Study of the thermal behavior of the transition phase of Co(II)-diclofenac compound by non-isothermal method
Nenhuma Miniatura disponível
Data
2011-08-01
Autores
Kobelnik, Marcelo
Ribeiro, Clovis Augusto [UNESP]
Dias, Diogenes dos Santos [UNESP]
de Almeida, Sonia [UNESP]
Crespi, Marisa Spirandeli [UNESP]
Capela, Jorge Manual Vieira [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Springer
Resumo
The Co(II)-diclofenac complex was evaluated by simultaneous thermogravimetry-differential thermal analysis (TG-DTA) 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 A degrees C, which was confirmed by X-ray 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 non-linear fitting proposed by Capela and Ribeiro. The results show that the activation energy and pre-exponential 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.
Descrição
Palavras-chave
Co(II)-diclofenac, DSC, Transition phase, Non-isothermal kinetic
Como citar
Journal of Thermal Analysis and Calorimetry. Dordrecht: Springer, v. 105, n. 2, p. 467-471, 2011.