Abstract
The low-temperature thermal properties of three dimethylindans (1,1; 4,6; and 4,7) and two tetramethylindans (1,1,4,6 and 1,1,4,7) were measured by adiabatic calorimetry from 10 to about 400 K. Properties measured included the heat capacity of the condensed phases at saturation pressure, enthalpy of fusion, triple-point temperature, and purity of sample. The 1,1,4,6-tetramethylindan exhibited a lambda transition with a peak at 191 K. The 1,1,4,7 sample formed a glass when cooled rapidly from the liquid. The glass was studied from 10 K to the transition temperature (about 160 K). The results were used to calculate thermodynamic functions at selected temperature for the condensed phases −{G 3(T)−H°(0)} T , {H 3(T)−H°(0)} T , {H s(T)−H°(0)},S s, C s, and the thermodynamic functions for the ideal gas.
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