Distinct optoelectronic properties of four-coordinate and five-coordinate Zn(II) complexes with chiral polypyridine ligands
作者:Xiao-Peng Zhang、Xiao-Wei Qi、Da-Shuai Zhang、Lin-Hua Zhu、Xiang-Hui Wang、Zai-Feng Shi、Qiang Lin
DOI:10.1016/j.poly.2017.01.020
日期:2017.4
Two pairs of chiral Zn(II) complexes, Zn((-)-L-1)Cl-2 ((-)-1) and Zn((+)-L-1)Cl-2 ((+)-1), Zn((-)-L-2)Cl-2 ((-)-2) and Zn((+)-L-2)Cl-2 ((+)-2), [(-)-L-1 = ()-4,5-pinene bipyridine, (+)-L-1= (+)-4,5-pinene bipyridine,(-)-L-2 = (-)-`dipineno-'[4,5:4 '',5 '']-fused 2,2':6',2 ''-terpyridine, (+)-L-2 = (+)-'clipineno'-[4,5:4 '',5 '']-fused 2,2 '':6 ',2 ''-terpyridine] were facilely prepared by the complexation of ligand L with chiral polypyridine ligands with ZnCl2. Their structures were characterized by single crystal X-ray diffraction and electronic circular dichroism (CD) spectra. The central Zn(II) nucleus in (-)-1 is surrounded in a four-coordinate tetrahedral geometry, while the coordination polyhedron of the Zn(II) ion in (-)-2 can be described as a significantly distorted square-pyramidal. Due to different coordination modes and crystal space groups, complexes (-)-1 and (-)-2 show distinct ferroelectric behaviors and nonlinear optical properties, while both of them are emissive at room temperature, which may give a guidance for designing molecule -based multifunctional materials with diverse coordination configurations. (C) 2017 Elsevier Ltd. All rights reserved.