{"id":464,"date":"2020-10-06T10:03:39","date_gmt":"2020-10-06T09:03:39","guid":{"rendered":"http:\/\/lclac.chimie.unistra.fr\/?page_id=464"},"modified":"2020-10-14T11:09:20","modified_gmt":"2020-10-14T10:09:20","slug":"rotaxanes-and-molecular-motion","status":"publish","type":"page","link":"https:\/\/clic.chimie.unistra.fr\/?page_id=464","title":{"rendered":"Rotaxanes and Molecular motion"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-family: trebuchet ms, geneva, sans-serif;\">In the phenanthroline strapped porphyrin did not only provide a site for molecular recognition, it also provided a space for CuAAC reactions due to the presence of the phenanthroline binding site for copper (Figure 4). As a result, the use of bulky alkyne and azide stoppers led to the preparation of various rotaxanes species (X-ray structure Figure 4 right).<sup>1<\/sup><\/span><\/p>\n<table width=\"1132\">\n<tbody>\n<tr>\n<td><span style=\"font-family: trebuchet ms, geneva, sans-serif;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-430 size-large\" src=\"http:\/\/lclac.chimie.unistra.fr\/wp-content\/uploads\/2020\/09\/Figure-4-1-1024x511.png\" alt=\"\" width=\"1000\" height=\"499\" \/><\/span><\/td>\n<td><span style=\"font-family: trebuchet ms, geneva, sans-serif;\"><a href=\"http:\/\/lclac.chimie.unistra.fr\/wp-content\/uploads\/2020\/10\/X-ray-Movie.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-422\" src=\"http:\/\/lclac.chimie.unistra.fr\/wp-content\/uploads\/2020\/09\/Movie-Figure-4.png\" alt=\"\" width=\"300\" height=\"177\" \/><\/a><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\"><span style=\"font-family: trebuchet ms, geneva, sans-serif;\"><em><strong>Fig. 4.<\/strong> Mechanism proposed for the tandem activity of zinc and copper in CuAAC (left), X-ray structure of a rotaxane containing a free-base porphyrin in the macrocycle (right). <\/em><\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: trebuchet ms, geneva, sans-serif;\">Using this approach, a fullerene stoppered rotaxane has been prepared. Time resolved fluorescence studies performed in the group of Prof. D. Guldi in Erlangen have shown that excitation of the porphyrin induces a motion of the fullerene stoppered dumbbell and leads to long lived charge separated species in coordinating solvents.<sup> 2<\/sup><\/span><\/p>\n<ol>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/chemport-cas-org.scd-rproxy.u-strasbg.fr\/cgi-bin\/sdcgi?FID=LINK&amp;BTN=CROSSREF&amp;SID=137474-1825009364-103&amp;APP=cp_scifinder&amp;CLI=scifinder&amp;URL=https%3A%2F%2Fdoi%2Eorg%2F10%2E1002%2Fchem%2E201702553\">CuAAC in a Distal Pocket: Metal Active-Template Synthesis of Strapped-Porphyrin [2]Rotaxanes <em>Chem. Eur. J.<\/em> (2017), 23,13579-13582<\/a>.<\/li>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/chemport-cas-org.scd-rproxy.u-strasbg.fr\/cgi-bin\/sdcgi?FID=LINK&amp;BTN=CROSSREF&amp;SID=137474-1825009364-103&amp;APP=cp_scifinder&amp;CLI=scifinder&amp;URL=https%3A%2F%2Fdoi%2Eorg%2F10%2E1039%2Fc8sc05328f\">Light triggers molecular shuttling in rotaxanes: control over proximity and charge recombination <em>Chem. Sci.<\/em> (2019), 10, 3846-3853<\/a>.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>In the phenanthroline strapped porphyrin did not only provide a site for molecular recognition, it also provided a space for CuAAC reactions due to the presence of the phenanthroline binding&#8230; <span class=\"more-link\"><a href=\"https:\/\/clic.chimie.unistra.fr\/?page_id=464\">Read More<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-464","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/clic.chimie.unistra.fr\/index.php?rest_route=\/wp\/v2\/pages\/464","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/clic.chimie.unistra.fr\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/clic.chimie.unistra.fr\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/clic.chimie.unistra.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/clic.chimie.unistra.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=464"}],"version-history":[{"count":6,"href":"https:\/\/clic.chimie.unistra.fr\/index.php?rest_route=\/wp\/v2\/pages\/464\/revisions"}],"predecessor-version":[{"id":501,"href":"https:\/\/clic.chimie.unistra.fr\/index.php?rest_route=\/wp\/v2\/pages\/464\/revisions\/501"}],"wp:attachment":[{"href":"https:\/\/clic.chimie.unistra.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=464"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}