Abstract
In the present research, the heat capacities of triphenylbismuth dimethacrylate Ph3Bi(O2CCMe═CH2)2 were measured between T = 5.3 and 330 K with the precision adiabatic vacuum calorimeter and from T = 310 to 420 K with the differential scanning calorimeter. There revealed a reproducible anomaly from 150 to 170 K caused by structural changes in the crystal lattice, and intensive exothermic transition over the range from T = 385 to 420 K caused by the reductive decomposition with the polymerization of the sample under study. The experimental results were used to calculate the standard (p = 0.1 MPa) thermodynamic functions (heat capacity Cp,mo, enthalpy Hmo(T) – Hmo(0), entropy Smo(T), and Gibbs energy Φmo(T) of crystalline triphenylbismuth dimethacrylate from T → 0 to 385 K. The standard entropy of formation at T = 298.15 K was calculated for the compound under study in the crystalline state. Obtained for Ph3Bi(O2CCMe═CH2)2 results were compared with ones for Ph3Sb(O2CCMe═CH2)2.
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