Abstract
Heat capacities and enthalpy increments between the temperatures T = 10 K and 445 K were determined for 2,4-dimethylpyrrole by adiabatic calorimetry. (Chemical Abstract registry number [625-82-1].) The triple-point temperature and enthalpy of fusion are reported, and enthalpies and entropies relative to those of the crystals at T → 0 were derived. No crystal-to-crystal phase transitions or anomalies were observed. Heat capacities for the supercooled liquid were determined between the glass transition and triple-point temperatures. Barriers to methyl-group rotation in the solid state for 2,4-dimethylpyrrole and 2,5-dimethylpyrrole were estimated by comparison of the heat capacities of the crystals for 2,4-dimethylpyrrole with literature values for 2,5-dimethylpyrrole.
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