A highly selective ratiometric fluorescent chemosensor for Hg2+ based on a new diarylethene with a stilbene-linked terpyridine unit
作者:Shuhong Jing、Chunhong Zheng、Shouzhi Pu、Congbin Fan、Gang Liu
DOI:10.1016/j.dyepig.2014.03.023
日期:2014.8
A novel asymmetrical diarylethene with a stilbene-linked terpyridine chromophore has been synthesized by Heck reaction. It exhibited effectively switchable fluorescence when triggered by UV/Vis and Hg2+/EDTA. Induced by Hg2+, its emission peak was red-shifted by 60 nm and emission intensity was enhanced by 4-fold with a concomitant color change from light blue to bright green due to the formation of a 1:2 metal/ligand complex. As a result, the diarylethene can serve as a fluorescence chemosensor for highly selective recognition of Hg2+ in dichloromethane. Moreover, a complicated logic circuit was constructed with the unimolecular platform by using the fluorescence intensity at 514 nm as outputs and the combinational stimuli of light and chemical species as inputs. (C) 2014 Elsevier Ltd. All rights reserved.