Tunable AICPL of (S)-Binaphthyl-Based Three-Component Polymers via FRET Mechanism

Five three-component chiral polymers incorporating (S)-1,1'-binaphthyl, tetraphenylethene (TPE) and fluorene moieties are designed and synthesized by Pd-catalyzed Sonogashira reaction. All these polymers show obvious aggregation induced emission enhancement response behavior in the fluorescence emission region of 460-480 nm. Interestingly, three of them show aggregation-induced circularly polarized luminescence (AICPL) signals in tetrahydrofuran-H₂ O mixtures. Most importantly, these AICPL signals can be tuned by changing the molar ratios of TPE and fluorene components through fluorescence resonance energy transfer and give the highest glum = ±4.0 × 10^-3 . This work provides a novel strategy for developing AICPL-enhanced materials.