Slow magnetic relaxation in a europium(II) complex.

Autor: Errulat D; Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada., Harriman KLM; Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada., Gálico DA; Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada., Salerno EV; National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA., van Tol J; National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA., Mansikkamäki A; NMR Research Unit, University of Oulu, P. O. Box 3000, 90014, Oulu, Finland., Rouzières M; Univ. Bordeaux, CNRS, CRPP, UMR 5031, F-33600, Pessac, France., Hill S; National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA. shill@magnet.fsu.edu.; Department of Physics, Florida State University, Tallahassee, FL, 32306, USA. shill@magnet.fsu.edu., Clérac R; Univ. Bordeaux, CNRS, CRPP, UMR 5031, F-33600, Pessac, France. rodolphe.clerac@u-bordeaux.fr., Murugesu M; Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada. m.murugesu@uottawa.ca.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Apr 08; Vol. 15 (1), pp. 3010. Date of Electronic Publication: 2024 Apr 08.
DOI: 10.1038/s41467-024-46196-w
Abstrakt: Single-ion anisotropy is vital for the observation of Single-Molecule Magnet (SMM) properties (i.e., a slow dynamics of the magnetization) in lanthanide-based systems. In the case of europium, the occurrence of this phenomenon has been inhibited by the spin and orbital quantum numbers that give way to J = 0 in the trivalent state and the half-filled population of the 4f orbitals in the divalent state. Herein, by optimizing the local crystal field of a quasi-linear bis(silylamido) Eu II complex, the [Eu II (N{SiMePh 2 } 2 ) 2 ] SMM is described, providing an example of a europium complex exhibiting slow relaxation of its magnetization. This behavior is dominated by a thermally activated (Orbach-like) mechanism, with an effective energy barrier of approximately 8 K, determined by bulk magnetometry and electron paramagnetic resonance. Ab initio calculations confirm second-order spin-orbit coupling effects lead to non-negligible axial magnetic anisotropy, splitting the ground state multiplet into four Kramers doublets, thereby allowing for the observation of an Orbach-like relaxation at low temperatures.
(© 2024. The Author(s).)
Databáze: MEDLINE
Externí odkaz: