Photochromism and efficient photothermal conversion of B ← N Lewis adducts induced by intramolecular electron transfer

Sotaro Kusumoto; Takuma Mio; Kenta Rakumitsu; Masaya Shimabukuro; Mamiko Kobayashi; Tomoya Fukui; Nobutsugu Hamamoto; Toshiharu Ishizaki; Yang Kim; Yoshihiro Koide

doi:10.1039/D4TC03640A

Photochromism and efficient photothermal conversion of B ← N Lewis adducts induced by intramolecular electron transfer†

Sotaro Kusumoto,

*^a Takuma Mio,^a Kenta Rakumitsu,

^b Masaya Shimabukuro,

^c Mamiko Kobayashi,^c Tomoya Fukui,

^de Nobutsugu Hamamoto,^f Toshiharu Ishizaki,

^g Yang Kim^h and Yoshihiro Koide*^a

Author affiliations

* Corresponding authors

^a Department of Applied Chemistry, Faculty of Chemistry and Biochemistry, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama 221-8686, Japan
E-mail: kusumoto@kanagawa-u.ac.jp, ykoide01@kanagawa-u.ac.jp

^b Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan

^c Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10, Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan

^d Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan

^e Research Center for Autonomous Systems Materialogy (ASMat), Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan

^f Department of Applied Chemistry, Faculty of Engineering, Sanyo-Onoda City University, Sanyo-Onoda, Yamaguchi 756-0884, Japan

^g Department of Chemistry, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan

^h Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan

Abstract

The unique potential of B ← N Lewis adducts, a series of compounds composed of triphenylborane and pyridine/pyrazine derivatives, was investigated, which exhibited both photochromism and remarkably high-efficiency photothermal conversion, as well as being easy to prepare. They exhibit photochromism by generating organic radicals through intramolecular electron transfer upon exposure to UV light (365 nm). This feature, which distinguishes it from other photochromic materials, allows them to function as photothermal conversion materials with high efficiency up to 82% under NIR (850 nm) irradiation, a significant leap over both inorganic and organic materials and coordination compounds. To our knowledge, this research is the first to demonstrate the potential of B ← N adducts as both photochromic and NIR photothermal materials, opening up their various applications in the future.

Journal of Materials Chemistry C

Photochromism and efficient photothermal conversion of B ← N Lewis adducts induced by intramolecular electron transfer†

Abstract

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Photochromism and efficient photothermal conversion of B ← N Lewis adducts induced by intramolecular electron transfer

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