CoII Molecular Square with Single-Molecule Magnet Properties

被引：78

作者：

Wu, Dayu ^{[1
]}

Guo, Dong ^{[1
]}

Song, You ^{[1
]}

Huang, Wei ^{[1
]}

Duan, Chunying ^{[1
]}

Meng, Oingjin ^{[1
]}

Sato, Osamu ^{[2
]}

机构：

[1] Nanjing Univ, State Key Lab Coordinat Chem, Nanjing 210093, Peoples R China

[2] Kyushu Univ, Inst Mat Chem & Engn, Fukuoka 8168580, Japan

来源：

INORGANIC CHEMISTRY | 2009年 / 48卷 / 03期

基金：

中国国家自然科学基金;

关键词：

MAGNETIZATION; MONONUCLEAR; COMPLEXES; DINUCLEAR; CRYSTAL; LIGANDS; CLUSTER; FAMILY; MN;

D O I：

10.1021/ic8012188

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A new tetranuclear cobalt(II) molecular square in which adjacent Co-II centers are linked by a mu(2)-bridging oxygen atom and a N-N bridge along the edges of the square has been designed for single-molecule magnets (SMMs) with high anisotropy barriers. The overall intramolecular ferromagnetic coupling at low temperature combined with the slow relaxation at static zero fields suggests a SMM behavior for this molecular square. The zero-field cooled magnetization (ZFCM) and field cooling magnetization (FCM) at 10 Oe illustrate the nonreversibility and bifurcation below 4.5 K. The deviations of magnetization from the saturated value in strong applied fields demonstrate the participation of low-lying excited states. The peaks of the out-of-phase signals are observed corresponding to coincidence of the applied ac field oscillation frequency with the relaxation rate.

引用

页码：854 / 860

页数：7

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