Hydroxide-bridged five-coordinate DyIII single-molecule magnet exhibiting the record thermal relaxation barrier of magnetization among lanthanide-only dimers

被引：183

作者：

Xiong, Jin ^{[1
]}

Ding, Hai-Yan ^{[2
]}

Meng, Yin-Shan ^{[1
]}

Gao, Chen ^{[1
]}

Zhang, Xue-Jing ^{[3
]}

Meng, Zhao-Sha ^{[1
]}

Zhang, Yi-Quan ^{[2
]}

Shi, Wei ^{[3
]}

Wang, Bing-Wu ^{[1
]}

Gao, Song ^{[1
]}

机构：

[1] Peking Univ, State Key Lab Rare Earth Mat Chem & Applicat, Coll Chem & Mol Engn, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China

[2] Nanjing Normal Univ, Sch Phys Sci & Technol, Jiangsu Key Lab NSLSCS, Nanjing 210023, Jiangsu, Peoples R China

[3] Nankai Univ, Collaborat Innovat Ctr Chem Sci & Engn Tianjin, State Key Lab Elementoorgan Chem, Dept Chem,Key Lab Adv Energy Mat Chem,MOE, Tianjin 300071, Peoples R China

来源：

CHEMICAL SCIENCE | 2017年 / 8卷 / 02期

关键词：

DINUCLEAR DYSPROSIUM(III) COMPLEX; COORDINATION NUMBERS; SMM BEHAVIOR; ION MAGNETS; SPIN-STATE; ANISOTROPY; FIELD; BLOCKING; PATHWAYS; EXCHANGE;

D O I：

10.1039/c6sc03621j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A hydroxide-bridged centrosymmetric Dy-III dimer with each Dy-III being five-coordinated has been synthesized using bulky hindered phenolate ligands. Magnetic studies revealed that this compound exhibits a slow magnetic relaxation of a single-ion origin together with a step-like magnetic hysteresis of the magnetic coupled cluster. The thermal relaxation barrier of magnetization is 721 K in the absence of a static magnetic field, while the intramolecular magnetic interaction is very large among reported 4f-only dimers. CASSCF calculations with a larger active space were performed to understand the electronic structure of the compound. The thermal relaxation regime and the quantum tunneling regime are well separated, representing a good model to study the relaxation mechanism of SMMs with intramolecular Dy-Dy magnetic interactions.

引用

页码：1288 / 1294

页数：7

共 52 条

[1] A ferromagnetically coupled Mn19 aggregate with a record S=83/2 ground spin state [J].