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A novel chemodosimeter for fluoride ions (F(-)) based on deprotonation of the C-H group followed by an autoxidative decyanation process has been developed for the first time, with a "naked-eye" response (OFF-ON-OFF) and ratiometric chromofluorogenic selective sensing for F(-).

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A fluorescent and colorimetric anion sensor based on the activated C-H group has been developed, and its reusability and ability to selectively detect cyanides have been demonstrated. The system utilizes trifluoromethylcarbinol-directed C-H regioselective cyanomethylation for direct C-C bond formation between the fluorophore and acetonitrile. The present paper also describes a novel strategy for the enhancement of carbanion stability by a potential intramolecular C[double bond, length as m-dash]OH-C hydrogen bonding system, thus providing a new way to develop activated CH-based anion receptors.

A colorimetric anion sensor based on the activated C–H group is described, and the selective and reusable detection of cyanide using the sensor is demonstrated. The system uses bromine to block isomerization and trifluoromethyl-directed C–H regioselective functionalization for direct C–C bond formation between a fluorophore and 2-(pyridin-2-yl)­acetonitrile. Thus, this system provides a new way to develop activated CH-based anion receptors.