A new colorimetric and fluorescent probe based on Rhodamine B hydrazone derivatives for cyanide and Cu in aqueous media and its application in real life.

A simple selective colorimetric and fluorimetric chemosensor RD based on Rhodamine B hydrazone derivatives was designed and synthesized, which showed both colorimetric and fluorescence responses for cyanide and Cu in aqueous solution with specific selectivity and high sensitivity. In the presence of cyanide, the sensor exhibited a visible color change from colorless to pale yellow by naked-eyes and rapidly produced a strong yellow fluorescence in aqueous solution. The detection limit on fluorescence response of RD sensor to CN is down to 3.

A novel colorimetric and "turn-on" fluorimetric chemosensor for selective recognition of CN ions based on asymmetric azine derivatives in aqueous media.

A novel chemosensor 2-((Z)-(((E)-quinolin-2-ylmethylene)hydrazono)methyl)phenol PX has been successfully designed and synthesized, which showed both colorimetric and "turn-on" fluorescence responses for CN in DMSO/HO (3:2, v/v; pH=7.20) solution. The sensor could respond effectively to the stimulation of CN ions via deprotonation and sensing mechanism of intramolecular charge transfer (ICT).