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Transition Metal Complexes with Pyrazole-based Ligands. Part 8. Characterization and thermal decomposition of zinc(II) complexes with di- and trisubstituted pyrazoles

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Abstract

We report the synthesis and the characterization (elemental analysis, FT-IR spectroscopy, thermal methods and molar conductivity measurements) of the mixed complexes of zinc with acetate and 3-amino-5-methylpyrazole, HL 1, [Zn(OAc)2(HL1)2], or 3-amino-5-phenylpyrazole, HL 2 [Zn(OAc)2(HL2)2], or 4-acetyl-3-amino-5-methylpyrazole, HL 3, [Zn(OAc)(L3)(HL3)]2, with isothiocyanate and HL 2 [Zn(SCN)2(HL2)2], or HL 3 [Zn(SCN)2(HL3)2], and with nitrate, isothiocyanate and 3,5-dimethyl-1-carboxamidinepyrazole, HL 4 [Zn(NO3)(NCS)(HL4)2].

The thermal decomposition of the complexes is generally continuous resulting zinc oxide as end product,except [Zn(OAc)(L3)(HL3)]2 in which case a well-defined intermediate was observed between 570–620 K. On the basis of the IR spectra and elemental analysis data of the intermediate a decomposition scheme is proposed.

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Authors and Affiliations

  1. Faculty of Sciences, Institute of Chemistry, University of Novi Sad, 21000, Novi Sad, Trg D. Obradovića 3, Yugoslavia

    K. Mészáros Szécsényi, V. M. Leovac & V. I. Češljević

  2. Faculty of Metallurgy and Technology, Podgorica, Yugoslavia

    Ž. K. Jaćimović

  3. Research Group for Technical Analytical Chemistry of the Hungarian Academy of Sciences at the Institute for General and Analytical Chemistry, Technical University of Budapest, H-1521, Budapest, Hungary

    A. Kovács

  4. Institute for General and Analytical Chemistry, Technical University of Budapest, H-1521, Budapest, Hungary

    G. Pokol & S. Gál

Authors
  1. K. Mészáros Szécsényi
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  2. V. M. Leovac
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  3. Ž. K. Jaćimović
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  4. V. I. Češljević
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  5. A. Kovács
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  6. G. Pokol
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  7. S. Gál
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Mészáros Szécsényi, K., Leovac, V.M., Jaćimović, Ž.K. et al. Transition Metal Complexes with Pyrazole-based Ligands. Part 8. Characterization and thermal decomposition of zinc(II) complexes with di- and trisubstituted pyrazoles. Journal of Thermal Analysis and Calorimetry 63, 723–732 (2001). https://doi.org/10.1023/A:1010135903480

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  • DOI: https://doi.org/10.1023/A:1010135903480

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