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Chromium, hexacarbonylbis(«eta»5-2,4-cyclopentadien-1-yl)di-, (Cr-Cr)


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

Chromium, hexacarbonylbis(η5-2,4-cyclopentadien-1-yl)di-, (Cr-Cr) (cr) + Hydrogen (g) = 2C8H6CrO3 (cr)

By formula: C16H10Cr2O6 (cr) + H2 (g) = 2C8H6CrO3 (cr)

Quantity Value Units Method Reference Comment
Deltar-13.9 ± 4.0kJ/molRSCLandrum and Hoff, 1985The reaction enthalpy was obtained from the value for the reaction 2Cr(Cp)(CO)3(H)(cr) + 1,3-cy-C6H8(solution) = [Cr(Cp)(CO)3]2(cr) + cy-C6H10(solution), -98.3 ± 3.8 kJ/mol Landrum and Hoff, 1985, together with the calculated enthalpy for 1,3-cy-C6H8(l) + H2(g) = cy-C6H10(l), -112.2±1.3 Pedley, 1994. It was assumed that 1,3-cy-C6H8 and cy-C6H10 have similar solution enthalpies in heptane
Deltar-15.1 ± 4.2kJ/molDSCLandrum and Hoff, 1985The reaction enthalpy was obtained from the value for the reaction 2Cr(Cp)(CO)3(H)(cr) + 1,3-cy-C6H8(solution) = [Cr(Cp)(CO)3]2(cr) + cy-C6H10(solution), -98.3 ± 3.8 kJ/mol Landrum and Hoff, 1985, together with the calculated enthalpy for 1,3-cy-C6H8(l) + H2(g) = cy-C6H10(l), -112.2±1.3 Pedley, 1994. It was assumed that 1,3-cy-C6H8 and cy-C6H10 have similar solution enthalpies in heptane

0.5Chromium, hexacarbonylbis(η5-2,4-cyclopentadien-1-yl)di-, (Cr-Cr) (solution) + sodium (cr) = C8H5CrNaO3 (solution)

By formula: 0.5C16H10Cr2O6 (solution) + Na (cr) = C8H5CrNaO3 (solution)

Quantity Value Units Method Reference Comment
Deltar-285.1 ± 3.6kJ/molRSCKiss, Nolan, et al., 1994solvent: Tetrahydrofuran; The reaction enthalpy was calculated from the enthalpies of the following reactions: 0.5[Cr(Cp)(CO)3]2(solution) + (Na)[Cr(Cp)(CO)2(PPh3)](solution) = (Na)[Cr(Cp)(CO)3](solution) + Cr(Cp)(CO)2(PPh3)(solution), -34.9 ± 0.4 kJ/mol, Cr(Cp)(CO)2(PPh3)(solution) + (Na)(Ph2CO)(solution) = (Na)[Cr(Cp)(CO)2(PPh3)](solution) + Ph2CO(solution), -89.1 ± 2.5 kJ/mol, and Ph2CO(solution) + Na(cr) = (Na)(Ph2CO)(solution), -161.1 ± 2.5 kJ/mol Kiss, Nolan, et al., 1994.

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.

Landrum and Hoff, 1985
Landrum, J.T.; Hoff, C.D., J. Organometal. Chem., 1985, 282, 215. [all data]

Pedley, 1994
Pedley, J.B., Thermodynamic Data and Structures of Organic Compounds; Thermodynamics Research Center Data Series, Vol I, Thermodynamics Research Center, College Station, 1994. [all data]

Kiss, Nolan, et al., 1994
Kiss, G.; Nolan, S.P.; Hoff, C.D., Inorg. Chim. Acta, 1994, 227, 285. [all data]


Notes

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