Thermodynamics of 4,4'-Bipyridine in the Range 0-33 K

摘要

The temperature depenence of the heat capacity of 4,4'-bipyridine in the range 5-330 K was studied in an adiabatic vacuum calorimeter with an accuracy of approx 0.2%. The energy of burning of 4,4'-bipyridine at 298.15 K was measured in a calorimeter with an isothermic shell and a static bomb with an accuracy of 0.02%. The thermodynamic functions H~-(T)-H~0(O), S~O(T), and G~0(T)-H~0(O) were calculated for the range 0-330 K, as well as the standard enthalpy of burning #DELTA#_bH~0, the enthalpy #DELTA#_fH~0, the entropy #DELTA#_fS~0, the Gibbs energy #DELTA#_fG~0, and the logarithm of the thermodynamic equilibrium constant log K_f of 4,4'-bipyridine formation from simple substances at 298.15 K and standard pressure.