Synthesis of Optically Active,X‐Shaped,Conjugated Compounds and Dendrimers Based on Planar Chiral [2.2]Paracyclophane,Leading to Highly Emissive Circularly Polarized Luminescence |
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| Authors: | Masayuki Gon Prof Dr Yasuhiro Morisaki Risa Sawada Prof Dr Yoshiki Chujo |
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| Institution: | 1. Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan;2. Department of Applied Chemistry for Environment, School of Science and Technology, Kwansei Gakuin University, Hyogo, Japan |
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| Abstract: | Optically active, Fréchet‐type dendrimers containing an emissive X‐shaped π‐electron system as the core unit were synthesized. Gram‐scale optical resolution and transformations of 4,7,12,15‐tetrasubstituted 2.2]paracyclophanes were also carried out. The high‐generation dendrons effectively absorbed UV light and transferred energy to the core, resulting in high photoluminescence (PL) from the core. In addition, the dendrons sufficiently isolated the emissive X‐shaped conjugated core and bright emission was observed from both thin films and solutions. Intense circularly polarized luminescence (CPL) was observed from the thin film. The dendrimer films exhibited excellent optical properties, such as large molar extinction coefficients, high fluorescence quantum efficiencies, intense PL and CPL, and large CPL dissymmetry factors. |
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| Keywords: | chirality conjugation dendrimers luminescence paracyclophanes |
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