Abstract
AbstractTwo novel coumarin‐based Schiff‐base chemosensors are presented. Courtesy to an extended conjugation between the coumarin ring and the attached π‐containing groups, both chemosensors display noteworthy photo‐physical properties including emission maxima at >550 nm. Both chemosensors function as the selective sensors for the ‘turn‐off’ detection of copper ion with the significant nanomolar detection limits. The sensing event was investigated through proton NMR and mass spectroscopy; pH studies; life‐time and quantum yield measurements and DFT studies. The solution‐generated [chemosensor‐Cu] species illustrated remarkably selective secondary ‘turn‐on’ detection of the citrate ion. The sequential detection of the copper and citrate ions have been utilized for the construction of logic gates as well as several low‐cost detection methods.
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