Synthesis, characterization and antimicrobial activities of Ni(II), Cu(II), Zn(II) and Cd(II) ternary complexes involving 8-quinolinol as primary ligand and bidentate glycine or tridentate aspartic acid as secondary ligand

This paper reports the isolation of mixed ligand complexes of the type MAL, where M = Ni(II), Cu(II), Zn(IT), Cd(II) A = 8-quinolinol(HQUIN) and L = a mino acid (glycine-HL' or aspartic acid-H2L"). The complexes of Ni(II) and Cu(II) are coloured and insoluble in common organic solvents. Their structu res have been elucidated on the basis of magnetic, electronic and IR spectr oscopy. Electronic spectra, in conjunction with magnetic moments, are in ac cord with an octahedral environment around the central metal ion in all met al chelates except the Zn(II) and Cd(II) chelates. All chelates are paramag netic except the Zn(II) and Cd(II) compounds which are found to be diamagne tic. A study of the thermal properties and antimicrobial activity of the co mplexes has also been carried out.