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Physico-chemical investigations and thermal degradation studies of 4-ethylpiperazine-1-carbodithioic acid complexes of copper(II)

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Abstract

Synthesis of copper(II) carbodithioates, viz.[Cu(4-EtPipzcdtH)2]X n (4-EtPipzcdtH = 4-ethylpiperazine-1-carbodithioic acid, X = Cl, ClO4, NO3 and CH3COO when n = 2; X = SO4 when n = 1), has been carried out. These have been investigated by FT-IR, UV–Visible spectral and room temperature magnetic (1.59–1.72 B.M.) studies. 1H NMR and ESMS of [Cu(4-EtPipzcdtH)2](ClO4)2 and [Cu(4-EtPipzcdtH)2]Cl2 further supported their formation. Based on characterization techniques chelating bidentate mode of coordination of ligand, 4-EtPipzcdtH with four coordination around copper(II) was proposed. Copper(II) carbodithioates with Cl, ClO4, NO3 and CH3COO as counter anions exhibited 1:2 electrolytic behaviour, while 1:1 electrolytic behaviour was observed for complex with SO4 as counter anion. Cyclic voltammetry study conducted on complexes, viz. [Cu(4-EtPipzcdtH)2]X n (X = Cl, ClO4, NO3 when n = 2; X = SO4 when n = 1) revealed redox process due to CuII/CuIII couple. Complexes were also studied using non-isothermal techniques (TG/DSC). The complexes [Cu(4-EtPipzcdtH)2]X 2 (X = ClO4, NO3) showed oxidative thermal decomposition behaviour.

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Authors and Affiliations

  1. Department of Chemistry, Himachal Pradesh University, Shimla, 171005, India

    Shashi B. Kalia, Manjeet Sharma, Monika Bharti & Dharvinder Kumar

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  1. Shashi B. Kalia
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  2. Manjeet Sharma
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Correspondence to Shashi B. Kalia.

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Kalia, S.B., Sharma, M., Bharti, M. et al. Physico-chemical investigations and thermal degradation studies of 4-ethylpiperazine-1-carbodithioic acid complexes of copper(II). J Therm Anal Calorim 130, 1095–1103 (2017). https://doi.org/10.1007/s10973-017-6426-x

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  • DOI: https://doi.org/10.1007/s10973-017-6426-x

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