New regioisomeric naphthol-substituted thiazole based ratiometric fluorescence sensor for Zn2+ with a remarkable red shift in emission spectra
作者:Aasif Helal、Mohammad Harun Or Rashid、Cheol-Ho Choi、Hong-Seok Kim
DOI:10.1016/j.tet.2011.10.106
日期:2012.1
Ratiometric fluorescent chemosensors based on the position of ring annulation of the naphthol-thiazole moiety for quantification of zinc ions in aqueous ethanol were synthesized and investigated. It was found that sensor 3 exhibited a remarkably large red shift of 140 nm in emission upon complexation with Zn2+. A TD-B3LYP/6-31G (d,p) calculation was performed to characterize the nature of the fluorescence behavior of sensor 3 upon Zn2+ complexation. The combination of experimental and computational analyses provides a more complete understanding of the molecular level origin of these unique photophysical properties of this type of chemosensor. (C) 2011 Elsevier Ltd. All rights reserved.