Title
Distinct optoelectronic properties of four-coordinate and five-coordinate Zn(II) complexes with chiral polypyridine ligands
Author
Xiao-Peng Zhang, Xiao-Wei Qi, Da-Shuai Zhang, Lin-Hua Zhu, Xiang-Hui Wang, Zai-Feng Shi, Qiang Lin
Year
2017
Journal
Polyhedron
Abstract
Two pairs of chiral Zn(II) complexes, Zn((−)-L1)Cl2 ((−)-1) and Zn((+)-L1)Cl2 ((+)-1), Zn((−)-L2)Cl2 ((−)-2) and Zn((+)-L2)Cl2 ((+)-2), [(−)-L1 = (−)-4,5-pinene bipyridine, (+)-L1= (+)-4,5-pinene bipyridine, (−)-L2 = (−)-‘dipineno’-[4,5:4″,5″]-fused 2,2′:6′,2″-terpyridine, (+)-L2 = (+)-‘dipineno’-[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.
Instrument
J-810
Keywords
Circular dichroism, Stereochemistry, Coordination chemistry