{"id":523,"date":"2024-06-21T15:53:05","date_gmt":"2024-06-21T13:53:05","guid":{"rendered":"https:\/\/perso.ens-lyon.fr\/denis.frath\/?p=523"},"modified":"2025-05-27T17:39:21","modified_gmt":"2025-05-27T15:39:21","slug":"unprecedented-light-induced-aggregation-of-cationic-1458-naphthalenediimide-amphiphiles","status":"publish","type":"post","link":"https:\/\/perso.ens-lyon.fr\/denis.frath\/2024\/06\/21\/unprecedented-light-induced-aggregation-of-cationic-1458-naphthalenediimide-amphiphiles\/","title":{"rendered":"Unprecedented light induced aggregation of cationic 1,4,5,8-naphthalenediimide amphiphiles"},"content":{"rendered":"<p>Our article is available to read at <a href=\"https:\/\/pubs.rsc.org\/en\/content\/articlelanding\/2024\/tc\/d3tc04178f\" target=\"_blank\" rel=\"noopener\">J. Mater. Chem. C<\/a>.<\/p>\n<p><a href=\"https:\/\/pubs.rsc.org\/en\/content\/articlelanding\/2024\/tc\/d3tc04178f\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-524 alignleft\" src=\"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-content\/uploads\/2023\/09\/Get-300x112.gif\" alt=\"\" width=\"300\" height=\"112\" \/><\/a>Naphthalenediimide amphiphiles (<strong>NDI-as<\/strong>) with quaternary ammonium groups (<strong>DC4<\/strong>, <strong>DaP<\/strong>, and <strong>DaO<\/strong>) display unprecedented UV light-induced aggregation in solutions of water, acetonitrile and THF. Light-induced aggregation brings significant spectral modification by which unusual absorption band distribution is assigned to H-type aggregates. Such aggregation can be reversibly broken by heating and reassembled by photoirradiation. The irradiation\/heating cycles that provoke assembly\/disassembly process can be confirmed by <small><sup>1<\/sup><\/small>H-NMR spectroscopy. The possibility of a chemically promoted aggregation by or radical anion either anion\u2013\u03c0 interaction may be ruled out by UV-Vis, EPR and electrochemistry measurements. These photoinduced aggregates can sensitize dissolved O<small><sub>2<\/sub><\/small> to produce singlet oxygen, a surprising observation when it comes to sensitization efficiency for dyes as aggregation usually decreases sensitization yield. Laser-induced luminescence measurements corroborate the existence of monomeric and aggregate forms, as well as confirm triplet states as phosphorescence was detected, being particularly intense in concentrated THF solutions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Our article is available to read at J. Mater. Chem. C. Naphthalenediimide amphiphiles (NDI-as) with quaternary ammonium groups (DC4, DaP, and DaO) display unprecedented UV light-induced aggregation in solutions of water, acetonitrile and THF. Light-induced aggregation brings significant spectral modification by which unusual absorption band distribution is assigned to H-type aggregates. Such aggregation can be [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-523","post","type-post","status-publish","format-standard","hentry","category-article"],"_links":{"self":[{"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/posts\/523","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/comments?post=523"}],"version-history":[{"count":1,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/posts\/523\/revisions"}],"predecessor-version":[{"id":530,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/posts\/523\/revisions\/530"}],"wp:attachment":[{"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/media?parent=523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/categories?post=523"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/tags?post=523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}