Heat capacity and thermodynamic properties of diamantane from 5 to 540 K

Abstract

The heat capacity of diamantane, C14H20, has been measured by adiabatic calorimetry from 5 to 350 K. The heat capacity is generally sigmate except for a gradual thermal anomaly with a maximum at 35.7 K and an apparent entropy increment of only 0.8 calth K-1 mol-1. No explanation of the mechanism of the anomaly is provided. The values of Cp, So, and {Go(T)-Go(0)}/T at 298.15 K are 53.35, 47.84, and -23.60 calth K-1 mol-1. Thermodynamic properties to 540 K are included. [Delta]Gfo(c, 298.15 K) is 26.71 kcalth mol-1.