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Selective Chemosensor of Fe 3+ Based on Fluorescence Quenching by 2,2′‐Bisbenzimidazole Derivative in Aqueous Media
Author(s) -
Wei Taibao,
Liu Jun,
Yao Hong,
Lin Qi,
Xie Yongqiang,
Shi Bingbing,
Zhang Peng,
You Xingmei,
Zhang Youming
Publication year - 2013
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201300019
Subject(s) - chemistry , fluorescence , detection limit , derivative (finance) , aqueous solution , metal ions in aqueous solution , proton nmr , quenching (fluorescence) , photochemistry , selectivity , aqueous medium , ion , analytical chemistry (journal) , organic chemistry , catalysis , chromatography , physics , quantum mechanics , financial economics , economics
2,2′‐Bisbenzimidazole derivative ( L ) was designed as a fluorescent chemosensor for Fe 3+ . This structurally simple chemosensor displays significant fluorescence quenching with increasing concentrations of Fe 3+ . L exhibited high selectivity and antidisturbance for Fe 3+ among environmentally relevant metal ions in aqueous media. The method of Job's plot indicated the formation of 1:2 complex between L and Fe 3+ , and the possible binding mode of the system was also proposed. In addition, further study demonstrates the detection limit on fluorescence response of the sensor to Fe 3+ is down to 10 −7 mol·L −1 range. The binding mode was investigated by fluorescence spectra, ESI‐MS, IR data, 1 H NMR, 13 C NMR and crystal data.