Trihydrated Complex of Tetrabenzimidazole Copper(Ⅱ) Sulfate

Abstract

Abstract: A Trihydrated complex of benzimidazole copper(Ⅱ) sulfate [(C₇H₆N₂)₄CuSO₄]·3H₂O was synthesized and structurally characterized.The crystal structure of this compound is built up of six solvated water molecules and two dissimilar copper ions identified as Cu1 and Cu2.The coordination geometry of copper(Ⅱ) is a slightly distorted square pyramid.The four equivalent tertiary nitrogen atoms of the benzimidazole ligand form an equatorial plane, while the oxygen atoms of sulfato occupy the axial site.In the solid state, the title compound forms a three dimensional network structure via hydrogen bonds.The benzimidazole, sulfato ion and H₂O moieties are connected by the intermolecular hydrogen bonds.The (EPR) spectrum shows axial symmetry with g_⊥=2.039 and g_||=2.285.Variable temperature magnetic susceptibility shows that there is a weak antiferromagnetic interaction between the neighboring copper(Ⅱ) ions.

Key words: Benzimidazole, Copper(Ⅱ) complex, Crystal structure, EPR, Magnetic susceptibility

JIAN Fang-fang, WANG Huan-xiang, XIAO Hai-lian, JIAO Kui. Trihydrated Complex of Tetrabenzimidazole Copper(Ⅱ) Sulfate[J]. Chemical Research in Chinese Universities, 2005, 21(1): 12-16.

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