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High pressure study of solid cyclopentane

1976; Elsevier BV; Volume: 37; Issue: 3 Linguagem: Inglês

10.1016/0022-3697(76)90102-5

1879-2553

D.S. Webster, M. J. R. Hoch,

Crystallography and molecular interactions

The phase behaviour of solid cyclopentanone, cyclopentanol, and cyclohexanone was investigated from 80 K to the melting temperature and up to 3 Kbar, using a low-temperature high-pressure differential thermal analysis apparatus. The melting temperature of cyclopentanone rises from 221.7 K at atmospheric pressure to 278 K at 2900 bar. No solid solid transition was observed. The melting temperature of cyclohexanone rises from 242.4 K at atmospheric pressure to 312 K at 2840 bar. Its well-known solid solid transition at atmospheric pressure (220.3 K) splits into two different solid solid transitions at elevated pressures. The melting temperature of cyclopentanol rises from 256 K at atmospheric pressure to 328 K at 2600 bar. Cyclopentanol exhibits two well-known solid solid transitions (236.4 K and 202.5 K at 1 atm), but an additional metastable form has been observed in the present work. the transition temperature being 195 K at 1 atm. Volume changes accompanying the phase transitions have been calculated using the Clausius Clapeyron equation.