New Families of Hetero-tri-spin 2p鈭?d鈭?f Complexes: Synthesis, Crystal Structures, and Magnetic Properties

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• 作者：L铆via B. L. Escobar ; Guilherme P. Guedes ; St茅phane Soriano ; Nivaldo L. Speziali ; Alessandro K. Jord茫o ; Anna Claudia Cunha ; Vitor F. Ferreira ; Catalin Maxim ; Miguel A. Novak ; Marius Andruh ; Maria G. F. Vaz
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：July 21, 2014
• 年：2014
• 卷：53
• 期：14
• 页码：7508-7517
• 全文大小：492K
• ISSN：1520-510X

文摘

In this work we report the synthesis, crystal structures, and magnetic behavior of 2p鈥?d鈥?f heterospin systems containing the nitroxide radical 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl radical (N₃tempo). These compounds were synthesized through a one-pot reaction by using [Cu(hfac)₂], [Ln(hfac)₃] (hfac = hexafluoroacetylacetonate, Ln = Dy^III, Tb^III or Gd^III), and the N₃tempo radical. Depending on the stoichiometric ratio used, the synthesis leads to penta- or trimetallic compounds, with molecular formulas [Cu₃Ln₂(hfac)₈(OH)₄(N₃tempo)] (Ln = Gd, Tb, Dy) and [CuLn₂(hfac)₈(N₃tempo)₂(H₂O)₂] (Ln = Gd, Dy). The magnetic properties of all compounds were investigated by direct current (dc) and alternating current (ac) measurements. The ac magnetic susceptibility measurements of Tb^III- and Dy^III-containing compounds of both families revealed slow relaxation of the magnetization, with magnetic quantum tunneling in zero field.