A Mixed 3d-4f 14-Metallacrown-5 Complex That Displays Slow Magnetic Relaxation through Geometric Control of Magnetoanisotropy

被引：93

作者：

Boron, Thaddeus T., III ^{[1
]}

Kampf, Jeff W. ^{[1
]}

Pecoraro, Vincent L. ^{[1
]}

机构：

[1] Univ Michigan, Dept Chem, Willard H Dow Labs, Ann Arbor, MI 48109 USA

来源：

INORGANIC CHEMISTRY | 2010年 / 49卷 / 20期

基金：

美国国家科学基金会;

关键词：

SINGLE-MOLECULE MAGNETS; BEHAVIOR; ION;

D O I：

10.1021/ic101121d

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

We describe the synthesis and magnetic properties of a unique mixed 3d-4f 14-metallacrown-5 complex. This is the first metallacrown family to feature mu-O and mu-OH bridges as well as to incorporate a Ln(lll) ion into the ring. Alternating-current SQUID magnetometry of the Tb, Dy, and Ho derivatives reveals slow magnetic relaxation, a hallmark property of single-molecule magnets. For the Dy structure (4), an effective energy barrier U-eff of 16.7 K and a relaxation time of 4.9 x 10(-8) s were calculated. Because of the relatively small total spin, this behavior most likely results from a large magnetoanisotropy, which is controlled through geometric constraints.

引用

页码：9104 / 9106

页数：3

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