Multi-layer 3D chiral polymer with AIE for dual-channel fluorescent detection of Ba ²⁺ and Cr ⁶⁺ ions

We report the synthesis and characterization of a novel multi-layer three-dimensional (3D) chiral polymer, strategically constructed from boron pinacol ester (Bpin)-based building blocks. The intricate 3D architecture endows the polymer with distinct aggregation-induced emission (AIE) characteristics, attributed to restricted intramolecular rotation. Capitalizing on its AIE activity and unique internal coordination environment, this polymer functions as a highly effective dual-channel fluorescent probe. It demonstrates selective and sensitive detection of environmentally toxic ions, specifically barium (Ba2+) and hexavalent chromium (Cr6+), through distinct fluorescence responses. This work demonstrates the proof-of-concept potential of tailored 3D chiral polymers as dual-channel fluorescent sensors in simplified and filtered natural water matrices, while identifying matrix interference as a key challenge for real-world deployment.