Thermodynamic Studies of Orientational Disorder in π-π Molecular Compounds: 1. Heat Capacities of Naphthalene-Tetracyanobenzene

Abstract

The heat capacity of the π-π molecular compound naphthalene-tetracyanobenzene has been determined from 5 to 300 K. A small anomaly was observed in the heat capacity near 75 K with an entropy of transition of 0.71 cal_th K⁻¹ mol⁻¹. It is believed to arise from an order-disorder transition involving the reorientation of the naphthalene molecules. The smoothed thermodynamic functions have been reported at selected temperatures over the region from 5 to 300 K.