Thermal Study in Solid State of Zn(II)-Diclofenac Complex: Behavior Kinetic of the Dehydration, Transition Phase and Thermal Decomposition
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Data
2010-06-01
Autores
Kobelnik, Marcelo [UNESP]
Quarcioni, Valdecir Angelo
Ribeiro, Clovis Augusto [UNESP]
Vieira Capela, Jorge Manuel [UNESP]
Dias, Diogenes dos Santos [UNESP]
Crespi, Marisa Spirandeli [UNESP]
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Editor
Chinese Chemical Soc
Resumo
The dehydration, thermal decomposition and transition phase stage of Zn(II)-diclofenac compound were studied by simultaneous TG-DTA and DSC techniques. The TG and DSC curves of this compound were obtained with the mass of sample of 2 and 5 mg. Additionally, DSC curves were carried out in opened and closed alpha-alumina pans under static and nitrogen atmosphere. The DTA and DSC curves show that this compound possesses exothermic transition phase between 170-180 degrees C, which it is irreversible (monotropic reaction) The kinetics study of this transition phase stage was evaluated by DSC under non-isothermal conditions. The obtained data were evaluated with the isoconversional method, where the values of activation energy (E(a) / kJ mol(-1)) was plotted in function of the conversion degree (alpha). The results show that due to mass sample, different activation energies were obtained From these curves a tendency can be seen where the plots maintain the same profile for closed lids and almost run parallel to each other.
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Zn(II)-diclofenac complex, Thermal behavior, Transition phase, Kinetic
Como citar
Journal of The Chinese Chemical Society. Taipei: Chinese Chemical Soc, v. 57, n. 3A, p. 384-390, 2010.