ABSTRACT

A new Mannich base, N-(1-Morpholinesalicylyl)semicarbazide (MSS), formed by the condensation of morpholine, semicarbazide and salicylaldehyde and its Cu(II), Ni(II), Co(II) and Zn(II) complexes have been synthesised. Their structures have been elucidated on the basis of analytical, magnetic, electrical conductivity and spectral methods. The electrochemical property of the ligand and its complexes in acetonitrile solution was studied by cyclic voltammetry.  The X-band ESR spectra of the Cu(II) complex in DMSO at 300 and 77 K were recorded and their salient features are reported. Based on this data, we propose an octahedral geometry for Cu(II), tetrahedral geometry for Co(II) and Zn(II) and square planar geometry for Ni(II) complexes. Antibacterial activities of the ligand and its complexes were tested against some selected bacteria. The ligand and all the complexes showed antimicrobial activities.

Key words: Morpholine, Salicylaldehyde, Metal complexes, Spectral studies, Antimicrobial activity.