A reversible fluorescent chemosensor for Fe^(3+) and H_2PO_4^- with “on-off-on” switching in aqueous media  

作　　者：LIU Jun LIN Qi ZHANG YouMing WEI TaiBao 

机构地区：[1]Key Laboratory of Eco-Environment-Related Polymer Materials,Ministry of Education of China [2]Key Laboratory of Polymer Materials of Gansu Province,College of Chemistry and Chemical Engineering,Northwest Normal University

出　　处：《Science China Chemistry》2014年第9期1257-1263,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21064006,21161018,21262032);the Natural Science Foundation of Gansu Province(1010RJZA018);the Program for Changjiang Scholars;Innovative Research Teams in Universities of the Ministry of Education of China(IRT1177)

摘　　要：To realize highly selective relay recognition of Fe3＋ and H2PO4^- ions, a simple benzimidazole-based fluorescent chemosensor （L） was designed and synthesized. Sensor L displays rapid, highly selective, and sensitive recognition to Fe^3＋ in H2O/DMSO （1：1, v/v） solutions. The in stitu-generated L-Fe^3＋ complex solution exhibits a fast response and high selectivity toward dihydrogen phosphate anion via the Fe^3＋ displacement approach. The detection limits of sensor L to Fe^3＋ and L-Fe^3＋complex to H2PO4 anion were estimated to be 1.0 × 10^-9 mol/L. Notably, the sensor was retrievable to indicate dihydrogen phosphate an- ions with Fe^3＋, and HePO4 , in turn, increased. This successive recognition feature of sensor L makes it a potential utility for Fe^3＋ and H2PO4 anion detection in aqueous media.To realize highly selective relay recognition of Fe3+ and H2PO4- ions, a simple benzimidazole-based fluorescent chemosensor(L) was designed and synthesized. Sensor L displays rapid, highly selective, and sensitive recognition to Fe3+ in H2O/DMSO(1:1, v/v) solutions. The in situ-generated L-Fe3+ complex solution exhibits a fast response and high selectivity toward dihydrogen phosphate anion via the Fe3+ displacement approach. The detection limits of sensor L to Fe3+ and L-Fe3+complex to H2PO4- anion were estimated to be 1.0 × 10-9 mol/L. Notably, the sensor was retrievable to indicate dihydrogen phosphate anions with Fe3+, and H2PO4-, in turn, increased. This successive recognition feature of sensor L makes it a potential utility for Fe3+ and H2PO4- anion detection in aqueous media.

关 键 词：fluorescence sensor ＂on-off-on＂ switching reversible fluorescence low-detection limit aqueous media 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]