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

作者：Li, Xutian; Yin, Yue; Deng, Junjie; Zhong, Huixian; Tang, Jian; Chen, Zhi; Yang, Liting; Ma, Li-Jun^*

来源：Talanta, 2016, 154: 329-334.

DOI：10.1016/j.talanta.2016.03.090

• Fluorescent probe
• Rhodamine B-benzofurazan
• Fe3+ and Hg2+
• Medium-controlled recognition
• Dual channel signal

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 4.4 nM) 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+.

• 出版日期2016-7-1
• 单位华南师范大学