• Thermal, magnetic and X-ray diffraction studies on mixed-ligand dimetavanadato complexes of manganese(II)

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      https://www.ias.ac.in/article/fulltext/jcsc/107/05/0551-0558

    • Keywords

       

      Dimetavanadate complexes; thermal/kinetic parameters; manganese (II) complexes

    • Abstract

       

      Novel mixed-ligand dimetavandato complexes of Mn(II) of composition [Mn(en)(H2O)2(VO3)2] and [Mn(pz)(H2O)2(VO3)2]H2O (where en=1,2- diaminoethane, pz=hexahydropyrazine) have been synthesized. The probable structures of the complexes have been worked out on the basis of elemental analysis, IR spectra, magnetic measurements and thermogravimetric analysis. X-ray powder diffraction study has been carried out to determine the unit lattice parameters. Magnetic moment values indicate high-spin complexes of manganese. Dynamic thermogravimetric data of the relevant steps of thermal degradation have been analysed for the study of solid-state kinetics. Non-isothermal methods by Piloyan-Novikova, Coats-Redfern and Horowitz-Metzger have been employed for evaluating the kinetic parameters viz. energy of activation, frequency factor and entropy of activation. The mechanism of non-isothermal decomposition of complexes is ‘phase boundary contracting cylinder nucleation’.

    • Author Affiliations

       

      A P Mishra1 2

      1. Inorganic Laboratories, Department of Chemistry, Dr H S Gaur University, Sagar - 470 003, India
      2. Department of Chemistry, University of Allahabad, Allahabad - 211 002, India
    • Dates

       
  • Journal of Chemical Sciences | News

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