Heterometallic Cubanes: Syntheses, Structures, and Magnetic Properties of Lanthanide(III)鈭扤ickel(II) Architectures

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• 作者：Yajie Gao ; Lang Zhao ; Xuebin Xu ; Gong-Feng Xu ; Yun-Nan Guo ; Jinkui Tang ; Zhiliang Liu
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：February 21, 2011
• 年：2011
• 卷：50
• 期：4
• 页码：1304-1308
• 全文大小：790K
• 年卷期：v.50,no.4(February 21, 2011)
• ISSN：1520-510X

文摘

Reactions of lanthanide(III) perchlorate (Ln = Dy, Tb, and Gd), nickel(II) acetate, and ditopic ligand 2-(benzothiazol-2-ylhydrazonomethyl)-6-methoxyphenol (H₂L) in a mixture of methanol and acetone in the presence of NaOH resulted in the successful assembly of novel Ln₂Ni₂ heterometallic clusters representing a new heterometallic 3d鈭?f motif. Single-crystal X-ray diffraction reveals that all compounds are isostructural, with the central core composed of distorted [Ln₂Ni₂O₄] cubanes of the general formula [Ln₂Ni₂(渭₃-OH)₂(OH)(OAc)₄(HL)₂(MeOH)₃](ClO₄)路3MeOH [Ln = Dy (1), Tb (2), and Gd (3)]. The magnetic properties of all compounds have been investigated. Magnetic analysis on compound 3 indicates ferromagnetic Gd路路路Ni exchange interactions competing with antiferromagnetic Ni路路路Ni interactions. Compound 1 displays slow relaxation of magnetization, which is largely attributed to the presence of the anisotropic Dy^III ions, and thus represents a new discrete [Dy₂Ni₂] heterometallic cubane exhibiting probable single-molecule magnetic behavior.