Tetranuclear Lanthanide Complexes Containing a Hydrazone-type Ligand. Dysprosium [2 × 2] Gridlike Single-Molecule Magnet and Toroic

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• 作者：Alexey Gusev ; Radovan Herchel ; Ivan Nemec ; Victor Shul’gin ; Igor L. Eremenko ; Kostantin Lyssenko ; Wolfgang Linert ; Zdeněk Trávníček
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：55
• 期：23
• 页码：12470-12476
• 全文大小：516K
• ISSN：1520-510X

文摘

A multidentate hydrazone-type ligand (Z,Z)-bis(1-(pyridin-2-yl)-1-amino-methylidene)oxalohydrazide (H₂L) was utilized in the synthesis of three new isomorphous tetranuclear complexes of the general formula [Ln₄(HL)₄(H₂L)₂(NO₃)₄](NO₃)₄·4CH₃OH (Ln = Gd^III, 1, Tb^III, 2, Dy^III, 3) with the gridlike [2 × 2] topology. The analysis of the static magnetic data revealed weak anti-ferromagnetic interaction among lanthanide(III) atoms, whereas dynamic magnetic data led to the observation of the single-molecule magnet behavior in zero static magnetic field for the Dy₄ compound 3 with U_eff = 42.6 K and τ₀ = 1.50 × 10^–5 s. The theoretical CASSCF calculations supported also the presence of the net toroidal magnetic moment, which classifies compound 3 also as a single-molecule toroic.