A Highly Selective Fluorescent Chemosensor for Pb~(2+)

摘要

A new fluorescent sensor based on rhodamine B for Pb~(2+) was synthesized.The new fluorescent sensor showed an extreme selectivity for Pb~(2+) over other metal ions examined in acetonitrile.Upon the addition of Pb~(2+),an overall emission change of 100-fold was observed,and the selectivity was calculated to be 200 times that of Zn~(2+).The signal transduction occurs via of reversible CHEF (chelation-enhanced fluorescence) with this inherent quenching metal ion.