Synthesis and Characterization of Schiff Base Complexes of Transition Metals

Abstract

Many a Manganese(III), Cobalt(III), Copper(II), Nickel(II) and Hg(II) complexes with various Schiff Bases have been prepared . Some complexes of Cobalt(III), Manganese(III) are binuclear and some are mononuclear. Though Mn(II) and Co(II) salts were used as the starting material but Mn(II) and Co(II) were oxidised to Mn(III) and Co(III) in the reaction medium during the complex formation. Mononuclear and binuclear complexes of Ni(II) were prepared along with some hetero binuclear complexes of Ni(II) with Hg(II). Three mononuclear complexes of Copper(II) have also been synthesized. All the complexes have been characterized by microanalytical , spectroscopic, single crystal X-Ray diffraction and other physiochemical studies. Supramolecular interaction was studied and found to be newlineoperative in some complexes where the complex units are held together by weak intermolecular hydrogen bonding and/or weak intermolecular and#960; ... interactions in their solid state. Schiff bases have been synthesized by general method of condensation of organic amines with carbonyl compounds. The amines that have used in this study are N-(3-aminopropyl)-N-methylpropane-1,3-diamine, 1,2-diaminopropane, 1,3-diaminopropane and 1,2-diaminocyclohexane. The carbonyl compounds that have been used are salicylaldehyde,2-hydroxyacetophenone, 2-hydroxypropiophenone, pyrrole-2-carboxaldehyde, thiophene-2-carboxaldehyde, 5-bromosalicylaldehyde and 3,5-dibromosalicylaldehyde. The bactericidal properties of some of the complexes are very promising. They are found to possess mild to strong bactericidal properties. This study also describes antibacterial potential newlineof some of the Schiff bases. newline