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

Reach Us reach to JOCPR whatsapp-JOCPR +44 1625708989
All submissions of the EM system will be redirected to Online Manuscript Submission System. Authors are requested to submit articles directly to Online Manuscript Submission System of respective journal.

Original Articles: 2015 Vol: 7 Issue: 3

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


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.

rtp slot demo