Synthesis and Characterization of Novel Ruthenium(II) Chelates with Some Schiff Bases Derived from 4-Benzoyl-3-Methyl-1-Phenyl-2-Pyrazolin-5-One and Sulpha Drugs

Abstract

Abstract Three novel ruthenium(II) complexes with the neutral bidentate O,N-donor Schiff bases L-L (where L-L is the Schiff base prepared from sulphadiazine, sulphamerazine or sulphamethazine and 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one) have been synthesized by the interaction of K2RuCl5. H2O and the Schiff bases in aqueous ethanol. The complexes, which have been characterized on the basis of elemental analyses, molar conductances, cyclic voltammetry, infrared, electronic and proton nuclear magnetic resonance spectral studies, have the general formula [Ru(L-L)2(Cl)2]. Ethanol reduces ruthenium(III) to ruthenium(II) during reflux. An octahedral structure is proposed for these diamagnetic complexes.