{"id":10776,"date":"2021-02-25T16:39:00","date_gmt":"2021-02-25T15:39:00","guid":{"rendered":"https:\/\/lncmi.cnrs.fr\/non-classifiee\/key-role-of-magnetic-dipole-allowed-transitions-in-magneto-chiral-dichroism-2\/"},"modified":"2025-03-12T11:58:54","modified_gmt":"2025-03-12T10:58:54","slug":"key-role-of-magnetic-dipole-allowed-transitions-in-magneto-chiral-dichroism-2","status":"publish","type":"post","link":"https:\/\/lncmi.cnrs.fr\/en\/news\/key-role-of-magnetic-dipole-allowed-transitions-in-magneto-chiral-dichroism-2\/","title":{"rendered":"Key Role of Magnetic-Dipole Allowed Transitions in Magneto-Chiral Dichroism"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"705\" height=\"737\" src=\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/06\/articleCT-image.jpg\" alt=\"\" class=\"wp-image-9393\" srcset=\"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/06\/articleCT-image.jpg 705w, https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/06\/articleCT-image-480x502.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 705px, 100vw\" \/><\/figure>\n\n<p>the Magneto-Chiral Dichroism (MChD) detected up to 5 T through Visible and Near Infrared light absorption of {Er<sub>5<\/sub>Ni<sub>6<\/sub>} metal clusters obtained by reaction of enantiopure chiral ligands, namely (<em>R<\/em>\/<em>S<\/em>)-(2-hydroxy-3-methoxybenzyl)-serine) and Ni<sup>II<\/sup> and Er<sup>III<\/sup> precursors is reported. Single-crystal diffraction analysis reveals that these compounds are <em>3d-4f<\/em> heterometallic clusters showing helical chirality. They are isostructural to the recently reported {Ln<sub>5<\/sub>Ni<sub>6<\/sub>}(Ln = Dy<sup>III<\/sup>, Y<sup>III<\/sup>) chiral clusters that have shown multi-metal site MChD. The analysis of absorption and MChD spectra show a high g<sub>MChD<\/sub> dissymmetry factor of ca. 0.24 T<sup>-1<\/sup> (<em>T<\/em> = 4.0 K, <strong><em>B<\/em><\/strong> = 1.0 T) for the <sup>4<\/sup>I<sub>15\/2<\/sub> \u2190 <sup>4<\/sup>I<sub>13\/2 <\/sub>magnetic-dipole allowed electronic transition of the Er<sup>III<\/sup> centers. This record value is an order of magnitude higher than that observed for the electronic transition of the Dy<sup>III<\/sup> centers in an isostructural analogue. The <em>d-d<\/em> electronic transitions of the Ni<sup>II<\/sup> ions and the other <em>f-f<\/em> electric-dipole induced transitions of Er<sup>III<\/sup> centers provide g<sub>MChD<\/sub> factors one or two order of magnitude lowers. These findings clearly show the key role of magnetic-dipole allowed transitions for high MChD effects in lanthanide-based systems, paving for a rational design for original highly MChD responsive chiral lanthanide systems.<\/p>\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<ul class=\"wp-block-list\">\n<li>Enhancement of Magneto-Chiral Dichroism Intensity by Chemical <a class=\"ek-link\">Substitution<\/a> : The Key Role of Magnetic-Dipole Allowed Transitions<\/li>\n<\/ul>\n\n\n\n<p>C. Y. Li, L. C. Adi, K. Paillot, I. Breslavetz, L. S. Long, L. S. Zheng, G. L. J. A. Rikken, <strong>C. Train<\/strong>, X.-J. Kong* et M. Atzori* J. Am. Chem. Soc. 2024, 146, (doi : 10.1021\/jacs.4c06503)<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><a href=\"https:\/\/pubs-acs-org.inp.bib.cnrs.fr\/doi\/10.1021\/jacs.4c06503\">https:\/\/pubs-acs-org.inp.bib.cnrs.fr\/doi\/10.1021\/jacs.4c06503<\/a><\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>the Magneto-Chiral Dichroism (MChD) detected up to 5 T through Visible and Near Infrared light absorption of {Er5Ni6} metal clusters obtained by reaction of enantiopure chiral ligands, namely (R\/S)-(2-hydroxy-3-methoxybenzyl)-serine) and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9810,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6123,6124,292],"tags":[],"post_folder":[],"class_list":["post-10776","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chirality-and-magnetism","category-chirality-and-magnetism-news","category-news"],"jetpack_featured_media_url":"https:\/\/lncmi.cnrs.fr\/wp-content\/uploads\/2024\/06\/articleCT-image.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts\/10776","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/comments?post=10776"}],"version-history":[{"count":0,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/posts\/10776\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media\/9810"}],"wp:attachment":[{"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/media?parent=10776"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/categories?post=10776"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/tags?post=10776"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/lncmi.cnrs.fr\/en\/wp-json\/wp\/v2\/post_folder?post=10776"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}