Magnetic properties of five planar defect dicubanes of [Ln^III₄(渭₃-OH)₂(L)₄(HL)₂]路2THF (Ln = Gd, Tb, Dy, Ho and Er)

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• 作者：Kartik Ch ; ra Mondal ; George E. Kostakis ; Yanhua Lan ; Annie K. Powell
• 关键词：Lanthanides ; Magnetism ; Single Molecule Magnet ; Schiff base
• 刊名：Polyhedron
• 出版年：13 December, 2013
• 年：2013
• 卷：66
• 期：Complete
• 页码：268-273
• 全文大小：804 K

文摘

A series of five isostructural tetranuclear defect dicubane, or butterfly, topology 4f coordination clusters of formula [Ln^III₄(渭₃-OH)₂(L)₄(HL)₂]路2THF, [H₂L = (E)-2-(2-hydroxy-3-methoxybenzylideneamino)phenol; Ln = Gd(1), Tb(2), Dy(3), Ho(4) and Er(5)) has been synthesized and characterized. The highly anisotropic Dy₄ and Ho₄ complexes clearly show intramolecular ferromagnetic coupling which arise from dominant intramolecular dipolar-dipolar interactions rather than any significant superexchange effects. Furthermore, the Dy₄ complex shows Single Molecule Magnet (SMM) behavior.