A new turn on coumarin-based fluorescence probe for Ga3 + detection in aqueous solution

• A new fluorescent probe based on coumarin containing l-threonine was designed and synthesized succinctly.
• The probe has been proven to be high selective and sensitive for the analysis of Ga3 + in pure water solution.
• The probe could respond to Ga3 + in a short time.
• The association constant between probe and Ga3 + was found to be 3.7 × 104 M− 1.

The probe CT was synthesized and investigated as a novel label-free chemosensor for Ga3 + detection in water. Probe CT showed remarkable selectivity and sensitivity for Ga3 + in Tris–HCl aqueous buffer solution (pH 7.0). The chemosensor responded rapidly to Ga3 + with a 1:1 stoichiometry. Meanwhile, the unapparent changes of fluorescence lifetime decays suggest the turn-on process of probe CT by Ga3 + which appears to be a static mechanism.

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