{"id":11892,"date":"2026-01-27T07:45:51","date_gmt":"2026-01-27T06:45:51","guid":{"rendered":"https:\/\/fermi.univ-tlse3.fr\/?post_type=tribe_events&#038;p=11892"},"modified":"2026-01-30T07:47:13","modified_gmt":"2026-01-30T06:47:13","slug":"direct-determination-of-magnetic-anisotropies-in-pnictinidenes-and-feii-compounds-from-3-to-6000-cm-1-by-thz-epr-spectroscopy-tarek-al-said-lncmi-seminar-5-02-2026-14h","status":"publish","type":"tribe_events","link":"https:\/\/fermi.univ-tlse3.fr\/fr\/home\/event\/direct-determination-of-magnetic-anisotropies-in-pnictinidenes-and-feii-compounds-from-3-to-6000-cm-1-by-thz-epr-spectroscopy-tarek-al-said-lncmi-seminar-5-02-2026-14h\/","title":{"rendered":"Direct Determination of Magnetic Anisotropies in Pnictinidenes and Fe(II) compounds from 3 to 6000 cm^-1 by THz-EPR Spectroscopy. &#8211; (Tarek Al Said \/  LNCMI \/ Seminar). &#8211; 5\/02\/2026, 14H"},"content":{"rendered":"<p><span style=\"font-size: 20px; background-color: #f18500;\">Seminar LNCMI<\/span><\/p>\n<p><span style=\"font-size: 20px;\"><span style=\"color: #191970;\"><strong>Tarek Al Said <\/strong><\/span>,\u00a0Helmholtz-Zentrum Berlin f\u00fcr Materialien und Energie<\/span><\/p>\n<p><span style=\"background-color: #cecece;\">Seminar LNCMI, 5\/02\/2026, 14H, <strong>Visio<\/strong><\/span><\/p>\n<p><span style=\"font-size: 20px;\"><span style=\"color: #191970;\"><strong>Abstract<\/strong><\/span><\/span><br \/>\nThe magnetic anisotropy (zero-field splitting, ZFS) of a molecular compound is a sensitive probe for the electronic structure and can further present an important property of functional materials.<br \/>\nFor example, probing the typically large ZFS in high-spin (HS) Fe(II) compounds, gives inside in the function of related metalloenzymes or spin-crossover (SCO) compounds <strong>[1,2]<\/strong>.<br \/>\nIn molecular magnetism, a large magnitude of the anisotropy is desired to increase the spin-reversal barrier <strong>[3]<\/strong>.<br \/>\nFor an accurate determination, electron paramagnetic resonance (EPR) spectroscopy is the method of choice, however large ZFS poses serve experimental challenges for conventional EPR methods.<\/p>\n<p>To study species with large magnetic anisotropy, we employ frequency-domain Fourier-transform THz-EPR (FD-FT THz-EPR) spectroscopy at BESSY II <strong>[4]<\/strong> in a range from 3 to 6000 cm^-1 and at magnetic fields up to 10 T in conjunction with optical excitation.<br \/>\nIn this talk, examples on recent research on HS main group and transition metal compounds will be given. First, we show the EPR characterization of two mononuclear HS Fe(II) complexes <strong>[5]<\/strong>,<br \/>\nwhich serve as models for SCO compounds, and give an outlook on the possibilities to study thermally and light-induced SCO by THz-EPR.<br \/>\nSecond, studies on different triplet pnictinidenes (R\u2013Pn, Pn = As,Bi) reveal the influence of adjacent metal atoms and SOC on the electronic structure of metallo-arsinidenes (Pt\u2013 As, Pd\u2013As) <strong>[6]<\/strong><br \/>\nand demonstrate the determination of a giant axial ZFS of +5422 cm^-1 in a bismuthinidene (R\u2013Bi) <strong>[7]<\/strong>, to the best of our knowledge, the largest value experimentally determined up to now.<\/p>\n<p>Thereby, our studies establish FD-FT THz-EPR as a unique method to probe very large ZFS in order to draw robust magneto-structural correlations with implications for new magnetic materials.<\/p>\n<p><strong>[1]<\/strong> A. Ozarowski et al., J. Am. Chem. Soc 2004, 126, 6574.<br \/>\n<strong>[2]<\/strong> P. G\u00fctlich et al., Beilstein J. Org. Chem. 2013, 9, 342<br \/>\n<strong>[3]<\/strong> F. Neese and D. Pantazis, Faraday Discuss. 2011, 148, 229.<br \/>\n<strong>[4]<\/strong> J. Nehrkorn et al., J. Magn. Res. 2017, 280, 10.<br \/>\n<strong>[5]<\/strong> Manuscript in preparation<br \/>\n<strong>[6]<\/strong> M. Deben et al., J. Am. Chem. Soc 2025, 147, 5330.<br \/>\n<strong>[7]<\/strong> T. Al Said et al., J. Am. Chem. Soc 2025, 147, 84.<\/p>\n<p><strong>Lieu<\/strong> : Salle Pauthenet in Grenoble<\/p>\n<p><strong>Lien Zoom<\/strong> :\u00a0<a href=\"https:\/\/univ-grenoble-alpes-fr.zoom.us\/j\/94228207316?pwd=khTdznxeFy1ZUYkYftQ0QSox6Fz3iK.1\"><br \/>\nhttps:\/\/univ-grenoble-alpes-fr.zoom.us\/j\/94228207316?pwd=khTdznxeFy1ZUYkYftQ0QSox6Fz3iK.1<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Visio<\/p>\n","protected":false},"author":5,"featured_media":0,"template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_tribe_events_status":"","_tribe_events_status_reason":"","footnotes":""},"tags":[],"tribe_events_cat":[48,311,233],"class_list":["post-11892","tribe_events","type-tribe_events","status-publish","hentry","tribe_events_cat-events","tribe_events_cat-lncmi","tribe_events_cat-seminars","cat_events","cat_lncmi","cat_seminars"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - 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