A highly selective fluorescence turn-on and reversible sensor for Al3 + ion

A simple Schiff-base receptor 1 was prepared. It exhibits an “off–on-type” mode with high sensitivity in the presence of Al3 + and shows a high association constant (5.89 × 106 M− 2) toward Al3 + in DMSO–H2O (4:6 v/v) solution. The addition of EDTA to receptor 1·Al3 + complex quenches the fluorescent intensity, indicating that receptor 1 serves as a reversible chemosensor.