Synthesis, Crystal Structure, and Characterization of Two Novel Five-coordinate Zinc(II) Complexes with the Tripod Ligand Tris(N-methylbenzimidazol-2-yl-methyl)amine and α,β-unsaturated Carboxylates

Two novel Five-coordinate zinc(H) complexes with the tripod ligand tris(N-methylbenzimidazol-2-ylmethyl)amine (Mentb) and two different alpha,beta-unsaturated carboxylates, with the composition [Zn(Mentb)(acrylate)] (ClO(4))center dot DMF center dot 1.5CH(3)OH (1) and [Zn(Mentb)(cinnamate)](ClO(4))center dot 2DMF center dot 0.5CH(3)OH (2), were synthesized and characterized by means of elemental analyses, electrical conductivity measurements, IR, UV. and (1)H NMR spectra. The crystal structure of two complexes have been determined by a single-crystal X-ray diffraction method. and show that the Zn(II) atom is bonded to a Mentb ligand and a alpha,beta-unsaturated carboxylate Molecule through four N atoms and one 0 atom, resulting in a distorted trigonal-bipyramidal coordination [tau(1) = 0.853. tau(2) = 0.8551, with approximate C(3) symmetry.