Complexes of zinc(II) with 1,2-disubstituted benzimidazoles

The reactions of hydrated halides and perchlorate of divalent zinc with 1-o-hydroxybenzyl-2-o-hydroxyphenyl-benzimidazole (L1), 1-m-hydroxybenzyl-2-m-hydroxyphenylbenzimidazole (L2),1-p-hydroxybenzyl-2-p-hydroxyphenyl-benzimidazole (L3) and 1-o-chlorobenzyl-2-o-chlorophenylbenzimidazole (L4) ligands in 1:2 and 1:3 molar ratios in absolute ethanol/acetone at refluxing temperature produced white/pale yellow complexes of the formula ZnX2Ln.yH2O [ L = L1, X = Cl, n = 2, y = 1; X = Br, n = 2, y = 0; X = I, n = 3, y = 1; X = ClO4, n = 2, y = 0; L = L2, X = Cl, Br, n = 2, y = 1, X = ClO4, n = 2, y = 2; L = L3, X = Cl, n = 2, y = 0; X = Br, I, n = 3, y = 2; X = ClO4, n = 2, y = 1; L = L4, X = Cl, n = 3, y = 2; X = Br, n = 3, y = 5; X = ClO4, n = 2, y = 0 ]. The complexes are characterised by elemental analysis, conductivity, thermal analysis, IR, 1H and 13C NMR spectral studies.