{"id":2557,"date":"2026-04-24T22:07:32","date_gmt":"2026-04-24T13:07:32","guid":{"rendered":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/?p=2557"},"modified":"2026-05-12T12:39:33","modified_gmt":"2026-05-12T03:39:33","slug":"%e8%ab%96%e6%96%87%e3%81%8c%e6%8e%b2%e8%bc%89%e3%81%95%e3%82%8c%e3%81%be%e3%81%97%e3%81%9f%e3%80%82-3","status":"publish","type":"post","link":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/2026\/04\/24\/%e8%ab%96%e6%96%87%e3%81%8c%e6%8e%b2%e8%bc%89%e3%81%95%e3%82%8c%e3%81%be%e3%81%97%e3%81%9f%e3%80%82-3\/","title":{"rendered":"\u8ad6\u6587\u304c\u63b2\u8f09\u3055\u308c\u307e\u3057\u305f\u3002"},"content":{"rendered":"\n

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Solution-Processable Near-Infrared-Absorbing Dye: Thiophene-Substituted N<\/em>-Phenylphenothiazine Radical Cations for Stable Thin Films<\/h4>\n\n\n\n

Masafumi Yano, Kengo Sakai, Minami Ueda, Koichi Mitsudo, and Yukiyasu Kashiwagi
Colorants<\/em>, 2026<\/strong>, 5(2), 14.
https:\/\/doi.org\/10.3390\/colorants5020014<\/a><\/p>\n\n\n\n

Abstract<\/strong>
We report a \u03c0-extended N<\/em>-phenylphenothiazine dye bearing thiophene substituents, designed to address the practical compromise between long-wavelength near-infrared (NIR) absorption and the isolability of a stable radical cation state. The target compound was synthesized via Suzuki\u2013Miyaura cross-coupling and exhibited good solubility in common organic solvents. Cyclic voltammetry in dichloromethane showed a reversible one-electron oxidation at E<\/em>0<\/sup> = 0.19 V vs. Fc\/Fc+<\/sup>. Chemical oxidation afforded the corresponding radical cation, which showed an intense NIR absorption maximum at 910 nm. DFT calculations support thiophene-induced narrowing of the HOMO\u2013SOMO gap and predict a pronounced bathochromic shift of the main absorption band. The radical cation was isolated as a stable PF6<\/sub>\u2212<\/sup> salt and readily processed into spin-coated films, which retained strong NIR absorption and remained stable for months under ambient conditions.<\/p>\n\n\n\n

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