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Thermoanalytical and spectroscopic studies on hydrazinium lighter lanthanide complexes of 2-pyrazinecarboxylic acid

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Abstract

The new hydrazinium lanthanide metal complexes of 2-pyrazinecarboxylic acid (HpyzCOO) of the formulae (N2H5)2[Ln(pyzCOO)5] · 2H2O (1), where Ln = La or Ce and (N2H5)3[Ln(pyzCOO)4(H2O)] · 2NO3 (2), where Ln = Pr, Nd, Sm or Dy have been synthesized and characterized by physico-chemical methods. The IR absorption bands of N–N stretching at 960 cm−1 unambiguously prove the existence of N2H5 + ions. The bonding parameters β, b1/2, % δ and η, have been calculated from the electronic spectroscopic (hypersensitive) bands of Pr(III) and Nd(III) complexes. All the complexes undergo endothermic followed by exothermic decomposition to leave the respective metal oxides as the end products. However, the DTA of the complexes 2 demonstrate rather sharp peak than the complexes 1, owing to overwhelming exothermicity, which may be due to the loss of both hydrazine and nitrate moieties in the same step. The X-ray powder diffraction studies reveal the existence of isomorphism among the member complexes.

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Acknowledgements

T. Premkumar thanks the Council of Scientific and Industrial Research, New Delhi, for the award of a Senior Research Fellowship. The authors gratefully acknowledge Dr. Nigam P. Rath, Department of Chemistry and Biochemistry, University of Missouri-St. Louis, USA and Dr. J. W. Steed, Kings College, London for helping with single crystal X-ray data collection for the compounds.

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  1. Thathan Premkumar

    Present address: Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, South Korea

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  1. Department of Chemistry, Bharathiar University, Coimbatore, 641046, India

    Thathan Premkumar & Subbiah Govindarajan

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Correspondence to Thathan Premkumar or Subbiah Govindarajan.

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Premkumar, T., Govindarajan, S. Thermoanalytical and spectroscopic studies on hydrazinium lighter lanthanide complexes of 2-pyrazinecarboxylic acid. J Therm Anal Calorim 100, 725–732 (2010). https://doi.org/10.1007/s10973-009-0117-1

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