Reactions of Fe(III), Co(II) and Cu(II) Ions with 2-Salicylidene-4-aminophenyl Benzimidazole

M. Chandrakala1,2

1Department of Chemistry, Bangalore Institute of Technology, K.R. Road, Bengaluru-560004, India

2Department of Chemistry, V.V. Pura College of Science, K.R. Road, Bengaluru-560004, India

Corresponding author: E-mail: mchandrakala.kum@gmail.com

Abstract

Reactions of Fe(III), Co(II) and Cu(II) ions with 2-salicylidene-4-aminophenyl benzimidazole (LH; SAPbzlH) in ethanol/acetone produced complexes of the formulae [FeCl(L)2]2·2H2O; [FeBr2(LH)2]Br; [MCl(L)]2·0.5H2O (M = Co, Cu), [M(L)H2O]2Br2·nH2O (M = Co, n = 0 ; M = Cu, n = 2); [Co(LH)2]n. The metal complexes were characterized by elemental analysis, molar conductance, IR, Far-IR, MS, AAS and TGA. The chloro complex of iron(III) is dimeric with dichloro bridge whereas the bromo complex is monomeric, the metal ion having an octahedral environment. The chloro complexes of Co(II) and Cu(II) are dimeric with bridging Schiff base and terminal halides, the metal ion being in a square planar environment. The bromo complexes of Co(II) and Cu(II) are dimeric with bridging Schiff base and terminal water molecule, the metal ion being in a square planar environment. Molar conductance measurements of the bromo complexes in DMSO has revealed 1:2 electrolytic behaviour. Cobalt acetate and perchlorate with SAPbzlH yielded polymeric complexes with ligand bridging. The magnetic susceptibility data have suggested tetrahedral environment around the metal ion.

Keywords

2-Salicylidene-4-aminophenyl benzimidazole, Fe(III), Co(II), Cu(II) complexes.

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