The thermodynamic function data, including total energy ET, enthalpy H°, entropy S°, free energy G°, zero-point vibration energy EZPV, constant volume molar heat capacity CV° and thermal energy correction Eth for 218 polychlorinated biphenyls (PCB), were predicted by fully optimized calculation at the B3LYP/6-31G* level. In addition, the dependence of these thermodynamic parameters on the number and the position of chlorine substitute was discussed. It was suggested that the total energy, enthalpy and free ...