A Fluorescent Chemosensor for Dihydrogen Phosphate Ion Based on 2-[2-Hydroxy-4-(diethylamino) phenyl]-1H-imidazo[4,5-b]phenazine-Fe3+ Ensemble

作者：Wei Taibao; Wu Guiyuan; Shi Bingbing; Lin Qi; Yao Hong; Zhang Youming^*

来源：Chinese Journal of Chemistry, 2014, 32(12): 1238-1244.

DOI：10.1002/cjoc.201400648

• long wavelength
• fluorescent
• Fe3+ ion
• H2PO4-
• 1H-imidazo[4,5-b]phenazine

A long wavelength emission fluorescent (612 nm) chemosensor with high selectivity for H2PO4- ions was designed and synthesized according to the excited state intramolecular proton transfer (ESIPT). The sensor can exist in two tautomeric forms ('keto' and 'enol') in the presence of Fe3+ ion, Fe3+ may bind with the 'keto' form of the sensor. Furthermore, the in situ generated GY-Fe3+ ensemble could recover the quenched fluorescence upon the addition of H2PO4- anion resulting in an off-on-type sensing with a detection limit of micromolar range in the same medium, and other anions, including F-, Cl-, Br-, I-, AcO-, HSO4-, ClO4- and CN- had nearly no influence on the probing behavior. The test strips based on 2-[2-hydroxy-4-(diethylamino) phenyl]-1H-imidazo[4,5-b]phenazine and Fe3+ metal complex (GY-Fe3+) were fabricated, which could act as convenient and efficient H2PO4 test kits.

• 出版日期2014-12
• 单位西北师范大学