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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We wish to thank the Slovak Grant Agency (project KEGA: 002 TnUAD 4/2011) for the financial support.
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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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DOI: https://doi.org/10.1007/s10973-012-2365-8