A Paramagnetic Compass Based on Lanthanide Metal-Organic Framework

被引：8

作者：

Jia, Hao ^{[1
,2
]}

Yin, Baipeng ^{[1
]}

Chen, Jiaying ^{[1
,3
]}

Zou, Ye ^{[1
]}

Wang, Hong ^{[1
,2
]}

Zhang, Yu ^{[1
,2
]}

Ma, Tongmei ^{[3
]}

Shi, Qiang ^{[1
]}

Yao, Jiannian ^{[1
]}

Bai, Shuming ^{[1
]}

Zhang, Chuang ^{[1
]}

机构：

[1] Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510641, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2023年 / 62卷 / 35期

基金：

中国国家自然科学基金;

关键词：

Lanthanides; Magnetic Anisotropy; Magnetic Materials; Metal-Organic Frameworks; Paramagnetism; MAGNETIC-ANISOTROPY; ORIENTATION; COMPLEXES;

D O I：

10.1002/anie.202309073

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Macroscopic compass-like magnetic alignment at low magnetic fields is natural for ferromagnetic materials but is seldomly observed in paramagnetic materials. Herein, we report a "paramagnetic compass" that magnetically aligns under & SIM;mT fields based on the single-crystalline framework constructed by lanthanide ions and organic ligands (Ln-MOF). The magnetic alignment is attributed to the Ln-MOF's strong macroscopic anisotropy, where the highly-ordered structure allows the Ln-ions' molecular anisotropy to be summed according to the crystal symmetry. In tetragonal Ln-MOFs, the alignment is either parallel or perpendicular to the field depending on the easiest axis of the molecular anisotropy. Reversible switching between the two alignments is realized upon the removal and re-adsorption of solvent molecules filled in the framework. When the crystal symmetry is lowered in monoclinic Ln-MOFs, the alignments become even inclined (47 & DEG;-66 & DEG;) to the field. These fascinating properties of Ln-MOFs would encourage further explorations of framework materials containing paramagnetic centers.

引用

页数：10

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