Synthesis and Characterization of Co(II), Ni(II), Cu(II) and Zn(II) Complexes with an ONO- and an NNO-Functionalized Ligand
Date
2015-04-21
Authors
Saadeh, Salman M.
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Abstract
A new ligand was synthesized from condensation of 2-aminophenol and 2-
acetylbenzimidazole. This ligand (HAPAB, 6) was characterized based on elemental
analysis, IR, 1H-NMR and 13C-NMR and MS spectral spectra. The complexes of the
ligands, HAPAB (6) and 2-acetylfruan benzoylhydrazone (HAFBH, 3), with Co(II),
Ni(II), Cu(II) andZn(II), encoded a-d, were prepared by reaction of their methanolic
acetate salts with the ligands in methanol in 1:2 metal to ligand mole ratio. These
complexes, M(II)L2, 7a-d and 8a-d, were similarly characterized based on their
physicochemical data by elemental analysis, IR, 1H-NMR and 13C-NMR, MS, molar
conductance and electronic absorption spectra. The complexes consist of two
ligands that give six coordinate bonding to each metal ion on a meridional plane
through binding with the acetylfuran-O, the azomethine-N and the oxygen donor
atom in the enol form of the hydrazone 3 and the 2-acetylbenzimidazole-N, the
azomethine-N, and the phenoxo-O atoms of the imine 6 respectively. The ligands
function as monobasic ONO- and NNOtrifunctional donor ligands where the
deprotonated enolic form is preferred in the coordination producing distorted
octahedral complexes.