A Coumarin-Based Luminescent Chemosensor for Recognition of Cu²⁺ and its In-Situ Complex for CN^- Sensing via Cu²⁺...

A new coumarin based chemosensor has been developed for selective fluorescent recognition of Cu²⁺ in MeOH/H₂O (4:1, v/v at pH = 7.2 aqueous solution) medium with 1:1 binding stoichiometry. The in-situ prepared Cu²⁺ complex displays high selectivity towards CN^- via Cu²⁺ displacement approach with detection limit in the micro molar range. Moreover, in presence of Cu²⁺, the receptor exhibits reversible emission change with EDTA and thus offers an interesting property of molecular 'IMPLICATION' logic gate with Cu²⁺ and EDTA as chemical inputs.