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Kinetics and mechanism of degradation of Co(II)–N-benzyloxycarbonylglycinato complex

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Abstract

The kinetics of multi-step thermal degradation of Co(II) complex with N-benzyloxycarbonyl glycinato ligand [Co(N-Boc-gly)2(H2O)4]·2H2O, in non-isothermal conditions was studied using isoconversional and non-isoconversional methods. The degradation of complex occurs in three well-separated steps involving the loss of water molecules in first step followed by two degradation steps of dehydrated complex. The dependence of Arrhenius parameters on conversion degree showed that all observed steps of thermal degradation are very complex, involving more than one elementary step, as can be expected for most solid-state heterogeneous reactions with solid reactants and solid and gaseous products. It was shown that step 1, corresponding to the dehydration, involves a series of competitive dehydration steps of differently bound water molecules complicated by diffusion. Second step involves two parallel reactions related to the loss of two identical C6H5CH2O– ligand fragments complicated by the presence of products in gaseous state. Further degradation in step 3 corresponds to complex process with a change in the limiting stage, in this case from the kinetic to the diffusion regime, connected with the presence of gaseous products diffusing through the solid product.

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Acknowledgements

This work was supported by the Ministry of Science and Technological Development of the Republic of Serbia, Grant Nos. 172015, 172055 and 45007.

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Authors and Affiliations

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

    Dragica M. Minić

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

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

  3. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia

    Dejan Poleti

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  1. Dragica M. Minić
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Correspondence to Dragica M. Minić.

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Minić, D.M., Šumar-Ristović, M.T., Miodragović, Đ.U. et al. Kinetics and mechanism of degradation of Co(II)–N-benzyloxycarbonylglycinato complex. J Therm Anal Calorim 107, 1167–1176 (2012). https://doi.org/10.1007/s10973-011-1368-1

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