Synthesis of Poly(phenyltriazolylcarboxylate)s with Aggregation‐Induced Emission Characteristics by Metal‐Free 1,3‐Dipolar Polycycloaddition of Phenylpropiolate and Azides

Two soluble poly(phenyltriazolylcarboxylate)s (PPTCs) with high molecular weights (M _w up to 26 800) are synthesized by the metal‐free 1,3‐dipolar polycycloadditions of 4,4′‐isopropylidenediphenyl diphenylpropiolate ( 1 ) and tetraphenylethene‐containing diazides ( 2 ) in dimethylformamide at 150 °C for 12 h in high yields (up to 93%). The resultant polymers are soluble in common organic solvents and are thermally stable with 5% weight loss temperatures higher than 375 °C. The PPTCs are nonemissive in solutions, but become highly luminescent upon aggregation, showing a phenomenon of aggregation‐induced emission. Their aggregates can be used as fluorescent chemosensors for high‐sensitivity detection of explosives.