Synthesis and Thermodynamic Characteristics of Molybdenum Carboxylates Мо₂((СH₃)₃CCOO)₄, Мо₂(СF₃COO)₄, and МоО₂((СH₃)₃CCOO)₂

Dimolybdenum tetratrimethylacetate (tetrapivalate) and tetratrifluoroacetate are synthesized, and their evaporation is studied by the Knudsen effusion method with mass spectral analysis of the gas phase. The standard enthalpies of formation of crystalline and gaseous Мо₂(СF₃COO)₄ are estimated for the first time by the study of dissociative ionization. The solid-phase reactions of silver pivalate (CН₃)₃СCOOAg with molybdenum are studied by thermography (TG), differential scanning calorimetry (DSC), and mass spectrometry. The reaction in a temperature range of 410–480 K affords molybdenum oxopivalate МоО₂Piv₂. The obtained experimental data make it possible to estimate the standard enthalpy of formation of this compound: \({{\Delta }_{f}}H_{{298}}^{^\circ }\) (МоО₂Рiv₂, cr) = –1476 kJ/mol.