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Three five-coordinate zinc complexes containing the tripod ligand, tris(N-methylbenzimidazol-2-ylmethyl)amine (Mentb) and three different α,β-unsaturated carboxylates, with compositions [Zn(Mentb)(L1-3)](ClO4) ·nH2O (L1 = trans-cinnamate; L2 = 2-hydroxycinnamate; L3 = 4-hydroxycinnamate; n = 0.5, 2, 1) were synthesized and characterized by means of elemental analyses, electrical conductivity measuerments, IR, UV, and 1H NMR spectra. The crystal structure of [Zn(Mentb)(L3)](ClO4) · DMF · C2H5OH · 0.5CH3OH has been determined by single-crystal X-ray diffraction, and shows that the ZnII atom is bonded to a tris(N-methylbenzimidazol-2-ylmethyl)amine (Mentb) ligand and a 4-hydroxycinnamate ligand through four N atoms and one O atom, resulting in a distorted trigonal-bipyramidal coordination geometry (τ = 0.86), with approximate C3 symmetry. [ABSTRACT FROM AUTHOR]

A novel five-coordinate copper complex with the tripod ligand tris(N-methylbenzimidazol-2-ylmethyl)amine (Mentb) and 2-methacrylate, with the composition [Cu(Mentb)(2-methacrylate](ClO4)· 2DMF· 0.5H2O, was synthesized and characterized by means of elemental analyses, electrical conductivities, thermal analyses, IR, and UV. The crystal structure of the copper complex has been determined by a single-crystal X-ray diffraction method, and shows that the CuII atom is bonded to a tris(N-methylbenzimidazol-2-ylmethyl)amine (Mentb) ligand and a 2-methacrylate molecule through four N atoms and one O atom, giving a distorted trigonal-bipyramidal coordination geometry (τ = 0.78), with approximate C3 molecular symmetry. Cyclic voltammograms of the copper complex indicate a quasireversible Cu+2/Cu+ couple. Electron spin resonance data confirm the trigonal-bipyramidal structure and indicate g| < g∞ with a very small value of A (23 × 10-4 cm-1). [ABSTRACT FROM AUTHOR]