Authors: Marcelo Kobelnik Clóvis A Ribeiro Diógenes dos Santos Dias Sonia de Almeida Marisa Spirandeli Crespi Jorge M V Capela
Publish Date: 2010/12/19
Volume: 105, Issue: 2, Pages: 467-471
Abstract
The CoII–diclofenac complex was evaluated by simultaneous thermogravimetrydifferential thermal analysis TGDTA and differential scanning calorimetry DSC The DTA curve profile shows one exothermic peak because of the transition phase of the compound between 170 and 180 °C which was confirmed by Xray powder diffractometry The transition phase behavior was studied by DSC curves at several heating rates of a sample mass between 1 and 10 mg in nitrogen atmosphere and in a crucible with and without a lid Thus the kinetic parameters were evaluated using an isoconversional nonlinear fitting proposed by Capela and Ribeiro The results show that the activation energy and preexponential factor for the transition phase is dependant on the different experimental conditions Nevertheless these results indicate that the kinetic compensation effect shows a relationship between them
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