Methylene, difluoro-

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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 by: John E. Bartmess

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Individual Reactions

(CF3- • 4294967295Methylene, difluoro-) + Methylene, difluoro- = CF3-

By formula: (CF3- • 4294967295CF2) + CF2 = CF3-

Quantity Value Units Method Reference Comment
Δr49.8 ± 2.4kcal/molN/ADeyerl, Alconcel, et al., 2001gas phase; Adiabatic EA, from vibrational structure of spectrum
Δr50.9 ± 2.9kcal/molN/ABartmess, Scott, et al., 1979gas phase; Paulino and Squires, 1991 suggests that this acidity may be too weak by ca. 5 kcal/mol. However, G2 calcn(JEB) give ΔHacid=379.9, ΔGacid=372.0; value altered from reference due to change in acidity scale
Δr55.9 ± 2.7kcal/molCIDTPaulino and Squires, 1991gas phase; Neutral heat is based on a fluoroform acidity that may be too weak by up to 5 kcal/mol

(CAS Reg. No. 53959-80-1 • 4294967295Methylene, difluoro-) + Methylene, difluoro- = CAS Reg. No. 53959-80-1

By formula: (CAS Reg. No. 53959-80-1 • 4294967295CF2) + CF2 = CAS Reg. No. 53959-80-1

Quantity Value Units Method Reference Comment
Δr<8.00kcal/molCIDTPaulino and Squires, 1991, 2gas phase; Probably CF2..Cl-, non-covalent.

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.

Deyerl, Alconcel, et al., 2001
Deyerl, H.J.; Alconcel, L.S.; Continetti, R.E., Photodetachment imaging studies of the electron affinity of CF3, J. Phys. Chem. A, 2001, 105, 3, 552-557, https://doi.org/10.1021/jp003137k . [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]

Paulino and Squires, 1991
Paulino, J.A.; Squires, R.R., Carbene Thermochemistry from Collision-Induced Dissociation Threshold Energy Measurements - The Heats of Formation of X1A1 CF2 and X1A1 CCl2, J. Am. Chem. Soc., 1991, 113, 15, 5573, https://doi.org/10.1021/ja00015a009 . [all data]

Paulino and Squires, 1991, 2
Paulino, J.A.; Squires, R.R., Carbene Anion Complexes - Unusual Structural and Thermochemical Features of alpha-Halocarbanions in the Gas Phase, J. Am. Chem. Soc., 1991, 113, 5, 1845, https://doi.org/10.1021/ja00005a067 . [all data]


Notes

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