• E Nageswara Rao

      Articles written in Journal of Chemical Sciences

    • Formation constants of ternary complexes of Cu(II), Ni(II), Co(II), Mn(II) and Zn(II) with phenylhydrazones and amino acids

      E Nageswara Rao R Raghava Naidu

      More Details Abstract Fulltext PDF

      The formation constants of mixed ligand complexes of the type M(II) LA, where M(II)=Cu(II), Ni(II), Co(II), Mn(II) or Zn(II) and L=o-hydroxyacetophenonephenylhydrazone (HAPPH), resacetophenonephenylhydrazone (RAPPH) or gallacetophenonephenylhydrazone (GAPPH), A=glycine (Gly),dl-alanine (Ala), ordl-methionine (Met), have been determinedpH-metrically in 70% (v/v) aqueous methanol at 35±0·5°C and μ=0·1 M (KNO3). The evaluated formation constants have been compared and discussed in terms of donor atoms and the size of the chelate rings. The values for the ternary chelates indicate that they are formed under simultaneous equilibria. Causes for the lower stabilities of the ternary systems as compared to those of the binary systems are discussed.

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