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Synthesis, characterization, and thermal behavior of palladium(II) complexes containing 4-iodopyrazole

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Abstract

The mononuclear pyrazolyl complexes [PdCl2(HIPz)2] (1), [PdBr2(HIPz)2] (2), [PdI2(HIPz)2] (3), [Pd(SCN)2(HIPz)2] (4), and [Pd(NHCOIPz)2] (5) have been prepared. Compound 1 was obtained from the displacement of acetonitrile from [PdCl2(CH3CN)2] precursor by the 4-iodopyrazole (HIPz) ligand, whereas 2–5 were synthesized by substitution of the chlorido in 1 by the respective anionic group. The compounds were characterized by elemental analysis, infrared spectroscopy, and 1H NMR spectroscopy. The thermal behavior of 1–5 has been studied by TG and DTA. The thermal stability of [PdX2(HIPz)2] compounds varies according to the trends X = Cl− < I− ≅ SCN−< Br−. No stable intermediates were isolated during the thermal decompositions due to the overlap of the degradation processes. The final products of the thermal decompositions were characterized as metallic palladium by X-ray powder diffraction.

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Acknowledgements

This research was supported by CNPq, FAPESP, Capes, FAPEMIG and FINEP.

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Authors and Affiliations

  1. Departamento de Química Geral e Inorgânica, Instituto de Química, UNESP-Univ Estadual Paulista, Araraquara, SP, CEP 14801-970, Brazil

    Cristiana da Silva, Dênis A. M. da Silva, Fillipe V. Rocha, Carolina V. Barra, Regina C. G. Frem, Adelino V. G. Netto & Antonio E. Mauro

  2. Universidade Federal de Alfenas, Alfenas, MG, CEP 31130-000, Brazil

    Eduardo T. de Almeida

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  1. Cristiana da Silva
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  2. Dênis A. M. da Silva
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  3. Fillipe V. Rocha
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  4. Carolina V. Barra
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  5. Regina C. G. Frem
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  6. Adelino V. G. Netto
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  7. Antonio E. Mauro
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Correspondence to Cristiana da Silva or Regina C. G. Frem.

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da Silva, C., da Silva, D.A.M., Rocha, F.V. et al. Synthesis, characterization, and thermal behavior of palladium(II) complexes containing 4-iodopyrazole. J Therm Anal Calorim 117, 1327–1334 (2014). https://doi.org/10.1007/s10973-014-3925-x

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