Thermodynamic properties of triphenylantimony dipropionate Ph3Sb(OC(O)C2H5)2 over the range from T → 0 to 430 K

In the present research, the temperature dependence of heat capacity Cp,mo=f(T) of crystalline triphenylantimony dipropionate Ph3Sb(OC(O)C2H5)2 has been measured between T = (5 and 430) K in the precision adiabatic vacuum and differential scanning calorimeters and reported for the first time. In the studied temperature region the melting of the compound has been identified and its standard thermodynamic characteristics were analyzed. The standard thermodynamic functions (p° = 0.1 MPa) of Ph3Sb(OC(O)C2H5)2 in crystalline and liquid states were calculated with the obtained experimental data: Cp,mo/R , Δ0THmo/RT, Δ0TSmo/R and Φmo=Δ0TSmo-Δ0THmo/T (where R is the universal gas constant) from T → 0 to 430 K. The standard entropy of formation of compound in the crystalline state was determined at T = 298.15 K. Also isochoric heat capacity was calculated as its atomic and lattice contributions were estimated.