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H2C=C radical anion


Gas phase 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 by: John E. Bartmess

Quantity Value Units Method Reference Comment
Deltafgas92.0 ± 3.6kcal/molR-EAErvin, Gronert, et al., 1990Vinylidene neutral: «DELTA»Hf<=99±2 kcal, Kiefer, Sidhu, et al., 1989
Deltafgas61. ± 35.kcal/molIMRBDawson and Nibbering, 1978 
Deltafgas61. ± 35.kcal/molIMRBDawson and Jennings, 1976O- + C2H4 ->, C2H2- + N2O -> CH2CN-

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 by: 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.

Individual Reactions

(C2H2- bullet 4294967295Ethynyl radical) + Ethynyl radical = C2H2-

By formula: (C2H2- bullet 4294967295C2H) + C2H = C2H2-

Quantity Value Units Method Reference Comment
Deltar78.5 ± 3.6kcal/molN/AErvin, Gronert, et al., 1990gas phase; Vinylidene neutral: «DELTA»Hf<=99±2 kcal, Kiefer, Sidhu, et al., 1989
Deltar44.6 ± 3.3kcal/molTherGuo and Grabowski, 1990gas phase; Between PhF, Me3P

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:   A


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

Td = 3950 ± 50 gas A-X Ervin, Ho, et al., 1989

State:   X


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

a1 1 CH2 s-stretch 2663 ± 5 A gas PF Gerardi, Breen, et al., 2010
2 CC stretch 1485 ± 30 gas PE Ervin, Ho, et al., 1989
3 CH2 scissors 1305 ± 10 gas PE Ervin, Ho, et al., 1989
b2 5 CH2 a-stretch 2606 ± 5 A gas PF Gerardi, Breen, et al., 2010

Additional references: Jacox, 1994, page 139

Notes

dPhotodissociation threshold
A0~1 cm-1 uncertainty

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.

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]

Kiefer, Sidhu, et al., 1989
Kiefer, J.H.; Sidhu, S.S.; Kumaran, S.S.; Irdan, E.A., RRKM Model of C2H4 Dissociation: Heat of Formation of Vinylidene, Chem. Phys. Lett., 1989, 159, 1, 32, https://doi.org/10.1016/S0009-2614(89)87448-2 . [all data]

Dawson and Nibbering, 1978
Dawson, J.H.J.; Nibbering, N.M.M., Concerning CH2=C-. and its reaction with 14N 15NO, J. Am. Chem. Soc., 1978, 100, 1928. [all data]

Dawson and Jennings, 1976
Dawson, J.H.J.; Jennings, K.R., Production of gas phase radical anions by reaction of O-. Ions with organic substrates, J. Chem. Soc. Faraday Trans. 2, 1976, 72, 700. [all data]

Guo and Grabowski, 1990
Guo, Y.; Grabowski, J.J., Gas Phase Ion Chemistry of the Vinylidene Radical Anion and the Acidity of the Vinyl Radical, Int. J. Mass Spectrom. Ion Proc., 1990, 97, 3, 253, https://doi.org/10.1016/0168-1176(90)85003-K . [all data]

Ervin, Ho, et al., 1989
Ervin, K.M.; Ho, J.; Linberger, W.C., A Study of the Singlet and Triplet States of Vinylidene by Photoelectron Spectroscopy of H2C=C-, D2C=C-, and HDC=C-. Vinylidene-Acetylene Isomerization, J. Chem. Phys., 1989, 91, 10, 5974, https://doi.org/10.1063/1.457415 . [all data]

Gerardi, Breen, et al., 2010
Gerardi, H.K.; Breen, K.J.; Guasco, T.L.; Weddle, G.H.; Gardenier, G.H.; Laaser, J.E.; Johnson, M.A., Survey of Ar-Tagged Predissociation and Vibrationally Mediated Photodetachment Spectroscopies of the Vinylidene Anion, C, J. Phys. Chem. A, 2010, 114, 3, 1592, https://doi.org/10.1021/jp9095419 . [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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