A Novel Complex of Gopper(II) Derived from Symmetric Five-Dentate Ligand: Synthesis, Crystal Structure, and Characterization

摘要

A symmetric five-dentate Schiff-base ligand N,N-bis(pyridine-2-carboxaldehyde)diefhylenetri-amine (L) was prepared. An unusual copper(II) complex [CuCl2(L)] · H2O was obtained, when copper chloride reacted with ligand L. In the course of the coordination reaction, a ring closure reaction happens to ligand L. So, the formation process of the complex can be used for reference to synthesize the ring compound. The complex has been characterized fully by elemental analysis, IR, absorption spectra, emission spectra, and single-crystal X-ray diffraction analysis. Moreover, a reasonable reaction mechanism for forming the complex was presumed. The complex was synthesized by treating an ethanolic solution of the appropriate ligand with an equimolar amount of metallic salt. In the complex, the copper atom is five-coordinated, which can be best described as a distorted square-pyramidal geometry with a N3Cl2 donor set, and two parallel one-dimensional chains are formed by packing of the complex.