A highly selective colorimetric and fluorescent turn-on chemosensor for Al3 + based on naphthalimide derivative

• A selective colorimetric and fluorescent turn-on chemosensor for Al3 + was synthesized.
• A 1:1 stoichiometry for the L-Al3 + complex was formed with an association constant of 7.6 × 104 M− 1.
• L can serve as a naked-eye chemosensor for Al3 + ion.

A new chemosensor L based on the naphthalimide moiety was synthesized and characterized. L exhibited the high selectivity and sensitivity for Al3 + in CH3OH, along with colorimetric and fluorometric dual-signaling responses based on the joint contribution of the ICT and CHEF processes. A 1:1 stoichiometry for the L-Al3 + complex was formed with an association constant of 7.6 × 104 M− 1, and the limit of detection for Al3 + was determined as 6.9 μM. In addition, L was successfully applied to the determination of Al3 + in real water samples.

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