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Study of the thermal behavior of the transition phase of Co(II)–diclofenac compound by non-isothermal method

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Abstract

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 °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.

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Acknowledgements

The authors thank Brazilian agencies CAPES and CNPq for financial support.

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Authors and Affiliations

  1. Centro Universitário do Norte Paulista—UNORP, São José do Rio Preto, SP, Brazil

    Marcelo Kobelnik

  2. Instituto de Química de Araraquara, Unesp—Universidade Estadual Paulista, C.P. 355, Araraquara, SP, 14800-900, Brazil

    Clóvis A. Ribeiro, Diógenes dos Santos Dias, Sonia de Almeida, Marisa Spirandeli Crespi & Jorge M. V. Capela

Authors
  1. Marcelo Kobelnik
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  2. Clóvis A. Ribeiro
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  3. Diógenes dos Santos Dias
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  4. Sonia de Almeida
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  5. Marisa Spirandeli Crespi
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  6. Jorge M. V. Capela
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Correspondence to Sonia de Almeida.

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Kobelnik, M., Ribeiro, C.A., dos Santos Dias, D. et al. Study of the thermal behavior of the transition phase of Co(II)–diclofenac compound by non-isothermal method. J Therm Anal Calorim 105, 467–471 (2011). https://doi.org/10.1007/s10973-010-1208-8

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