Standard molar enthalpies of formation of copper(II) β-diketonates and monothio-β-diketonates

The standard (p∘ = 0.1 MPa) molar enthalpies of formation of the crystalline complexes of dibenzoylmethane (Hdbm), thenoyltrifluoroacetone (Httfa), monothiodibenzoylmethane (HdbmS), and monothiothenoyltrifluoroacetone (HttfaS) of copper(II) were determined, at T = 298.15 K, by high precision solution-reaction calorimetry. The standard molar enthalpies of sublimation of the copper(II) β-diketonate complexes were measured by high-temperature Calvet microcalorimetry. From the standard molar enthalpies of formation of the complexes in the gaseous state, the mean molar dissociation enthalpies copper(II)–ligand, 〈Dm〉(Cu–L), were derived. ΔfHm∘(cr)ΔcrgHm∘kJ · mol−1kJ · mol−1Bis(dibenzoylmethanate)copper(II), Cu(dbm)2−364.0 ± 3.9230.7 ± 8.2Bis(thenoyltrifluoroacetonate)copper(II), Cu(ttfa)2−1824.3 ± 8.3167.9 ± 7.4Bis(monothiodibenzoylmethanate)copper(II), Cu(dbmS)235.6 ± 7.7[241 ± 15]Bis(monothiothenoyltrifluoroacetonate)copper(II), Cu(ttfaS)2−1405.7 ± 8.3[177 ± 15]Full-size tableTable optionsView in workspaceDownload as CSV