Family of Mixed 3d鈥?f Dimeric 14-Metallacrown-5 Compounds: Syntheses, Structures, and Magnetic Properties

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• 作者：Fan Cao ; Suna Wang ; Dacheng Li ; Suyuan Zeng ; Meiju Niu ; You Song ; Jianmin Dou
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：October 7, 2013
• 年：2013
• 卷：52
• 期：19
• 页码：10747-10755
• 全文大小：513K
• 年卷期：v.52,no.19(October 7, 2013)
• ISSN：1520-510X

文摘

An isomorphous family of mixed 3d鈥?f dodenuclear aggregates, {[Mn^III₈Ln₄(Clshi)₈(OAc)₆(渭₃-OCH₃)₂(渭₃-O)₂(CH₃OH)₁₂(H₂O)₂]路4CH₃OH路xH₂O)} (where Ln = Eu^III (1), Gd^III (2), Tb^III (3), and Dy^III (4); ClshiH₃ = 5-chlorosalicylhydroxamic acid; x = 5 for 1 and 3; x = 6 for 2; x = 2 for 4), were synthesized and characterized. They were obtained from the reaction of ClshiH₃ with Mn(OAc)₂路4H₂O and Ln(NO₃)₃路6H₂O. These isomorphous mixed 3d鈥?f compounds represent a family of novel structures with lanthanide ions in the metallacrown (MC) ring. Each dodecanuclear aggregate contains two offset stacked 14-MC-5 units with M鈥揘鈥揙鈥揗鈥揘鈥揙鈥揕n鈥揙鈥揘鈥揗鈥揙鈥揘鈥揗 connectivity to capture one Ln^III ion in the core of each MC. Two 14-MC-5 units are connected through O ions with four Mn ions and six O atoms arranged in a double Mn₄O₆ cubane. Magnetic measurement indicates that antiferromagnetic interactions are present between the metal ions. The Dy^III analogue with high anisotropy and large spin shows slow magnetization relaxation at a direct-current field of 2 kOe.