Synthesis, Structures, and Magnetic Properties of Three Fluoride-Bridged Lanthanide Compounds: Effect of Bridging Fluoride Ions on Magnetic Behaviors

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• 作者：Qi Zhou ; Fen Yang ; Dan Liu ; Yu Peng ; Guanghua Li ; Zhan Shi ; Shouhua Feng
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：July 16, 2012
• 年：2012
• 卷：51
• 期：14
• 页码：7529-7536
• 全文大小：560K
• 年卷期：v.51,no.14(July 16, 2012)
• ISSN：1520-510X

文摘

A family of fluoride-bridged lanthanide compounds, [Dy^IIIF(oda)(H₂O)₃] (1, oda = oxidiacetate) and [Ln^III₂F₂(oda)₂(H₂O)₂] (Ln = Tb(2) and Dy(3)), was synthesized and characterized. To investigate the effects of bridging ligands on magnetic behaviors, two hydroxyl-bridged complexes of formulas [Ln^III₂(OH)₂(oda)₂(H₂O)₄] (Ln = Tb(4) and Dy(5)) were also synthesized. Magnetic measurements show that the magnetic behaviors of the compounds are obviously distinct. Compounds 1, 2, and 3 show ferromagnetic interactions, while only antiferromagnetic interactions are observed in compounds 4 and 5. Among these compounds, 1 and 3 show frequency-dependent ac-susceptibility indicative of slow magnetic relaxation. Because the structures of Dy₂ cores are very similar in compounds 3 and 5, it may be inferred that the differences of bridging ligands are mainly responsible for the distinct magnetic exchange interactions and relaxation dynamics.