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Kinetics and molecular modeling of biologically active glutathione complexes with lead(II) ions

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Abstract

Lead(II) complexes of reduced glutathione (GSH) of general composition [Pb(L)(X)]·H2O (where L=GSH; X=Cl, NO3, CH3COO, NCS) have been synthesized and characterized by elemental analyses, infrared spectra and electronic spectra. Thermogravimetric (TG) and differential thermal analytical (DTA) studies have been carried out for these complexes. Infrared spectra indicate deprotonation and coordination of cysteinyl sulphur with metal ion. It indicates the presence of water molecule in the complexes that has been supported by TG/DTA. The thermal behaviour of complexes shows that water molecule is removed in first step-followed removal of anions and then decomposition of the ligand molecule in the subsequent steps. Thermal decomposition of all the complexes proceeds via first order kinetics. The thermodynamic activation parameters, such as E*, A, ΔH*, ΔS* and ΔG* have been calculated. The geometry of the metal complexes has been studied with the help of molecular modeling for energy minimization calculation.

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Authors and Affiliations

  1. Department of Chemistry, University of Delhi, Delhi, India, 110007

    B. K. Singh, R. K. Sharma & B. S. Garg

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  1. B. K. Singh
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  2. R. K. Sharma
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  3. B. S. Garg
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Correspondence to B. S. Garg.

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Singh, B.K., Sharma, R.K. & Garg, B.S. Kinetics and molecular modeling of biologically active glutathione complexes with lead(II) ions. J Therm Anal Calorim 84, 593–600 (2006). https://doi.org/10.1007/s10973-005-7156-z

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  • DOI: https://doi.org/10.1007/s10973-005-7156-z

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