Article ID Journal Published Year Pages File Type
10412717 Sensors and Actuators B: Chemical 2015 10 Pages PDF
Abstract
Two novel conjugated polymers containing 2,3-di(pyridin-2-yl)quinoxaline (DPQ) unit (P1) and 2,3-di(thiophen-2-yl)quinoxaline (DTQ) unit (P2) were designed and synthesized through Sonogashira coupling reaction. P1 provided high sensitivity and selectivity to silver ions: color change from green to brown red and fluorescent emission quenching, which can be observed by naked eye, even in the presence of interference cations. However, P2 with the similar polymer backbone to P1 showed no absorption and fluorescence changes toward any cations. Therefore, the DPQ units in P1 exhibited a key role for the selective recognition of Ag+, which was further confirmed by the 1H NMR titration, density functional theory (DFT) calculations and electrochemical studies. These results not only imply that DPQ based conjugated polymer is a promising probe of Ag+ ions but also afford a good guidance to design effective polymer sensors in future.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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