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Thermal properties of solid complexes with biologically important heterocyclic ligands

Part IV. Thermal and spectral properties of 2-chloro- and 2-bromobenzoato Cu(II) complexes with nicotinamide and different bonded water molecules

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Abstract

Thermogravimetry (TG), derivative thermogravimetry (DTG) and infrared (IR) spectroscopy have been applied to the investigation of the thermal behaviour and structure of the compounds [Cu(2-Clbz)2(nia)2(H2O)2] (I), [Cu(2-Clbz)2(nia)2]·H2O (II), [Cu(2-Brbz)2(nia)2]·2H2O (III), [Cu(2-Brbz)2(nia)2(H2O)] (IV), where 2-Clbz and 2-Brbz = 2-chloro- and 2-bromobenzoate anions, nia = nicotinamide, H2O = water molecules. Thermal decomposition of all studied compounds proceeds in three steps. Heating the compounds first results in a release of non-coordinated and/or coordinated water molecules. The final product of thermal decomposition was CuO. The thermal stability of the complexes can be ordered in the sequence: I<IV<III<II. Nicotinamide is coordinated to Cu(II) through the nitrogen atom of the heterocyclic ring. IR data suggest the unidentate coordination of benzoate anions to Cu(II) in complexes I, IV and bidentate coordination in complexes II and III.

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Acknowledgements

We wish to thank the Slovak Grant Agency (project KEGA: 002 TnUAD 4/2011) for the financial support.

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Authors and Affiliations

  1. Department of Chemical Technologies and Environment, Faculty of Industrial Technologies, Trenčín University of A. Dubček, 020 32, Puchov, Slovakia

    E. Jóna, L’. Lajdová, M. Loduhová, S. Lendvayová & S. C. Mojumdar

  2. Department of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta, Bratislava, Slovakia

    V. Pavlík

  3. Institute of Inorganic Chemistry, Technologies and Materials, Slovak Technical University, Radlinského 9, 812 37, Bratislava, Slovakia

    J. Moncol’

  4. Department of Industrial Design, Faculty of Industrial Technologies, Trenčín University of A. Dubček, 020 32, Ruzomberok, Slovakia

    P. Lizák

  5. Department of Chemistry, University of Guelph, Guelph, ON, Canada

    S. C. Mojumdar

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  1. E. Jóna
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  2. L’. Lajdová
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Correspondence to S. C. Mojumdar.

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Jóna, E., Lajdová, L., Loduhová, M. et al. Thermal properties of solid complexes with biologically important heterocyclic ligands. J Therm Anal Calorim 108, 921–926 (2012). https://doi.org/10.1007/s10973-012-2365-8

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