Synthesis and characterization of manganese(II), cobalt(II), nickel(II), copper(II), and zinc(II) mixed ligand complexes with [(1-phenyl-3- methyl-5- hydroxopyrazol-4-yl) methylimino] 2′, 3′ dimethylaniline and 2- hydroxy-1-naphthaldehyde

Abstract

Mixed ligand complexes of the type [MLL ' ] where M = Mn (II), Co (II), Ni (II), Cu (II), Zn (II) HL = [(1-phenyl-3methyl-5-hydroxopyrazol-4-yl)phenylimino]2,3-dimethylaniline; (HPMPZP)dma. HL ' = 2-hydroxy-1-naphaldehyde; (HNA), have been synthesized and characterized on the basis of elemental analysis, conductivity measurements, magnetic, electronic and infra red spectral studies. The complexes confirm to 1:1:1 stoichiometry and are non electrolytes. The schiff base HL act as a monovalent bidentate ligand co-ordinating through azomethine nitrogen and phenolic oxygen. On the basis of electronic spectra, IR spectra and magnetic moment measurements; six coordinated octahedral structures have been proposed for the complexes. Thermal studies revealed the presence of two co-ordinated water molecules. The shiff base and mixed ligand complexes have been tested for their antibacterial activity against the Escherichia coli, Bacillus substilis, staphylococcus aureus.