{"id":196,"date":"2019-06-07T08:48:04","date_gmt":"2019-06-07T06:48:04","guid":{"rendered":"http:\/\/perso.ens-lyon.fr\/denis.frath\/?p=196"},"modified":"2020-04-23T17:05:13","modified_gmt":"2020-04-23T15:05:13","slug":"photo-redox-responsive-2d-supramolecular-assembly-involving-cucurbit8uril-and-a-star-shaped-porphyrin-tecton","status":"publish","type":"post","link":"https:\/\/perso.ens-lyon.fr\/denis.frath\/2019\/06\/07\/photo-redox-responsive-2d-supramolecular-assembly-involving-cucurbit8uril-and-a-star-shaped-porphyrin-tecton\/","title":{"rendered":"Photo\/Redox-Responsive 2D-Supramolecular Assembly Involving Cucurbit[8]uril and a Star-Shaped Porphyrin Tecton"},"content":{"rendered":"<p>Our article is available to read at <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0013468619310102\" target=\"_blank\" rel=\"noopener\">Electrochim. Acta<\/a><\/p>\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0013468619310102\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-219 alignleft\" src=\"http:\/\/perso.ens-lyon.fr\/denis.frath\/wp-content\/uploads\/2020\/04\/Image1-300x243.png\" alt=\"\" width=\"300\" height=\"243\" srcset=\"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-content\/uploads\/2020\/04\/Image1-300x243.png 300w, https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-content\/uploads\/2020\/04\/Image1-768x621.png 768w, https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-content\/uploads\/2020\/04\/Image1.png 832w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>The present paper reports on the formation and on the electrochemical\/spectroscopic characterization of inclusion complexes formed in aqueous media between cucurbit[7 or 8]urils cavitands (CB[7], CB[8]) and a rigid four-pointed star-shaped viologen-appended porphyrin tecton. The formation of discrete 4:1 pseudo-rotaxane-like caviplexes, involving threading of CB[n] rings on the rigid viologen-based star&rsquo;s branches has been demonstrated by nuclear magnetic resonance and mass spectrometry measurements. Then, the photo- and redox-triggered formation of 2D supramolecular assemblies involving CB[8]s and the four electron reduced tectons as key building elements, has been established on the ground of in-depth electrochemical and spectroscopic analyses supported by quantum calculations. The CB[8]-promoted intermolecular \u03c0-dimerization of the viologen cation radicals introduced at the <em>meso<\/em> positions of the porphyrin plateform has been brought to light through the diagnostic signatures of the 1:2 host-guest ternary caviplexes formed between viologen and CB[8] and by spectroscopic data collected after electrochemical, chemical or photochemical reduction of the viologen-based tectons. The CB[8] hosts not only proved useful to promote the redox-triggered formation of supramolecular assemblies, it was also found to prevent the chemical reduction of the porphyrin ring in aqueous media and its subsequent conversion into phlorin products.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Our article is available to read at Electrochim. Acta The present paper reports on the formation and on the electrochemical\/spectroscopic characterization of inclusion complexes formed in aqueous media between cucurbit[7 or 8]urils cavitands (CB[7], CB[8]) and a rigid four-pointed star-shaped viologen-appended porphyrin tecton. The formation of discrete 4:1 pseudo-rotaxane-like caviplexes, involving threading of CB[n] rings [&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-196","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\/196","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=196"}],"version-history":[{"count":10,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/posts\/196\/revisions"}],"predecessor-version":[{"id":266,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/posts\/196\/revisions\/266"}],"wp:attachment":[{"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/media?parent=196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/categories?post=196"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/perso.ens-lyon.fr\/denis.frath\/wp-json\/wp\/v2\/tags?post=196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}