Steric control over supramolecular polymer formation in trans-1,2-Bis(4-pyridyl)ethylene adducts of zinc xanthates: implications for luminescence

Kang, J.G. and Shin, J.S. and Cho, D.H. and Jeong, Y.K. and Park, C. and Soh, S.F. and Lai, C.S. and Tiekink, E.R.T. (2010) Steric control over supramolecular polymer formation in trans-1,2-Bis(4-pyridyl)ethylene adducts of zinc xanthates: implications for luminescence. Crystal Growth & Design, 10 (3). pp. 1247-1256.

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Abstract

Steric control over supramolecular aggregation is demonstrated for a series of adducts formed between Zn(S2COR)(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 N2S2 zinc in 1 and 2, and five-coordinate NS4 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(S2COCy)(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.

Item Type: Article
Subjects: Q Science > QD Chemistry
Depositing User: MR Faizal II H
Date Deposited: 21 Dec 2015 08:00
Last Modified: 21 Dec 2015 08:00
URI: http://eprints.um.edu.my/id/eprint/15122

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