Steric Control over Supramolecular Polymer Formation in trans-1,2-Bis(4-pyridyl)ethylene Adducts of Zinc Xanthates: Implications for Luminescence

作者：Kang Jun Gill^*; Shin Jung Sik; Cho Dong Hee; Jeong Yong Kwang; Park Changmoon; Soh Shu Fang; Lai Chian Sing; Tiekink Edward R T

来源：Crystal Growth & Design, 2010, 10(3): 1247-1256.

DOI：10.1021/cg9012735

Steric control over supramolecular aggregation is demonstrated for a series of adducts formed between Zn(S(2)COR)(2) and trans-1,2-bis(4-pyridyl)ethylene, whereby supramolecular zigzag polymers are found when R is small, that is, Et (1) and n-Bu (2). but only bimetallic aggregates Could be formed when R = Cy (3). This results in different coordination geometries: four-coordinate N(2)S(2) zinc in 1 and 2, and five-coordinate NS(4) zinc in 3, a feature which greatly influences photophysical responses ill the solid State. When excited in the UV region, {Zn(St(2)COEt)(2)L}(infinity) (1) and {[Zn(S(2)COCy)(2)](2)L} (3) produce broad luminescence in the visible region. Five-coordinate 3 produces more broad and intense luminescence than four-coordinate 1. The configuration interaction singles (CIS) and post-Hartree-Fock (HF) calculations for 1 and 3 indicate the A-band excited state is responsible for the observed luminescence which is strongly associated with charge transfer from S and Zn.

• 出版日期2010-3
• 单位南阳理工学院