Abstract
Abstract2,2′‐Bisbenzimidazole derivative (L) was designed as a fluorescent chemosensor for Fe3+. This structurally simple chemosensor displays significant fluorescence quenching with increasing concentrations of Fe3+. L exhibited high selectivity and antidisturbance for Fe3+ among environmentally relevant metal ions in aqueous media. The method of Job's plot indicated the formation of 1:2 complex between L and Fe3+, 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 Fe3+ is down to 10−7 mol·L−1 range. The binding mode was investigated by fluorescence spectra, ESI‐MS, IR data, 1H NMR, 13C NMR and crystal data.
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