Single-Molecule-Magnet Behavior in a [2 脳 2] Grid DyIII4 Cluster and a Dysprosium-Doped YIII4 Cluster

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• 作者：Peng-Hu Guo ; Jiang Liu ; Zi-Hao Wu ; Hua Yan ; Yan-Cong Chen ; Jian-Hua Jia ; Ming-Liang Tong
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：August 17, 2015
• 年：2015
• 卷：54
• 期：16
• 页码：8087-8092
• 全文大小：561K
• ISSN：1520-510X

文摘

Thanks to the MeCN hydrolysis in situ reaction, a [2 脳 2] square grid Dy^III₄ cluster based on a polypyridyl triazolate ligand, [Dy₄(OH)₂(bpt)₄(NO₃)₄(OAc)₂] (1), was separated successfully and characterized through single-crystal X-ray diffraction and SQUID magnetometry. The frequency-dependent signals in the out-of-phase component of the susceptibility associated with slow relaxation of the magnetization confirmed that complex 1 displays single-molecule magnet (SMM) behavior. Two distinct slow magnetic relaxation processes, with effective energy barriers U_eff1 = 93 cm^鈥? for fast relaxation and U_eff2 = 143 cm^鈥? for slow relaxation observed under a zero direct-current field, are mainly attributed to the origin of single-ion behavior, which can be further acknowledged by the magnetic investigation of a dysprosium-doped yttrium cluster. Besides, it should be noted that complex 1 represents so far the highest energy barrier among the pure Dy^III₄ SMMs.