Fe(Cp)(CO)2


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: José A. Martinho Simões

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Individual Reactions

C7H6FeO2 (solution) = C7H5FeO2 (solution) + Hydrogen atom (solution)

By formula: C7H6FeO2 (solution) = C7H5FeO2 (solution) + H (solution)

Quantity Value Units Method Reference Comment
Δr57.1 ± 1.0kcal/molEChemParker, Handoo, et al., 1991solvent: Acetonitrile; Please also see Tilset and Parker, 1989. The reaction enthalpy was obtained from the pKa of the hydride complex (MH), 19.4, and from the oxidation potential of the anion (M-), Fe(Cp)(CO)2(-), by using the equation: ΔHrxn [kJ/mol] = 5.71pKa(MH) + 96.485(Eo)ox(M-) + C. C is a constant that was calculated as 59.49 kcal/mol Parker, Handoo, et al., 1991, by adjusting the previous equation to the calorimetrically derived values for the reactions Cr(Cp)(CO)3(H)(solution) = Cr(Cp)(CO)3(solution) + H(solution), 61.5 ± 1.0 kcal/mol, and Cr(Cp)(CO)2(PPh3)(H)(solution) = Cr(Cp)(CO)2(PPh3)(solution) + H(solution), 59.8 ± 1.0 kcal/mol Kiss, Zhang, et al., 1990. C depends on the solvent and on the reference electrode. The value given implies that the electrode potentials are referenced to ferrocene/ferricinium electrode

C14H10Fe2O4 (solution) = 2C7H5FeO2 (solution)

By formula: C14H10Fe2O4 (solution) = 2C7H5FeO2 (solution)

Quantity Value Units Method Reference Comment
Δr>23.5kcal/molES/EChemPugh and Meyer, 1988solvent: Acetonitrile; The lower limit is the reaction Gibbs energy
Δr23.kcal/molKinSCutler and Rosenblum, 1976solvent: Benzene; The reaction enthalpy was derived from the activation enthalpy of the disproportionation reaction [Fe(Cp)(C5H4COMe)(CO)2]2(solution) = 0.5[Fe(Cp)(CO)2]2(solution) + 0.5[Fe(C5H5COMe)(CO)2]2(solution), 26.9 ± 2.7 kcal/mol, whose rate-determining step corresponds to Fe-Fe cleavage after isomerization of the complex with two bridging carbonyls to a "linear" (no bridging carbonyls) structure Cutler and Rosenblum, 1976. The enthalpy of this isomerization was estimated as 4.1 kcal/mol Cutler and Rosenblum, 1976

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.

Parker, Handoo, et al., 1991
Parker, V.D.; Handoo, K.L.; Roness, F.; Tilset, M., J. Am. Chem. Soc., 1991, 113, 7493. [all data]

Tilset and Parker, 1989
Tilset, M.; Parker, V.D., J. Am. Chem. Soc., 1989, 111, 6711; ibid. 1990. [all data]

Kiss, Zhang, et al., 1990
Kiss, G.; Zhang, K.; Mukerjee, S.L.; Hoff, C.; Roper, G.C., J. Am. Chem. Soc., 1990, 112, 5657. [all data]

Pugh and Meyer, 1988
Pugh, J.R.; Meyer, T.J., J. Am. Chem. Soc., 1988, 110, 8245. [all data]

Cutler and Rosenblum, 1976
Cutler, A.R.; Rosenblum, M., J. Organometal. Chem., 1976, 120, 87. [all data]


Notes

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