Tetraphenylethylene‐Derived Tetracarboxylate Featuring AIE Properties for Dual Ion Sensing and Mechanochromic Self‐Erasable Writing

The integration of multiple functions within a single fluorescent molecule provides a promising platform for developing versatile, efficient, and cost‐effective materials with enhanced performance across diverse applications. In this study, we introduce TPEC, an aggregation‐induced emission (AIE) molecule derived from tetraphenylethylene‐based tetracarboxylate, which demonstrates multifunctional capabilities, including metal ion sensing and self‐erasable writing. TPEC exhibits amphiphilicity in water, self‐assembling into single‐layer nanosheets with robust blue fluorescence. Notably, the aqueous solution of TPEC displays a fluorescence colorimetric response to Al3+ ions and fluorescence quenching in the presence of Fe³⁺ ions. Additionally, TPEC powders undergo fluorescence colorimetric changes under mechanical stimulation, enabling self‐erasable writing on prepared paper. This study presents a straightforward strategy for the development of multifunctional luminescent materials based on the self‐assembly of a single‐component fluorophore.