Synthesis of Nanoflower-Shaped Covalent Organic Framework Fluorescent Probe for Sensitive Detection of Aluminum Ions

The widespread application of aluminum has led to numerous adverse effects on organisms due to aluminum pollution. The development of materials capable of sensitively detecting aluminum is of significant importance. In this study, we synthesized a two-dimensional fluorescent covalent organic framework material with nanoflower morphology (TAPB-DMTP-COF) for the sensitive detection of aluminum ions. The coordination binding between the nitrogen atoms on the imine bonds and the oxygen atoms on the methoxy groups in Al3+ and TAPB-DMTP-COF restricts intramolecular rotation, leading to enhanced emission. The suppression of photo-induced electron transfer (PET) through coordinated binding further triggers the "turn-on" emission, achieving fluorescence sensing of aluminum ions. The sensor exhibits high sensitivity, selectivity, and a wide detection range for aluminum ions. We have provided ideas for the convenient and rapid detection of aluminum ions in our work.