Kintzel Benjamin, Fittipaldi Maria, Böhme Michael, Cini Alberto, Tesi Lorenzo, Buchholz Axel, Sessoli Roberta, Plass Winfried
Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743, Jena, Germany.
Department of Physics and Astronomy, University of Florence and INSTM UdR, via Sansone 1, Sesto Fiorentino (FI), Italy.
Angew Chem Int Ed Engl. 2021 Apr 12;60(16):8832-8838. doi: 10.1002/anie.202017116. Epub 2021 Mar 9.
A cobalt(II)-based spin triangle shows a significant spin-electric coupling. [Co (pytag)(py) Cl ]ClO ⋅3 py crystallizes in the acentric monoclinic space group P2 . The intra-triangle antiferromagnetic interaction, of the order of ca. -15 cm (H=-JS S ), leads to spin frustration. The two expected energy-degenerate ground doublets are, however, separated by a few wavenumbers, as a consequence of magnetic anisotropy and deviations from threefold symmetry. The Co planes of symmetry-related molecules are almost parallel, allowing for the determination of the spin-electric properties of single crystals by EFM-ESR spectroscopy. The spin-electric effect detected when the electric field is applied in the Co plane was revealed by a shift in the resonance field. It was quantified as Δg /E=0.11×10 m V , which in terms of frequency corresponds to approximately 0.3 Hz m V . This value is comparable to what was determined for a Cu triangle despite the antiferromagnetic interaction being 20 times larger for the latter.
一种钴（II）基自旋三角形表现出显著的自旋-电耦合。[Co (pytag)(py) Cl ]ClO ⋅3 py结晶于非中心单斜空间群P2 。三角形内的反铁磁相互作用，约为 -15 cm （H=-JS S ），导致自旋受挫。然而，由于磁各向异性和与三重对称性的偏差，两个预期的能量简并基态双重态被几个波数隔开。对称相关分子的Co 平面几乎平行，这使得通过EFM-ESR光谱法测定单晶的自旋-电性质成为可能。当在Co 平面施加电场时检测到的自旋-电效应通过共振场的移动得以揭示。其被量化为Δg /E=0.11×10 m V ，就频率而言，这大约对应于0.3 Hz m V 。尽管后者的反铁磁相互作用大20倍，但该值与为铜三角形测定的值相当。
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