Thermodynamic Properties of Triphenylbismuth Dibenzoate Ph3Bi(OC(O)Ph)2 and Triphenylantimony Dibenzoate Ph3Sb(OC(O)Ph)2

The temperature dependence of the heat capacity of triphenylbismuth dibenzoate Ph3Bi(OC(O)Ph)2 is measured for the first time in the range of Т = (6 and 480) K using precision adiabatic vacuum and differential scanning calorimeters. It is found that the melts with decomposition in the considered range of temperatures, and its standard thermodynamic characteristics are analyzed. Standard thermodynamic functions of Ph3Bi(OC(O)Ph)2 in the crystalline state from Т → 0 to 417 K are calculated using the obtained experimental data. The chain-planar topological structure of the compound is established by subjecting the low-temperature heat capacity to multifractal treatment. The data are used to determine w the compound’s standard entropy of formation ∆fS° in the crystal state at T = 298.15 K. The thermodynamic properties of triphenylbismuth dibenzoate and triphenylantimony dibenzoate are compared, as are the compounds’ thermodynamic characteristics of fusion.