COMPLEXES OF COBALT(II), NICKEL(II), COPPER(II), CADMIUM(II), AND MERCURY(II) WITH TETRADENTATE SCHIFF-BASE LIGANDS

A series of metal complexes with three new tetradentate Schiff bases derived from benzoin and benzil with c-toluidine and benzil with diaminoethane have been prepared and characterised by physical and chemical methods. The modes of bonding of the ligands with the metal ions have been proposed. Electronic spectra and room temperature magnetic moment values suggest octahedral geometry for the CoII and NiII complexes, whereas the HgII and CdII complexes have tetrahedral geometry. The CuII complexes are square planar. Apart from the complexes of the Schiff bases derived from benzoin, all the other complexes have high molar conductance values suggesting them to be electrolytes. The complexes have been screened against some fungal pathogens. © 1990 Chapman and Hall Ltd.