• Studies on some rare earth metal complexes: Ten- and six-coordinated complexes of an unsymmetrical aminoacid derivative

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      https://www.ias.ac.in/article/fulltext/jcsc/109/02/0089-0097

    • Keywords

       

      Lanthanide metal complexes; 2,4-dihydroxybenzaldehyde(N-benzoyl)glycyl hydrazone; hypersensitive transitions

    • Abstract

       

      2,4-Dihydroxybenzaldehyde(N-benzoyl)glycyl hydrazone, H3 dhbbgh, has been synthesized and characterized. Rare earth metal complexes of the empirical formulae, [Ln(H3dhbbgh)2Cl2]Cl.nH2O and [Ln(dhbbgh)(H2O)2], where Ln=La(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Tb(III), Dy(III) and Y(III) have been synthesized and characterized by elemental analyses, molar conductances, magnetic susceptibilities, electronic, infrared and NMR spectral studies. Various bonding parameters (β, b1/2, %δ andη) calculated from the electronic spectra of Pr(III), Nd(III), Sm(III) and Dy(III) complexes suggest a weak covalent bond between the metal and ligand. The theoretical oscillator strengths (Pcalcd) and a set of three intensity parameters (Tλ=2,4.6) computed from the Judd-Ofelt equation are found to be in good agreement with experimental values. On the basis of the spectral profiles of the hypersensitive transitions (4I9/24G5/2,2G7/2) in the Nd(III) complexes, coordination numbers ten and six have been proposed for the Ln(III) ions in the adduct and deprotonated complexes respectively.

    • Author Affiliations

       

      P A Kumar1 T R Rao2

      1. Centre for Liquid Crystal Research and Education, Faculty of Physical Sciences, Nagarjuna University, Nagarjuna Nagar - 522 510, India
      2. Department of Chemistry, Banaras Hindu University, Varanasi - 221 005, India
    • Dates

       
  • Journal of Chemical Sciences | News

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