Synthesis, Characterization, and Biocidal Studies of Some Transition Metal Complexes Containing Bidentate Monobasic Hydroxyaldehydes and a Neutral Bidentate Schiff Base

Complexes of the transition metals with salicylaldehyde (sa1H) or 5‐bromosalicylaldehyde (Br‐sa1H) in 1:2 molar ratio, have the compositions [M(H2O)2(sal)2]·H2O (1)or [M(H2O)2(Br–sal)2]·H2O (2), respectively. The Schiff base derived from ethylenediamine and benzaldehyde in 1:1 molar ratio in alcoholic solution yields bis(benzylidene)ethylenediamine (benen). Further reaction of (1)or (2)with benen in alcohol yielded mixed‐ligand complexes of the type[M(sal)2benen] or [M(Br‐sal)2benen], respectively. All of these complexes are soluble in ethanol and methanol. They were characterized on the basis of elemental analyses, magnetic measurements, infrared spectra, electronic spectra and thermogravimetric analyses. All of these complexes have been screened for their antimicrobial activity against bacterial strands using the Agar Diffusion Method.