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Errulat D, Harriman KLM, Gálico DA, Salerno EV, van Tol J, Mansikkamäki A, Rouzières M, Hill S, Clérac R, Murugesu M. Slow magnetic relaxation in a europium(II) complex. Nat Commun 2024; 15:3010. [PMID: 38589348 PMCID: PMC11001981 DOI: 10.1038/s41467-024-46196-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 02/14/2024] [Indexed: 04/10/2024] Open
Abstract
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) EuII complex, the [EuII(N{SiMePh2}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.
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Affiliation(s)
- Dylan Errulat
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Katie L M Harriman
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Diogo A Gálico
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Elvin V Salerno
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA
| | - Johan van Tol
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA
| | | | | | - Stephen Hill
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA.
- Department of Physics, Florida State University, Tallahassee, FL, 32306, USA.
| | - Rodolphe Clérac
- Univ. Bordeaux, CNRS, CRPP, UMR 5031, F-33600, Pessac, France.
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada.
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Oyeka EE, Winiarski MJ, Świątek H, Balliew W, McMillen CD, Liang M, Sorolla M, Tran TT. Ln 2 (SeO 3 ) 2 (SO 4 )(H 2 O) 2 (Ln=Sm, Dy, Yb): A Mixed-Ligand Pathway to New Lanthanide(III) Multifunctional Materials Featuring Nonlinear Optical and Magnetic Anisotropy Properties. Angew Chem Int Ed Engl 2022; 61:e202213499. [PMID: 36194725 PMCID: PMC9828156 DOI: 10.1002/anie.202213499] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Indexed: 11/07/2022]
Abstract
Bottom-up assembly of optically nonlinear and magnetically anisotropic lanthanide materials involving precisely placed spin carriers and optimized metal-ligand coordination offers a potential route to developing electronic architectures for coherent radiation generation and spin-based technologies, but the chemical design historically has been extremely hard to achieve. To address this, we developed a worthwhile avenue for creating new noncentrosymmetric chiral Ln3+ materials Ln2 (SeO3 )2 (SO4 )(H2 O)2 (Ln=Sm, Dy, Yb) by mixed-ligand design. The materials exhibit phase-matching nonlinear optical responses, elucidating the feasibility of the heteroanionic strategy. Ln2 (SeO3 )2 (SO4 )(H2 O)2 displays paramagnetic property with strong magnetic anisotropy facilitated by large spin-orbit coupling. This study demonstrates a new chemical pathway for creating previously unknown polar chiral magnets with multiple functionalities.
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Affiliation(s)
- Ebube E. Oyeka
- Department of ChemistryClemson UniversityClemsonSC 29630USA
| | - Michał J. Winiarski
- Faculty of Applied Physics and Mathematics and Advanced Materials CenterGdansk University of Technologyul Narutowicza 11/1280-233GdanskPoland
| | - Hanna Świątek
- Faculty of Applied Physics and Mathematics and Advanced Materials CenterGdansk University of Technologyul Narutowicza 11/1280-233GdanskPoland
| | - Wyatt Balliew
- Department of ChemistryClemson UniversityClemsonSC 29630USA
| | | | - Mingli Liang
- Department of ChemistryUniversity of HoustonHoustonTX 77204USA
| | - Maurice Sorolla
- Department of Chemical EngineeringUniversity of the Philippines DilimanQuezon City1101Philippines
| | - Thao T. Tran
- Department of ChemistryClemson UniversityClemsonSC 29630USA
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