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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

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 by: John E. Bartmess

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

(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

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

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, Vibrational and/or electronic energy levels, Notes

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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