{"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":"2026-04-24T22:07:37","modified_gmt":"2026-04-24T13:07:37","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<p>\u8ad6\u6587\u304c\u3001Colorants\u306b\u63b2\u8f09\u3055\u308c\u307e\u3057\u305f\u3002\u305c\u3072\u3001\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading has-large-font-size\"><br>Solution-Processable Near-Infrared-Absorbing Dye: Thiophene-Substituted\u00a0<em>N<\/em>-Phenylphenothiazine Radical Cations for Stable Thin Films<\/h4>\n\n\n\n<p>Masafumi Yano, Kengo Sakai, Minami Ueda, Koichi Mitsudo, and Yukiyasu Kashiwagi<br><em>Colorants<\/em>,&nbsp;<strong>2026<\/strong>, 5(2), 14.<br><a href=\"https:\/\/doi.org\/10.3390\/colorants5020014\">https:\/\/doi.org\/10.3390\/colorants5020014<\/a><\/p>\n\n\n\n<p><strong>Abstract<\/strong><br>We report a \u03c0-extended\u00a0<em>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\u00a0<em>E<\/em><sup>0<\/sup>\u00a0= 0.19 V vs. Fc\/Fc<sup>+<\/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 PF<sub>6<\/sub><sup>\u2212<\/sup>\u00a0salt 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<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8ad6\u6587\u304c\u3001Colorants\u306b\u63b2\u8f09\u3055\u308c\u307e\u3057\u305f\u3002\u305c\u3072\u3001\u3054\u89a7\u304f\u3060\u3055\u3044\u3002 Solution-Processable Near-Infrared-Absorbing Dye: Thiophene-Substituted\u00a0N-Phe [&hellip;]<\/p>\n","protected":false},"author":97,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2557","post","type-post","status-publish","format-standard","hentry","category-seminor"],"_links":{"self":[{"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/posts\/2557","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/users\/97"}],"replies":[{"embeddable":true,"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/comments?post=2557"}],"version-history":[{"count":1,"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/posts\/2557\/revisions"}],"predecessor-version":[{"id":2558,"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/posts\/2557\/revisions\/2558"}],"wp:attachment":[{"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/media?parent=2557"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/categories?post=2557"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wps.itc.kansai-u.ac.jp\/kozoyuki\/wp-json\/wp\/v2\/tags?post=2557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}