Enthalpies of formation of [M(η-C5H5)2(OOCR)2] complexes; M = Mo, W, or Ti and R = C6H5 or CF3
Abstract
The standard enthalpies of formation of the title crystalline solids at 298.15 K have been determined by reaction–solution calorimetry. The results gave ΔHf⊖{[Mo(η-C5H5)2(OOCC6H5)2], c}=–486.2 ± 3.4, ΔHf⊖{[Mo(η-C5H5)2(OOCCF3)2], c}=–1 952.0 ± 3.9, ΔHf⊖{[W(η-C5H5)2(OOCC6H5)2], c}=–448.9 ± 3.5, ΔHf⊖{[W(η-C5H5)2(OOCCF3)2], c}=–1 914.5 ± 3.8, ΔHf⊖{[Ti(η-C5H5)2(OOCC6H5)2], c}=–775.2 ± 8.1, and ΔHf⊖{[Ti(η-C5H5)2(OOCCF3)2], c}=–2 219.0 ± 8.0 kJ mol–1. The metal–oxygen mean bond-enthalpy contributions have been derived as ![[D with combining macron]](https://www.rsc.org/images/entities/i_char_0044_0304.gif)
(Mo–OOCC6H5)≈ 305, (W–OOCC6H5)≈ 342, (Ti–OOCC6H5)≈ 432, (Mo–OOCCF3)≈ 300, (W–OOCCF3)≈ 337, and (Ti–OOCCF3)≈ 417 kJ mol–1.
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