Issue 22, 2023

Strategies to quench quantum tunneling of magnetization in lanthanide single molecule magnets

Abstract

Enhancing blocking temperature (TB) is one of the holy grails in Single Molecule Magnets(SMMs), as any future potential application in this class of molecules is directly correlated to this parameter. Among many factors contributing to a reduction of TB value, Quantum Tunnelling of Magnetisation (QTM), a phenomenon that is a curse or a blessing based on the application sought after, tops the list. Theoretical tools based on density functional and ab initio CASSCF/RASSI-SO methods have played a prominent role in estimating various spin Hamiltonian parameters and establishing the mechanism of magnetization relaxation in this class of molecules. Particularly, various strategies to quench QTM effects go hand-in-hand with experiments, and different methods proposed to quell QTM effects are scattered in the literature. In this perspective, we have explored various approaches that are proposed in the literature to quench QTM effects, and these include the role of (i) local symmetry of lanthanides, (ii) super-exchange interaction in {3d–4f} complexes, (iii) direct-exchange interaction in {radical-4f} and metal–metal bonded complexes to suppress the QTM, (iv) utilizing external stimuli such as an electric field or pressure to modulate the QTM and (v) avoiding QTM effects by stabilising toroidal states in 4f and {3d–4f} clusters. We believe the strategies summarized here will help to design new-generation SMMs.

Graphical abstract: Strategies to quench quantum tunneling of magnetization in lanthanide single molecule magnets

Article information

Article type
Feature Article
Submitted
08 Nov. 2022
Accepted
07 Febr. 2023
First published
08 Febr. 2023

Chem. Commun., 2023,59, 3206-3228

Strategies to quench quantum tunneling of magnetization in lanthanide single molecule magnets

A. Swain, T. Sharma and G. Rajaraman, Chem. Commun., 2023, 59, 3206 DOI: 10.1039/D2CC06041H

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