Synthesis, Crystal Structure, and Properties of Novel Five‐Coordinate Complexes of Zinc(II) and Copper(II) with tris(2‐Benzimidazolylmethyl)amine

Abstract Two complexes of zinc(II) and copper(II) with tris(2‐benzimidazolylmethyl)amine (ntb) and the anion of acrylic acid of the compositions [M(ntb)(acrylate)](acrylate) · 2.5H2O (M = Zn or Cu) were synthesized and characterized by means of elemental analyses, thermal analyses, IR and H1 NMR spectra. The crystal structure of the novel compound [Zn(ntb)(acrylate)](acrylate) · 1.63H2O has been determined by a single‐crystal x‐ray diffraction method and shows that each zinc ion is linked to tris(2‐benzimidazolylmethyl)amine (ntb) and an acrylate; but another acrylate is the anion of the complex. The zinc ion is five‐coordinate with a N4O ligand set. The coordination geometries of the zinc ion maybe best described as a distorted trigonal‐bipyramid of site symmetry C3.