Quantitative HPLC Analysis and Thermodynamics of Sulfur Melts

The quantitative composition of quenched sulfur melts, which had been equilibrated at 116–387°C, was determined by HPLC analysis. The melts contain ring molecules from S6 to S23. From the temperature dependence of the equilibrium constants Kc=[Sn]/[S8]n/8, the enthalpies ΔH of the 18 equilibrium reactions (1) were calculated. These are the first thermodynamic data for sulfur molecules containing more than ten atoms.