New Valence-Sandwich [MnII4MnIII4MnII4] Aggregate Showing Single-Molecule Magnet Behavior

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• 作者：Yangguang Li ; Wolfgang Wernsdorfer ; Rodolphe Cl&eacute ; rac ; Ian J. Hewitt ; Christopher E. Anson ; and Annie K. Powell
• 刊名：Inorganic Chemistry
• 出版年：2006
• 出版时间：March 20, 2006
• 年：2006
• 卷：45
• 期：6
• 页码：2376 - 2378
• 全文大小：142K
• 年卷期：v.45,no.6(March 20, 2006)
• ISSN：1520-510X

文摘

The reaction of manganese(II) acetate, 1,1,1-tris(hydroxymethyl)methane (H₃thme), and triethylamine in methanol leads to theformation of [Mn₁₂O₂(OMe)₂(thme)₄(OAc)₁₀(H₂O)₄]·2MeOH. The[Mn^III₄Mn^II₈] core consists of a central [Mn^III₄O₆] rhombus sandwichedby two [Mn^II₄O₇] fragments. Frequency-dependent ac susceptibilityand hysteresis loops in the magnetization indicate single-moleculemagnet behavior with a pure quantum-tunneling regime ofrelaxation below 0.2 K.