Intracellular detection of hazardous Cd2+ through a fluorescence imaging technique by using a nontoxic coumarin based sensor

A new coumarin based turn on fluorescent sensor (R1) was reported for the detection of highly hazardous Cd2+ with excellent selectivity and sensitivity without any interference of other metal ions. The single crystal X-ray structure analysis of the sensor showed the actual geometry of the molecule. For the first time, a Cd2+ induced FRET mechanism was observed and explained accordingly. Instant naked eye detection of Cd2+ through a sharp colour change signified the practical applicability of R1. The sensor of high quantum yield was applied in the intracellular detection of poisonous Cd2+ in living HeLa S3 cells.