Abstract
Heat capacities of [C6H4(OH)2]3·(H2S) x were measured between 1 and 15 K. Heat capacity peaks were found at (7.56±0.09) K, (7.61±0.05) K, and (7.65±0.07) K for the compounds withx=0.92, 0.95, and 0.96. A weak anomaly was observed around 6.75 K for the compound withx=0.85. The temperatures of these anomalies are unusually low among the phase transitions of molecular crystals. The decrease of the transition temperature from that of crystalline H2S (=103.52 K) is a clear indication of the effect of enclathration on the molecular interaction. A comparison of the rotational heat capacity of the trapped hydrogen sulfide molecules with that of crystalline hydrogen sulfide shows that the trapped hydrogen sulfide molecules have a large rotational freedom at low temperatures (∼13 K). This agrees with the results from far infrared spectroscopic data. The dielectric constant of the clathrate compound obeyed the Curie-Weiss law above 30 K and no significant dielectric loss was found over the whole temperature range. These results showed that the trapped hydrogen sulfide molecules execute free rotation or are orientationally disordered above ∼20 K.
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Dedicated to Professor H. M. Powell.
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Ukegawa, H., Matsuo, T. & Suga, H. Phase transitions in the hydroquinone hydrogen sulfide clathrate compound. Journal of Inclusion Phenomena 3, 261–267 (1985). https://doi.org/10.1007/BF00655729
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DOI: https://doi.org/10.1007/BF00655729