• B S Prabhananda

      Articles written in Journal of Chemical Sciences

    • Stabelity of mixed ligand complexes of copper(II): ESR studies

      B S Prabhananda

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      Three new mixed ligand complexes of Cu(II) obtained by combining any two of the three ligands, diethyldithiocarbamate, N-benzoyl-N′-diethylthiocarbamide and acetylacetonate have been identified in reaction mixtures using electron spin resonance (esr), by estimating the equilibrium constantK associated with the ligand exchange reaction. TheK values were also determined for fifteen other mixed ligand complexes of Cu(II) reported earlier. The stability of these mixed ligand complexes was correlated with the difference in the strengths of covalent bonding between the metal ion and the two ligands. The bondings involving both the$$d_{x^2 } - _{y^2 } $$ anddxy orbitals on the metal were necessary. In addition, the extent of metal 4s-orbital mixed in the unpaired electron orbital contributed to the magnitude ofK. The diagrams similar to the ones used in our correlation could be useful in predicting the probable yield of mixed ligand complexes in reaction mixtures.

    • Stabilities of mixed ligand complexes of Cu(II) with ligands coordinating through O and N : ESR studies

      Madhuri M Ugrankar B S Prabhananda

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      Mixed ligand complexes of Cu(II) with 8-hydroxy-quinolinate (Hy) as one ligand and acetylacetonate (ac.ac) or salicylaldehydate (Sal) as the second ligand have been prepared in reaction mixtures of Cu(Hy)2 + Cu(ac.ac)2 and Cu(Hy)2 + Cu(Sal)2 in chloroform. Ligand hyperfine structures and the minimum ESR linewidth associated withm = − 3/2 hyperfine component have been used to detect and identify the mixed ligand complexes. The ligands in these complexes coordinate through O or N. The constantsK associated with the ligand exchange equilibriums are ~ 2 at −20°C and are close to the value expected from the empirical relation obtained in an earlier work from a study of Cu(II) complexes in which S also participates in the coordination.

    • Coordinating iigand atoms in Cu2+-calcimycin complex: Conclusions from EPR linewidths in chloroform solutions

      B S Prabhananda Mamta H Kombrabail

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