Abstract

A new and simple fluorescent chemosensor 1, based on julolidine and tryptophan moieties, has been synthesized and characterized. The sensor 1 displayed a selective and sensitive detecting ability for aluminum (III) ion by ‘OFF–ON’ fluorescent response in aqueous solution. This sensing mechanism might be due to the inhibition of CN isomerization, and the activation of chelation enhanced fluorescence (CHEF). This sensing mechanism of 1 for Al3+ was supported by theoretical calculations. Moreover, sensor 1 had a low detection limit (6.4 μM), which is below than the WHO recommendation level (7.41 μM) for drinking water. Importantly, the chemosensor 1 could be applied to living cells to detect Al3+. Therefore, the sensor 1 can be employed as a practical fluorescent chemosensor for recognition of Al3+ in aqueous solution.

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