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A Paramagnetic Compass Based on Lanthanide Metal-Organic Framework.

Hao Jia1,2, Baipeng Yin1, Jiaying Chen1,3

  • 1Beijing National Laboratory for Molecular Sciences, Institute of Chemistry Chinese Academy of Sciences, Beijing, 100190, China.

Angewandte Chemie (International Ed. in English)
|July 10, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel "paramagnetic compass" using lanthanide metal-organic frameworks (Ln-MOFs). These materials exhibit macroscopic magnetic alignment in low fields, a rare phenomenon for paramagnetic substances.

Keywords:
LanthanidesMagnetic AnisotropyMagnetic MaterialsMetal-Organic FrameworksParamagnetism

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Area of Science:

  • Materials Science
  • Magnetism
  • Coordination Chemistry

Background:

  • Macroscopic magnetic alignment is common in ferromagnetic materials but rare in paramagnetic materials.
  • Paramagnetic materials typically exhibit weak magnetic responses.
  • Lanthanide ions possess significant magnetic anisotropy.

Purpose of the Study:

  • To investigate macroscopic magnetic alignment in paramagnetic materials.
  • To explore the potential of lanthanide metal-organic frameworks (Ln-MOFs) as paramagnetic compasses.
  • To understand the relationship between crystal structure and magnetic alignment.

Main Methods:

  • Synthesis of single-crystalline lanthanide metal-organic frameworks (Ln-MOFs).
  • Characterization of magnetic properties under low magnetic fields (mT range).
  • Analysis of crystal symmetry and its influence on macroscopic magnetic anisotropy.

Main Results:

  • Demonstrated macroscopic compass-like magnetic alignment in Ln-MOFs at low fields.
  • Observed alignment parallel or perpendicular to the field in tetragonal Ln-MOFs, dependent on molecular anisotropy.
  • Achieved reversible switching of magnetic alignment by manipulating solvent molecules within the framework.
  • Found inclined alignments (47°-66°) in monoclinic Ln-MOFs due to lowered crystal symmetry.

Conclusions:

  • Ln-MOFs exhibit strong macroscopic anisotropy, enabling collective magnetic alignment of paramagnetic centers.
  • Crystal symmetry plays a crucial role in determining the direction and behavior of magnetic alignment.
  • The reversible switching mechanism offers potential for tunable magnetic materials.