Indolizino[5,6‐b]quinoxaline Derivatives: Intramolecular Charge Transfer Characters and NIR Fluorescence |
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| Authors: | Mitsuru Kojima Dr. Hironobu Hayashi Dr. Tatsuya Aotake Dr. Shinya Ikeda Dr. Mitsuharu Suzuki Prof. Dr. Naoki Aratani Dr. Daiki Kuzuhara Prof. Dr. Hiroko Yamada |
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| Affiliation: | 1. Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Nara, Japan;2. CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama, Japan |
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| Abstract: | Indolizino[5,6‐b]quinoxaline derivatives ( 1 a and 1 b ) with a push–pull structure were prepared to show intramolecular charge‐transfer properties. Compounds 1 a and 1 b are strongly fluorescent in aprotic solvents while symmetrical derivatives ( 2 a and 2 b ) were non‐fluorescent. The π‐expanded α–α linked dimer ( 10 ) of indolizino[5,6‐b]quinoxaline 1 b was serendipitously obtained to show NIR absorption over 800 nm and the fluorescence edge reached to 1400 nm. |
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| Keywords: | intramolecular charge transfer pyrrole quinoxaline single-crystal structure solvent effects |
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