas-Phase Acidities Derived from Threshold Energies for Activated Reactions, J. Am. Chem. Soc., 1990, 112, 7, 2517, https://doi.org/10.1021/ja00163a007 . [all data]

Cumming and Kebarle, 1978
Cumming, J.B.; Kebarle, P., Summary of gas phase measurements involving acids AH. Entropy changes in proton transfer reactions involving negative ions. Bond dissociation energies D(A-H) and electron affinities EA(A), Can. J. Chem., 1978, 56, 1. [all data]

Zimmerman and Brauman, 1977
Zimmerman, A.H.; Brauman, J.I., Electron photodetachment from negative ions of C2v symmetry. Electron affinities of allyl and cyanomethyl radicals, J. Am. Chem. Soc., 1977, 99, 3565. [all data]

Heni and Illenberger, 1986
Heni, M.; Illenberger, E., Electron attachment by saturated nitriles. Acrylonitrile (CH2H3CN), and benzonitrile (C6H5CN), Int. J. Mass Spectrom. Ion Phys., 1986, 73, 127. [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]

Hiraoka, Mizure, et al., 1988
Hiraoka, K.; Mizure, S.; Yamabe, S.; Nakatsuji, Y., Gas Phase Clustering Reactions of CN- and CH2CN- with MeCN, Chem. Phys. Lett., 1988, 148, 6, 497, https://doi.org/10.1016/0009-2614(88)80320-8 . [all data]

Lykke, Neumark, et al., 1987
Lykke, K.R.; Neumark, D.M.; Andersen, T.; Trapa, V.J.; Lineberger, W.C., Autodetachment spectroscopy and dynamics of CH2CN- and CD2CN-, J. Chem. Phys., 1987, 87, 12, 6842, https://doi.org/10.1063/1.453379 . [all data]

Wetzel and Brauman, 1989
Wetzel, D.M.; Brauman, J.I., Rotational structure in an excited vibronic band of the dipole-supported state of cyanomethyl anion, CH2CN-, J. Chem. Phys., 1989, 90, 1, 68, https://doi.org/10.1063/1.456468 . [all data]

Marks, Wetzel, et al., 1986
Marks, J.; Wetzel, D.M.; Comita, P.B.; Brauman, J.I., A dipole supported state in cyanomethyl anion, the conjugate base of acetonitrile. Rotational band assignments in the electron photodetachment spectrum of -CH2CN, J. Chem. Phys., 1986, 84, 5284. [all data]

Moran, Ellis, et al., 1987
Moran, S.; Ellis, H.B., Jr.; DeFrees, D.J.; McLean, A.D.; Ellison, G.B., Carbanion spectroscopy: CH2CN-, J. Am. Chem. Soc., 1987, 109, 5996. [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]


Notes

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