A highly selective and reversible fluorescence "OFF-ON-OFF" chemosensor for Hg based on rhodamine-6G dyes derivative and its application as a molecular logic gate.

A new rhodamine-6G-based chemosensor X was designed and synthesized for the colorimetric and fluorometric detection of Hg. The chemosensor X responsed to Hg had good sensitivity, high selectivity and excellent reversibility in HEPES buffer (10 mM, pH 7.4)/CHCN (40:60, V/V).