Synthesis and characterization of mixed ligand complexes of Mn11 with 2-hydroxy-1-naphthaldehyde and salicylaldehyde, substituted salicylaldehyde, hydroxy aryl ketones or β-diketones

Department of Chemistry, University of Rajasthan, Jaipur-302 004, Rajasthan, India E-mail : mithagr@gmail.com Manuscript received 02 November 2010, revised 17 June 2011, accepted 20 June 2011 A series of mixed ligand complexes of MnII of the type [MnLL'(H20)2], (where HL = 2-hydroxy-1-naphthaldehyde and HL' = salicylaldehyde, 5-bromosalicylaldehyde, 5-nitrosalicylaldehyde, 2-hydroxyacetophenone, 2- hydroxypropiophenone, 2-hydroxybenzophenone, pentane-2,4-dione, I-phenylbutane-1,3-dione or 1,3-diphenylpropane-1 ,3- dione) have been synthesized by 1 : 1 : 1 molar ratios of manganese(II) acetate with 2-hydroxy-I-naphthaldehyde and above mentioned ligands. The resulting complexes have been characterized by elemental analyses, conductances, IR and FAB mass spectral studies. The in vitro antibacterial studies of the ligands and the metal complexes have also been carried out. The complexes have been found to be more potent bactericides than the ligands. Octahedral geometry has been proposed for the prepared mixed ligand complexes