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Identical Anomalous Raman Relaxation Exponent in a Family of Single Ion Magnets: Towards Reliable Raman Relaxation Determination?

preprint
submitted on 09.07.2020, 13:37 and posted on 10.07.2020, 10:25 by Gabriela Handzlik, Michał Magott, Mirosław Arczyński, Alena M. Sheveleva, Floriana Tuna, Stanisław Baran, Dawid Pinkowicz
Propeller-like lanthanide complexes with suitable chiral ligand scaffolds are highly desired as they combine chirality and magnetic bistability. However, the library of relevant chiral molecules is quite limited. Herein we present the preparation, structures, magnetic behavior as well as EPR studies of a series of propeller-shaped lanthanide Single Ion Magnets (SIMs). Coordination of the smallest helicene-type molecule 1,10-phenanthroline-N,N’-dioxide (phendo) to LnIII ions results in the formation of homoleptic complexes [LnIII(phendo)4](NO3)3∙xMeOH (Ln = Gd, Er, Yb) Gd, Er and Yb, where four phendos encircle the metal center equatorially in a four-bladed propeller fashion. The magnetization dynamics in these systems is studied by magnetic measurements and EPR spectroscopy for non-diluted as well as solid state dilutions of Er and Yb in a diamagnetic [YIII(phendo)4](NO3)3∙xMeOH (Y) matrix. Careful analysis of the slow magnetic relaxation in the diluted samples can be described by a combination of Raman and Orbach relaxation mechanisms. The most important finding concerns the identical power law τ ≈ T -3 describing the anomalous Raman relaxation for all three reported compounds diluted in the Y matrix. This identical power law strongly suggests that the exponent of the Raman relaxation process in the series of solid-state diluted isostructural compounds is practically independent of the metal ion (as long as the molar mass changes are negligible) and highlights a possible strategy towards a reliable Raman relaxation determination.

Funding

Quantum nanomagnets based on metal complexes with unusual geometry and the use of new, non-standard ligands.

National Science Center

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Functionalized helices in the construction of molecular magneto-optical materials.

Ministry of Science and Higher Education

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Molspin COST Action CA15128

History

Email Address of Submitting Author

dawid.pinkowicz@uj.edu.pl

Institution

Jagiellonian University

Country

Poland

ORCID For Submitting Author

0000-0002-9958-3116

Declaration of Conflict of Interest

No conflicts to declare

Version Notes

vesion 1.0

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