Family of Defect-Dicubane Ni4Ln2 (Ln = Gd, Tb, Dy, Ho) and Ni4Y2 Complexes: Rare Tb(III) and Ho(III) Examples Showing SMM Behavior

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• 作者：Lang Zhao ; Jianfeng Wu ; Hongshan Ke ; Jinkui Tang
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：April 7, 2014
• 年：2014
• 卷：53
• 期：7
• 页码：3519-3525
• 全文大小：434K
• 年卷期：v.53,no.7(April 7, 2014)
• ISSN：1520-510X

文摘

Reactions of Ln^III perchlorate (Ln = Gd, Tb, Dy, and Ho), NiCl₂路6H₂O, and a polydentate Schiff base resulted in the assembly of novel isostructural hexanuclear Ni₄Ln₂ complexes [Ln = Gd (1), Tb (2), Dy (3), Ho (4)] with an unprecedented 3d鈥?f metal topology consisting of two defect-dicubane units. The corresponding Ni₄Y₂ (5) complex containing diamagnetic Y^III atoms was also isolated to assist the magnetic studies. Interestingly, complexes 2 and 3 exhibit SMM characteristics and 4 shows slow relaxation of the magnetization. The absence of frequency-dependent in-phase and out-of-phase signals for the Ni鈥揧 species suggests that the Ln ions鈥?contribution to the slow relaxation must be effectual as previously observed in other Ni鈥揇y samples. However, the observation of 蠂鈥?/i> signals with zero dc field for the Ni鈥揟b and Ni鈥揌o derivatives is notable. Indeed, this is the first time that such a behavior is observed in the Ni鈥揟b and Ni鈥揌o complexes.