A Fluorescent Chemosensor for Dihydrogen Phosphate Ion Based on 2‐[2‐Hydroxy‐4‐(diethylamino) phenyl]‐1H‐imidazo[4, 5‐b]phenazine‐Fe3+ Ensemble. Issue 12 (9th December 2014)

• Record Type: Journal Article
• Authors: Wei, Taibao; Wu, Guiyuan; Shi, Bingbing; Lin, Qi; Yao, Hong; Zhang, Youming
• Is Part Of: Chinese journal of chemistry. Volume 32:Issue 12(2014:Dec.)
• Page Start: 1238
• Page End: 1244
• Publication Date: 2014-12-09
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cjoc.201400648
• Languages: English
• ISSNs: 1001-604X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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 <bold>GY‐Fe³⁺</bold>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]‐1<italic>H</italic>‐imidazo[4, 5‐<italic>b</italic>]phenazine and Fe³⁺ metal complex (<bold>GY‐Fe³⁺</bold>) were fabricated, which could act as convenient and efficient H₂PO₄⁻ test kits.</p> </abstract>