Journal of Chemical Thermodynamics p. 687 - 699 (1997)
Update date:2022-08-11
Topics:
Maksimuk
Kabo
Kozyro
Simirsky
Krasulin
Sevruk
A comprehensive study of thermodynamic properties of trans-2-cyclohexylcyclohexanol (t-2CCOL) was carried out in this work. The subject compound is a by-product from the synthesis of 2-phenylphenol. The standard molar enthalpy of combustion of t-2CCOL, found by the bomb calorimetry method, ΔcHom(cr,298.15 K) = - (7388.05 ± 1.37) kJ·mol-1, and the standard molar enthalpy of formation ΔfHom(cr,298.5 K) = - (478.25 ± 2.13) kJ·mol-1. The molar sublimation and vaporization enthalpies of t-2CCOL were measured with a heat-conduction differential microcalorimeter: ΔgcrHom(319.5 K) = (98.56 ± 0.52) kJ·mol-1; ΔgJHom(345.8 K) = (80.31 ± 0.34) kJ·mol-1. Vapour pressure of t-2CCOL was measured by the integral effusion Knudsen method in the temperature range 293 K to 325 K for crystal: ln(p/Pa) = (37.30 ± 0.22) - (11616 ± 69)·T-1, and in the temperature range 328 K to 364 K for liquid: ln(p/Pa) = (34.41 ± 0.44) - (10013 + 150)·T-1. The heat capacity of t-2CCOL was measured by the vacuum adiabatic calorimetry (T = 5 K to T = 338 K). The fusion temperature of t-2CCOL is 325.8 K, and the molar enthalpy of fusion is ΔfusHom = (14.515 ± 0.029) kJ·mol-1. Standard molar thermodynamic functions of t-2CCOL in the crystalline state at T = 298.15 K were obtained on the basis of these measurements: Cop,m = (248.68 ± 0.99); ΔT0Som = (263.85 ± 1.18); ΔT0Hom/T = (130.52 ± 0.51); Φom = (133.33 ± 1.29) J·K-1·mol-1.
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