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Identical anomalous Raman relaxation exponent in a family of single ion magnets: towards reliable Raman relaxation determination?

Authors :
Handzlik G
Magott M
Arczyński M
Sheveleva AM
Tuna F
Baran S
Pinkowicz D
Source :
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2020 Sep 14; Vol. 49 (34), pp. 11942-11949. Date of Electronic Publication: 2020 Aug 19.
Publication Year :
2020

Abstract

Propeller-like lanthanide complexes with suitable chiral ligand scaffolds are highly desired as they combine chirality with possible magnetic bistability. However, the library of relevant chiral lanthanide-based 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 Ln <superscript>III</superscript> ions results in the formation of homoleptic complexes [Ln <superscript>III</superscript> (phendo) <subscript>4</subscript> ](NO <subscript>3</subscript> ) <subscript>3</subscript> ·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 [Y <superscript>III</superscript> (phendo) <subscript>4</subscript> ](NO <subscript>3</subscript> ) <subscript>3</subscript> ·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 <superscript>-3</superscript> 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 experimental strategy towards reliable Raman relaxation determination.

Details

Language :
English
ISSN :
1477-9234
Volume :
49
Issue :
34
Database :
MEDLINE
Journal :
Dalton transactions (Cambridge, England : 2003)
Publication Type :
Academic Journal
Accession number :
32812595
Full Text :
https://doi.org/10.1039/d0dt02439b