Optically clear crystals ofresorcinal [C 6 H 4 (OHh] were grown and employed in the Raman and calorimetric studies of the phase transitions. The enthalpy and entropy change for the solid-solid (a-{3) phase transition at 369 ± 6 K are 1.370 ± 0.007 kJ mol-I and 3.71 ± 0.05 J K-I mol-I, respectively. The slope (dp/dn of the a-{3phase boundary at 1 atm is negative ( -16.7 atm K -I ). The characteristic Raman features of the a-/3 transition are the disappearance of the librational mode at 102 cm -1 and one of the O-H stretching modes at 3060 cm -I (298 K and 1 atm), while other vibrations remain continuous in both phases. The pressure induced a-{3 phase transition at room temperature was observed in a diamond anvil cell at 5 k.bar. The enthalpy of fusion of tJ-resorcinal at 382.8 K is 20.89 ± 0.07 kJ mol-, and the entropy change is 54.59 ± 0.18 J K -I mol-'.
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