Control of the electronic and optical properties of aminoxyl radicals <i>via</i> boron complexation
Stable radicals have attracted increasing attention in recent years because of their unique electronic and optical characteristics. Aminoxyl radicals are one of the most widely studied stable radicals to date, but their applications in opto-functional materials have yet to be explored in detail. Our group previously reported the boron complexes of aminoxyl radicals exhibit near-infrared (NIR) absorption. In this work, an aminoxyl radical without boron-complexation was synthesized to elucidate the effects of boron coordination on the properties of the aminoxyl radicals. The results of electron spin resonance spectroscopy, ultraviolet-visible-NIR absorption measurements, and density functional theory calculations indicated that boron complexation facilitated spin delocalization over the radical π-frameworks. Furthermore, a π-extended aminoxyl radical-boron complex exhibited a significant wavelength-shift to longer wavelengths in the NIR-II absorption region, thereby reflecting its larger π-conjugated radical skeleton.
Authors
- Yuta Nishina (ORCID: https://orcid.org/0000-0002-4958-1753)
- Hiroki Fukumoto (ORCID: https://orcid.org/0000-0002-7066-3411)
- Koichiro Masada (ORCID: https://orcid.org/0000-0002-5857-7342)
- Yoshiyuki Mizuhata (ORCID: https://orcid.org/0000-0001-5301-0024)
- Ryo Inoue (ORCID: https://orcid.org/0000-0002-8966-7826)
- Kazuya Kubo (ORCID: https://orcid.org/0000-0003-0981-9410)
- Toshiyuki Oshiki (ORCID: https://orcid.org/0000-0002-9816-2731)
- Risa Hyakutake
- Takuma Kuroda
- Tomohiro Agou (ORCID: https://orcid.org/0000-0002-9133-190X)
- Takahiro Sasamori (ORCID: https://orcid.org/0000-0001-5410-8488)
- Marika Nakamura
- Peiyuan Yang
Institutions
- University of Tsukuba (JP)
- Okayama University (JP)
- University of Hyogo (JP)
- Kyoto University (JP)
- Kyoto University Institute for Chemical Research
- Ibaraki University (JP)
- Hitachi (Japan) (JP)
Publication Details
- Journal
- Dalton Transactions
- Published
- 2024-11-20
- DOI
- https://doi.org/10.1039/d4dt02973a
- Citations
- 3
- Primary Topic
- Organic Light-Emitting Diodes Research
- Type
- article
- Field-Weighted Citation Impact
- 0.63
Funders
- Iwatani Naoji Foundation
- Iketani Science and Technology Foundation
- Murata Science Foundation
- Amano Institute of Technology
- Hitachi Global Foundation
- Japan Society for the Promotion of Science
- Institute for Chemical Research, Kyoto University