Circularly polarized luminescence (CPL) of unsubstituted helicenes is weak due to their low fluorescence quantum yield (Φ_f) and small dissymmetry factor (g_CPL). In this study, we designed and synthesized a donor-acceptor type [5]helicene, 5,10-dicyano-2,13-bis(3,4,5-tris(n-octyloxy)phenyl)[5]helicene. This helicene showed high fluorescence quantum yield (Φ_f = 0.63) and good |g_CPL| (4.2 × 10⁻³) due to symmetry-allowed transition and its helical structure. Moreover, the helicene showed solvatofluorochromism with maintaining g_CPL.

中文翻译：

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供体-受体型[5]具有强圆偏振发光的Hel烯衍生物

未取代的helicenes圆偏振发光（CPL）是它们的低的荧光量子产率（由于弱Φ _˚F）和小的不对称性因子（克_CPL）。在这项研究中，我们设计并合成了供体-受体类型的[5] ic烯，5,10-二氰基-2,13-双（3,4,5-三（正辛氧基）苯基）[5] ic烯。此螺烯显示出高的荧光量子产率（Φ _˚F = 0.63）和良好的| g _CPL | （4.2×10 ^-3）归因于对称允许的跃迁及其螺旋结构。此外，该螺旋烯在保持g _CPL的情况下显示出溶剂氟发色现象。