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Issue 11, 1979
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Standard enthalpies of formation of the tetra-µ-acetato-derivatives of dimolybdenum(II), chromium(II)–molybdenum(II), dichromium(II), and dichromium(II) dihydrate, and di-µ-acetato-bis(pentane-2,4-dionato)dimolybdenum(II), and their metal–metal bond enthalpy contributions

Abstract

The following standard enthalpies (kJ mol–1) of formation of the crystalline solids at 298.15 K have been determined using solution reaction calorimetry: ΔHt[Mo2(O2CMe)4c]=–1 970.7 ± 8.4, ΔHt[CrMo(O2CMe)4,c]=–2 113.9 ± 6.4, ΔHt[Cr2(O2CMe)4,c]=–2 297.5 ± 6.6, ΔHt[Cr2(O2CMe)4.2H2O,c]=–2 875.4 ± 6.7, and ΔHt[Mo2(O2CMe)2(pd)2,c](pd = pentane-2,4-dionate)=–1 805.0 ± 8.9. The corresponding metal–metal bond enthalpy contributions in the gaseous species have been assessed as D[> with combining macron](Mo–Mo)= 334, D[> with combining macron](Cr–Mo)= 249, and D[> with combining macron](Cr–Cr)= 205 kJ mol–1. The bond enthalpy contribution for the co-ordination of each water molecule in [Cr2(O2CMe)4]·2H2O has been estimated as 44 kJ mol–1.

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J. Chem. Soc., Dalton Trans., 1979, 1714-1717
Article type
Paper

Standard enthalpies of formation of the tetra-µ-acetato-derivatives of dimolybdenum(II), chromium(II)–molybdenum(II), dichromium(II), and dichromium(II) dihydrate, and di-µ-acetato-bis(pentane-2,4-dionato)dimolybdenum(II), and their metal–metal bond enthalpy contributions

K. J. Cavell, C. D. Garner, G. Pilcher and S. Parkes, J. Chem. Soc., Dalton Trans., 1979, 1714
DOI: 10.1039/DT9790001714

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