Author： Kurdziel K. Głowiak T.
Publisher： Taylor & Francis Ltd
ISSN： 0095-8972
Source： Journal of Coordination Chemistry, Vol.60, Iss.8, 2007-01, pp. : 877-889
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Abstract
Two new complexes of imidazole alcohols, 4-hydroxymethylimidazole (4-CH2OHim) and 4-hydroxymethyl-5-methylimidazole (4-CH2OH-5-CH3im), with cobalt(II) of formula [CoL2(H2O)2](NO3)2 were obtained. These compounds were described through single X-ray diffraction studies, spectroscopic (Ir. Far-IR, UV-Vis-NIR) and magnetic measurements. In the present complexes imidazole ligands are bidentate coordinating the heterocyclic ring through pyridine-like nitrogen and the oxygen atom of the hydroxymethyl group (chromophore CoN2O4). The shape of Co(II) coordination polyhedra is that of a distorted octahedron, with the equatorial plane defined by the 4-CH2OHim (or 4-CH2OH-5-CH3im) bidentate ligands and two water molecules occupying axial positions (i.e. trans to each other). Formation of successive cobalt(II) complexes with 4-CH2OH-5-CH3im in aqueous solution was followed quantitatively by potentiometry.
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