Thermodynamics of 4,4 '-bipyridine in the range 0-330 K

The temperature dependence of the heat capacity of 4,4'-bipyridine in the r ange 5-330 K was studied in an adiabatic vacuum calorimeter with an accurac y of similar to0.2%. The energy of burning of 4,4'-bipyridine at 298.15 K w as measured in a calorimeter with an isothermic shell and a static bomb wit h an accuracy of 0.02%. The thermodynamic functions H-0(T)-H-0(0), S-0(T), and G(0)(T)-H-0(0) were calculated for the range 0-330 K, as well as the st andard enthalpy of burning Delta H-b(0), the enthalpy Delta H-f(0), the ent ropy Delta S-f(0), the Gibbs energy Delta (f)G(0), and the logarithm of the thermodynamic equilibrium constant log Kf of 4,4'-bipyridine formation fro m simple substances at 298.15 K and standard pressure.