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Kinetic of solid-state degradation of transitional coordinative compounds containing functionalized 1,2,4-triazolic ligand

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Abstract

Three coordinative compounds containing Ni(II), Cd(II) and Zn(II) and functionalized 1,2,4-triazolic ligand were prepared and characterized by both thermal and non-thermal methods. The applied instrumental techniques consisted in TG/DTG/HF analysis, FTIR spectroscopy, elemental analysis and complexometric titration, while the decomposition mechanism was evaluated by evolved gas analysis. The kinetic analysis of the thermolysis of the metal complexes was achieved using the thermogravimetric data in air for the main step of decomposition under thermal treatment in non-isothermal conditions. The kinetic parameters were estimated by using three isoconversional methods (Kissinger–Akahira–Sunose, Flynn–Wall–Ozawa and Friedman) and data collected at five different heating rates, β = 5, 7, 10, 12 and 15 °C min−1. The obtained results were corroborated with the ones obtained by using a different approach of kinetic study, namely the nonparametric kinetics method, which allows a separation of the temperature, respective conversion dependence of the reaction rate. The obtained values for the kinetic parameters are in a good agreement for all the applied protocols.

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Acknowledgements

This work was supported by a Grant from the University of Medicine and Pharmacy “Victor Babeş” Timişoara (Grant II-C2-TC-2014-16498-08 to Ionuţ Ledeţi).

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Authors and Affiliations

  1. Faculty of Pharmacy, University of Medicine and Pharmacy “Victor Babeş”, Eftimie Murgu Square 2, 300041, Timişoara, Romania

    Ionuţ Ledeţi & Adriana Fuliaş

  2. Research Centre for Thermal Analysis in Environmental Problems, West University of Timisoara, Pestalozzi Street 16, 300115, Timişoara, Romania

    Gabriela Vlase & Titus Vlase

  3. Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timişoara, 6 Carol Telbisz, 300001, Timişoara, Romania

    Vasile Bercean

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  1. Ionuţ Ledeţi
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  2. Gabriela Vlase
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  5. Adriana Fuliaş
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Correspondence to Gabriela Vlase.

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Ledeţi, I., Vlase, G., Vlase, T. et al. Kinetic of solid-state degradation of transitional coordinative compounds containing functionalized 1,2,4-triazolic ligand. J Therm Anal Calorim 121, 1049–1057 (2015). https://doi.org/10.1007/s10973-015-4520-5

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