Artículos de revistas
Thermal study in solid state of Zn(II)-diclofenac complex: Behavior kinetic of dehydration, transition phase and thermal decomposition
Fecha
2010Registro en:
Journal of the Chinese Chemical Society, v. 57, n. 3A, p. 384-390, 2010.
0009-4536
10.1002/jccs.201000057
8498310891810082
8087755201222731
4457973246553642
7471310113999140
0000-0002-7984-5908
Autor
Universidade Estadual Paulista (Unesp)
Instituto de Pesquisas Tecnológicas (IPT)
Institución
Resumen
The dehydration, thermal decomposition and transition phase stage of Zn(II)-diclofenac compoundwere studied by simultaneous TG-DTA and DSC techniques. The TG and DSC curves of this compoundwere obtained with the mass of sample of 2 and 5 mg. Additionally, DSC curves were carried out inopened and closed a-alumina pans under static and nitrogen atmosphere. The DTA and DSC curves showthat this compound possesses exothermic transition phase between 170-180 ºC, which it is irreversible(monotropic reaction). The kinetics study of this transition phase stage was evaluated by DSC undernon-isothermal conditions. The obtained data were evaluated with the isoconversional method, where thevalues of activation energy (Ea/kJmol-1) was plotted in function of the conversion degree (a). The resultsshow that due to mass sample, different activation energies were obtained. From these curves a tendencycan be seen where the plots maintain the same profile for closed lids and almost run parallel to each other.