Thermal properties of some cyclic disulfides: naphthalene disulfide and diphenylene disulfide

Abstract

The specific heat, the melting heat and entropy, the vaporization heat of naphtalene disulfide (C 10H 6S 2) and of diphenylene disulfide (C 12H 8S 2) have been determined by differential scanning calorimetry (DSC). Over the temperature range examined the specific heat may be represented as follows: ▪ where T is the temperature in degrees Kelvin, while melting heat, vaporization heat, melting entropy are for naphtalene disulfide: 3.10 kcal mol −1, 6.42 kcal mol −1, 7.87 cal deg − mol −1 and for diphenylene disulfide: 4.62 kcal mol −1, 6.90 kcal mol −1 and 11.87 cal deg −1 mol −1.