FCH2CO2 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

FCH2CO2 anion + Hydrogen cation = Fluoroacetic acid

By formula: C2H2FO2- + H+ = C2H3FO2

Quantity Value Units Method Reference Comment
Δr1418. ± 9.2kJ/molG+TSCaldwell, Renneboog, et al., 1989gas phase; B
Δr1417. ± 9.2kJ/molG+TSFujio, McIver, et al., 1981gas phase; value altered from reference due to change in acidity scale; B
Δr1416. ± 12.kJ/molG+TSCumming and Kebarle, 1978gas phase; B
Quantity Value Units Method Reference Comment
Δr1387. ± 8.4kJ/molIMRECaldwell, Renneboog, et al., 1989gas phase; B
Δr1386. ± 8.4kJ/molIMREFujio, McIver, et al., 1981gas phase; value altered from reference due to change in acidity scale; B
Δr1385. ± 8.4kJ/molIMRECumming and Kebarle, 1978gas phase; B

(FCH2CO2 anion • 2Water) + Water = (FCH2CO2 anion • 3Water)

By formula: (C2H2FO2- • 2H2O) + H2O = (C2H2FO2- • 3H2O)

Bond type: Hydrogen bond (negative ion to hydride)

Quantity Value Units Method Reference Comment
Δr48.5 ± 6.3kJ/molTDAsBlades, Klassen, et al., 1995gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K; B
Quantity Value Units Method Reference Comment
Δr19.2 ± 1.3kJ/molTDAsBlades, Klassen, et al., 1995gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K; B,M

(FCH2CO2 anion • Water) + Water = (FCH2CO2 anion • 2Water)

By formula: (C2H2FO2- • H2O) + H2O = (C2H2FO2- • 2H2O)

Bond type: Hydrogen bond (negative ion to hydride)

Quantity Value Units Method Reference Comment
Δr54.0 ± 6.3kJ/molTDAsBlades, Klassen, et al., 1995gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K; B
Quantity Value Units Method Reference Comment
Δr24.7 ± 1.3kJ/molTDAsBlades, Klassen, et al., 1995gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K; B,M

FCH2CO2 anion + Water = (FCH2CO2 anion • Water)

By formula: C2H2FO2- + H2O = (C2H2FO2- • H2O)

Bond type: Hydrogen bond (negative ion to hydride)

Quantity Value Units Method Reference Comment
Δr64.0 ± 6.3kJ/molTDAsBlades, Klassen, et al., 1995gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K; B
Quantity Value Units Method Reference Comment
Δr34.7 ± 1.3kJ/molTDAsBlades, Klassen, et al., 1995gas phase; T: 293 K. ΔSaff approx. 24 cal/mol-K; B,M

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

Electron affinity of neutral species

EAneutral (eV) Method Reference Comment
3.800 ± 0.030LPESYu, Lina, et al., 2007Vertical Detachment Energy: 3.96±0.03 eV
3.80 ± 0.16D-EACaldwell, Renneboog, et al., 1989 

Protonation reactions

FCH2CO2 anion + Hydrogen cation = Fluoroacetic acid

By formula: C2H2FO2- + H+ = C2H3FO2

Quantity Value Units Method Reference Comment
Δr1418. ± 9.2kJ/molG+TSCaldwell, Renneboog, et al., 1989gas phase
Δr1417. ± 9.2kJ/molG+TSFujio, McIver, et al., 1981gas phase; value altered from reference due to change in acidity scale
Δr1416. ± 12.kJ/molG+TSCumming and Kebarle, 1978gas phase
Quantity Value Units Method Reference Comment
Δr1387. ± 8.4kJ/molIMRECaldwell, Renneboog, et al., 1989gas phase
Δr1386. ± 8.4kJ/molIMREFujio, McIver, et al., 1981gas phase; value altered from reference due to change in acidity scale
Δr1385. ± 8.4kJ/molIMRECumming and Kebarle, 1978gas phase

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.

Caldwell, Renneboog, et al., 1989
Caldwell, G.; Renneboog, R.; Kebarle, P., Gas Phase Acidities of Aliphatic Carboxylic Acids, Based on Measurements of Proton Transfer Equilibria, Can. J. Chem., 1989, 67, 4, 661, https://doi.org/10.1139/v89-092 . [all data]

Fujio, McIver, et al., 1981
Fujio, M.; McIver, R.T., Jr.; Taft, R.W., Effects on the acidities of phenols from specific substituent-solvent interactions. Inherent substituent parameters from gas phase acidities, J. Am. Chem. Soc., 1981, 103, 4017. [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]

Blades, Klassen, et al., 1995
Blades, A.T.; Klassen, J.S.; Kebarle, P., Free Energies of Hydration in the Gas Phase on the Anions of Some Oxo Acids of C, N, S, P, Cl and I, J. Am. Chem. Soc., 1995, 117, 42, 10563, https://doi.org/10.1021/ja00147a019 . [all data]

Yu, Lina, et al., 2007
Yu, W.B.; Lina, Z.J.; Ding, C.F., Electronic structures and electron detachment energies of halogen substituted acetate anions, XCH2COO- (X=F, Cl, Br), J. Chem. Phys., 2007, 126, 11, 114301, https://doi.org/10.1063/1.2646665 . [all data]


Notes

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