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

The standard (p0 = 0.1 MPa) molar enthalpies of formation of crystalline bis(dibenzoylmethanate)zinc(II), Zn(DBM)2, diaquobis(thenoyltrifluoroacetonate)zinc(II), Zn(TTFA)2(H2O)2, bis(monothiodibenzoylmethanate)zinc(II), Zn(HDBMS)2, and bis(monothio-thenoyltrifluoroacetonate)zinc(II), Zn(HTTFAS)2, were determined, at T = 298.15 K, by high precision solution-reaction calorimetry. The standard molar enthalpy of dehydration of the diaquobis(thenoyltrifluoroacetonate)zinc(II), Zn(TTFA)2(H2O)2, complex was 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 zinc(II)-ligand, (Zn-L), were derived