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Thermal stability and degradation of Co(II), Cd(II), and Zn(II) complexes with N-benzyloxycarbonylglycinato ligand

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Abstract

Thermal behavior of Co(II), Cd(II), and Zn(II) complexes with N-benzyloxycarbonylglycinato ligand was investigated using the results of TG, DSC and DTG analysis obtained at different heating rates (2.5 to 30 °C min−1), from room temperature to about 900 °C. Mechanisms of complex degradation, as well as enthalpies of the degradation processes were determined. It is shown that thermal stability of investigated complexes correlates with their crystal structures, especially with the presence of crystallization and coordinated water molecules. The values of dehydration enthalpies are discussed and correlated with composition of the complexes. Kissinger’s, Ozawa’s, and Friedman’s isoconversion methods were used for the determination of kinetic parameters: the pre-exponential factor A and the apparent activation energy E a. For all three complexes and all steps of degradation, the values of kinetics parameters obtained by Kissinger’s and Ozawa’s methods are in good agreement. The results obtained by Friedman’s method showed that some decomposition steps are simple and some others are complex ones.

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Acknowledgements

This work was supported by the Ministry of Science and Technological Development of the Republic of Serbia, Grant Nos. 142062 and 142030.

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Authors and Affiliations

  1. Faculty of Chemistry, University of Belgrade, Studentski trg 16, 11000, Belgrade, Serbia

    Maja T. Šumar-Ristović, Zoran Miodragović, Đenana Miodragović & Katarina K. Anđelković

  2. Faculty of Physical Chemistry, University of Belgrade, Studentski trg 16, 11000, Belgrade, Serbia

    Dragica M. Minić

  3. Department of General and Inorganic Chemistry, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia

    Dejan Poleti

Authors
  1. Maja T. Šumar-Ristović
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  2. Dragica M. Minić
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  3. Dejan Poleti
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  4. Zoran Miodragović
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  5. Đenana Miodragović
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  6. Katarina K. Anđelković
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Correspondence to Katarina K. Anđelković.

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Šumar-Ristović, M.T., Minić, D.M., Poleti, D. et al. Thermal stability and degradation of Co(II), Cd(II), and Zn(II) complexes with N-benzyloxycarbonylglycinato ligand. J Therm Anal Calorim 102, 83–90 (2010). https://doi.org/10.1007/s10973-010-0748-2

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  • DOI: https://doi.org/10.1007/s10973-010-0748-2

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