A solvent-dependent fluorescent detection method for Fe3+ and Hg2+ based on a rhodamine B derivative

Publication date: 1 July 2016
Source:Talanta, Volume 154
Author(s): Xutian Li, Yue Yin, Junjie Deng, Huixian Zhong, Jian Tang, Zhi Chen, Liting Yang, Li-Jun Ma
A new rhodamine B–benzofurazan based fluorescent probe (1) for Fe³⁺ and Hg²⁺ was synthesized. In aqueous solution containing 30% (v/v) ethanol, probe 1 shows a high selective fluorescent enhancement recognition to Fe³⁺ with a binding ratio of 1:1 (probe 1: Fe³⁺), when the concentration of Fe³⁺ is less than that of the probe. When the concentration of Fe³⁺ is higher than that of the probe, it shows fluorescent "turn-on" response to Fe³⁺ by opening the rhodamine spirolactam with a binding ratio of 1:2 (probe 1: Fe³⁺). Furthermore, probe 1 displays a high selectivity and a hypersensitivity (detection limit is 4.4nM) to Hg²⁺ with a binding ratio of 1:1 in ethanol. NMR and UV–vis experiments indicate that the different fluorescent recognition signals to Fe³⁺ and Hg²⁺ are derived from different binding modes of 1-Fe³⁺ and 1-Hg²⁺.

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