A novel C-glycosyl rhodamine-based fluorescent sensor with a thiourea receptor
has been readily synthesized and its fluorogenic behavior towards various metal ions
was fully studied. It was found that the obtained target sensor exhibited good selectivity
for Hg2+ over many other metal ions, which has been attributed to a binding mode of
thiourea with thiophilic Hg2+, the sensor showed high selectivity and sensitivity to Hg2+
with a violent fluorescence enhancement at 580 nm. The sensing mechanism was explored
by spectroscopic techniques and the IR analysis results demonstrated that a 1:1 mixture
was formed between Hg2+ and the sensor.
Keywords: C-glycosyl, rhodamine-based, fluorescent sensor, thiourea receptor, thiophilic Hg2+, spectroscopic techniques.
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