Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2015 Vol: 7 Issue: 3

Thermal studies of some biologically active new aryl esters of 1,1?¢????-bis(4-hydroxyphenyl)cyclohexane

Abstract

Thermal study of some biologically active aryl esters of bisphenol-C derivatives have been investigated using TG and DSC techniques under nitrogen atmosphere at the heating rate of 10ºC min-1. The nature and position of the substituents affected DSC transitions, thermal stability and kinetic parameters. DSC curves of all compounds showed endothermic transitions in the range 120-2570C and corresponding enthalpy change (ΔH) in the range 18- 58 kJmol-1. Aryl esters are thermally stable up to about 215-3750C and followed either a single or two steps degradation kinetics due to structural dissimilarity. They followed either fractional or integral order degradation kinetics. Different magnitudes of n, Ea and A suggested different degradation mechanisms. A large and negative magnitudes of ΔS* confirmed highly ordered transition states, while a large and positive magnitudes of ΔS*confirmed less ordered transition states.

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