Li Xutian, Yin Yue, Deng Junjie, Zhong Huixian, Tang Jian, Chen Zhi, Yang Liting, Ma Li-Jun
School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China; Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, PR China; Key Laboratory of Theoretical Chemistry of Environment Ministry of Education, PR China.
Talanta. 2016 Jul 1;154:329-34. doi: 10.1016/j.talanta.2016.03.090. Epub 2016 Mar 29.
A new rhodamine B-benzofurazan based fluorescent probe (1) for Fe(3+) and Hg(2+) was synthesized. In aqueous solution containing 30% (v/v) ethanol, probe 1 shows a high selective fluorescent enhancement recognition to Fe(3+) with a binding ratio of 1:1 (probe 1: Fe(3+)), when the concentration of Fe(3+) is less than that of the probe. When the concentration of Fe(3+) is higher than that of the probe, it shows fluorescent "turn-on" response to Fe(3+) by opening the rhodamine spirolactam with a binding ratio of 1:2 (probe 1: Fe(3+)). Furthermore, probe 1 displays a high selectivity and a hypersensitivity (detection limit is 4.4nM) to Hg(2+) with a binding ratio of 1:1 in ethanol. NMR and UV-vis experiments indicate that the different fluorescent recognition signals to Fe(3+) and Hg(2+) are derived from different binding modes of 1-Fe(3+) and 1-Hg(2+).
合成了一种基于罗丹明B - 苯并呋喃嗪的新型Fe(3+)和Hg(2+)荧光探针(1)。在含有30%（v/v）乙醇的水溶液中，当Fe(3+)浓度低于探针浓度时，探针1对Fe(3+)表现出高选择性荧光增强识别，结合比为1:1（探针1:Fe(3+)）。当Fe(3+)浓度高于探针浓度时，它通过打开罗丹明螺内酰胺对Fe(3+)呈现荧光“开启”响应，结合比为1:2（探针1:Fe(3+)）。此外，探针1在乙醇中对Hg(2+)表现出高选择性和超灵敏性（检测限为4.4 nM），结合比为1:1。核磁共振和紫外可见光谱实验表明，对Fe(3+)和Hg(2+)的不同荧光识别信号源于1 - Fe(3+)和1 - Hg(2+)的不同结合模式。
