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Strategies toward High-Temperature Lanthanide-Based Single-Molecule Magnets.

Liviu Ungur^1,2, Liviu F Chibotaru¹

¹Theory of Nanomaterials Group, Chemistry Department, Katholieke Universiteit Leuven , Celestijnenlaan 200F, 3001 Leuven, Belgium.

Inorganic Chemistry

|August 11, 2016

Summary

Lanthanide-based single-molecule magnets achieve magnetization blocking at the molecular level. Preponderant covalent binding enhances axial crystal fields, crucial for high magnetization blocking barriers in lanthanide compounds.

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Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging

Published on: July 21, 2011

Area of Science:

Materials Science
Quantum Chemistry
Nanotechnology

Background:

Single-molecule magnets (SMMs) are crucial for molecular magnetism.
Lanthanide ions offer unique magnetic properties for SMM development.
Efficient magnetization blocking is key for SMM applications.

Purpose of the Study:

To investigate physical requirements for efficient magnetization blocking in single-ion complexes.
To identify design principles for high magnetization blocking barriers in lanthanide compounds.
To explore practical schemes for implementing these principles in materials.

Main Methods:

Theoretical examination of physical requirements for magnetization blocking.
Analysis of crystal field effects on lanthanide ions.
Overview of synthetic strategies for lanthanide-based SMMs.

Main Results:

Preponderant covalent binding of lanthanide (Ln) ions significantly enhances axial crystal fields.
Lowering coordination number, designing two-coordinated complexes, and stabilizing diatomic units are effective strategies.
Diatiomic [LnX] units show potential for high blocking barriers and room-temperature applications.

Conclusions:

Covalent binding is paramount for high magnetization blocking barriers in lanthanide SMMs.
Specific structural designs can achieve robust, anisotropic units for spintronics.
Future research may lead to room-temperature molecular magnetism.