Vinylene-versus azomethine-bridged carbazole-based polymers for light emission and sensor applications

Two new carbazole-based soluble ?-conjugated polymers were synthetized and investigated: P1 is a poly(p-phenylenevinylene) analogue P2 poly-azomethine-type polymer. The macromolecular structures of confirmed by nuclear magnetic resonance infrared spectroscopies. effect vinylene (in P1) azomethine P2) ?-linkers on thermal, optical electrical properties the two macromolecules was mainly studied. differential scanning calorimetry thermogravimetric analyses showed that both are amorphous better thermal stability observed in case containing photophysical behavior these systems investigated UV–visible absorption photoluminescence Schottky single-layer diodes Organic Field-Effect Transistors (OFETs) using as active layers elaborated order to study polymeric materials. semi-conducting fluorescent polymer, with yellowish-green emission charge carrier mobility 5.1 10?6 m²/V.s making it good candidate for organic light emitting devices (OLED) applications. However, poly-azomethine P2, its neutral state, little interest when compared polyvinylene derivative, due very low transport capacity negligible fluorescence intensity. We demonstrate this can be dramatically improved nitrogen protonation linkers. Indeed, under exposure trifluoroacetic acid (TFA) vapors, an emitted linear function amount TFA added solution 7 10?5 achieved. This opens way azomethine-containing promising applications turn-on sensors.