Turn-On Fluorescent Chemosensor for Hg 2#x0002B; Based on Multivalent Rhodamine Ligands

摘要

Rhodamine-based fluorescent chemosensors 1 and 2 exhibit selective fluorescence enhancement to Fe 3#x0002B; and Hg 2#x0002B; over other metal ions at 580 nm in CH 3 CN/H 2 O (3/1, v/v) solution. Bis(rhodamine) chemosensor 1, under optimized conditions (CH 3 CN/HEPES buffer (0.02 M, pH #x0003D; 7.0) (95/5, v/v)), shows a high selectivity and sensitivity to Hg 2#x0002B; , with a linear working range of 0#x02013;50 #x003BC;M, a wide pH span of 4#x02013;10, and a detection limit of 0.4 #x003BC;M Hg 2#x0002B; .