Sheng Wang, Deping Hu, Xiaoyan Guan, Siliang Cai ¡ 9 authors
Abstract The first example of luminescent monosubstituted polyacetylenes (monoâPAs) is presented, based on a contracted cisâcisoid polyene backbone. It has an excellent circularly polarized luminescence (CPL) performance with a high dissymmetric factor (up to the order of 10 â1 ). The luminescence stems from the helical cisâcisoid PA backbone, which is tightly fixed by the strong intramolecular hydrogen bonds, thereby reversing the energy order of excited states and enabling an emissive energy dissipation. CPL switches are facilely achieved by the solvent and temperature through reversible conformational transition. By taking advantages of fast response and high sensitivity, the thin film of monoâPAs could be used as a CPLâbased probe for quantitative detection of trifluoroacetic acid with a wider linear dynamic range than those of photoluminescence and circular dichroism. This work opens a new avenue to develop novel smart CPL materials through modulating conformational transition.