Peripherally Donor-Installed 7,8-Diaza[5]helicenes as a Platform for Helical Luminophores
| Autor: | David C. Grenz, Youhei Takeda, Marli Ferreira, Satoshi Minakata, Takahito Kaihara, Norimitsu Tohnai, Birgit Esser, Shimpei Goto, Takumu Yoshida, Tomoyuki Ikai, Marcel Bovenkerk, Przemyslaw Data, Patrycja Stachelek, Yuta Ikari |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Mechanochromic luminescence 010405 organic chemistry Organic Chemistry Solid-state Electron Electron acceptor 010402 general chemistry 01 natural sciences Fluorescence Catalysis 0104 chemical sciences chemistry.chemical_compound Crystallography chemistry Helicene OLED Luminescence |
| Zdroj: | Synthesis. 53:1584-1596 |
| ISSN: | 1437-210X 0039-7881 |
| Popis: | A new family of emissive donor–acceptor–donor (D-A-D) compounds has been developed by introducing two electron donors into the 7,8-diaza[5]helicene core as a novel helical electron acceptor. The X-ray crystallographic analyses revealed the uniquely twisted and helical structures of these compounds in the solid states. Notably, some D-A-D compounds developed herein display distinct mechanochromic luminescence (MCL) in the solid state, and a D-A-D helicene shows circularly polarized luminescence (CPL) with a relatively high luminescence dissymmetry factor g lum of ca. 10–3. Time-resolved spectroscopic analysis revealed the aspects of thermally activated delayed fluorescence characters of the helicenes. Furthermore, the emissive helicenes were applied to organic light-emitting diodes as emitters. |
| Databáze: | OpenAIRE |
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