Heat capacity and thermodynamic properties of pyrimethanil myristic salt (C_(26)H_(41)N_3O_2)

摘要

Pyrimethanil myristic salt was synthesized and its heat capacities were measured with an automated adiabatic calorimeter over the temperature range from T=(79 to 360) K.The melting point,molar enthalpy,DELTA_(fus)H_m and entropy,DELTA_(fus)S_m,of fusion of this compound were determined to be (321.84+-0.05) K,(56.53+-0.03) kJ·mol~(-1) and (175.64+-0.05) J·mol~(-1)·K~(-1),respectively.The purity of the compound was calculated to be 98.99 mol% by using the fractional melting technique.The thermodynamic functions relative to the reference temperature,T=298.15 K,were calculated based on the heat capacity measurements in the temperature ranges from T=(80 to 360) K.The TG-DTG results demonstrate that the mass loss of the sample takes place in one step with the maximum rate at T=500 K,which was caused by evaporation of the sample.