Spin Chirality in a Molecular Dysprosium Triangle: the Archetype of the Non-Collinear Ising Model

Single crystal magnetic studies combined with a theoretical analysis show that cancellation of the magnetic moments in the trinuclear Dy3+ cluster [Dy3(OH)2L3Cl(H2O)5]Cl3, resulting in a non-magnetic ground doublet, originates from the non-collinearity of the single ion easy axes of magnetization of the Dy3+ ions that lie in the plane of the triangle at 120 (deg.) one from each other. This gives rise to a peculiar chiral nature of the ground non-magnetic doublet and to slow relaxation of the magnetization with abrupt accelerations at the crossings of the discrete energy levels.Comment: 4 pages and 5 figure

Self-assembly and magnetic properties of a double-propeller octanuclear copper(II) complex with a meso-helicate-type metallacryptand core

An octanuclear copper(II) complex possessing a dimer-of-tetramers structure self-assembles from a binuclear oxamatocopper(II) metallacryptand of the meso-helicate type; its magnetic behaviour is consistent with its unique double-propeller molecular topology.Pardo Marín, Emilio José, [email protected] ; Julve Olcina, Miguel, [email protected] ; Lloret Pastor, Francisco, [email protected] ; Ruiz Garcia, Rafael, [email protected]

Get under the Umbrella: A Comprehensive Gateway for Researchers on Lanthanide‐Based Single‐Molecule Magnets

International audienceAbstract The number of scientific articles that need to be considered cover a research topic is ever‐increasing and quite difficult for newcomer assimilate. This particularly true in dynamic discipline like Molecular Magnetism. In order help young researchers this field, article proposes “review reviews” also known as an “umbrella review” on lanthanide‐based single‐molecule magnets ( 4 f ‐SMM). As preamble, various bibliographic search techniques AI‐based tools search, indexing, summarization are proposed commented. Then, the main milestones ‐SMM identified. core paper, books, book articles, reviews dealing with contextualized classified by subtopics. therefore gateway field

Molecular Magnetism of Lanthanides Complexes and Networks

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Molecular Magnetism of Lanthanides Complexes and Networks

Over the last ten years a fresh air has been blowing in the field of molecular magnetism with the re-introduction of lanthanides ions as spin carriers in magnetic molecules. The strong magnetic moment and huge magnetic anisotropy of lanthanide ions has enabled significant breakthroughs in magnetic blocking temperature and related phenomena. The chemical versatility of these ions is also a strong asset as easy substitution among the lanthanides series enables isotropic, anisotropic or solid-solutions of magnetic molecules. Additionally, their outstanding luminescent properties are key features in rationalizing the single-molecule magnet (SMM) behavior and paving the way toward production of multifunctional materials. In this book, selected examples of research on molecular magnetism of lanthanides complexes and networks are presented illustrating the current dynamism of this research field

Total Determination of the Nature of Exchange Interactions in the 3d4f magnetic chain {[Cu(salen)Pr(hfac)3]2(L)}n (L=4.4 -bipyridine, pyrazine)

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Lanthanides in Extended Molecular Networks

International audienceIn the early stages of molecular magnetism, interest was focussed on the realization of bulk magnets based on molecular networks. This chapter has made a distinction between isotropic, mainly Gd3+ , and anisotropic lanthanide-based molecular networks. In the first case, 1D materials exhibit a peculiar magnetic behaviour only in a restricted class of compounds comprising nitronyl-nitroxide radicals. The ‘ferrimagnetic’ approach, introduced by Kahn, was successively extended to lanthanide ions and in particular to Gd3+ because the absence of a significant orbital contribution strongly simplified the analysis of the magnetic properties. The aim here is to provide some basic concepts of the phenomenon and to introduce some selected examples of single-chain magnets (SCMs) based on lanthanide ions. It also describes chains with a sole lanthanide ion as spin carrier. 3d-4f and 3d-3d'-4f heterometallic chains follow. Finally, chains comprising lanthanide and radical ligands conclude this chapter

Influence of ferromagnetic connection of Ising-type DyIII-based single ion magnets on their magnetic slow relaxation

et al.Two DyIII ions can be water bridged to form a textbook example of ferromagnetic short-bridged Dy-dimers where strong Ising anisotropy can be evidenced by single-crystal rotating magnetometry. The dimers present both single ion and single molecule magnet behaviour. Magnetic dilution evidences the influence of the ferromagnetic coupling on magnetic relaxation and especially quantum tunnelling. © The Royal Society of Chemistry 2013.This work was supported by Région Bretagne, Rennes Métropole, INSA Rennes, China Scholarship Council (CSC), CNRS, Université de Rennes 1, FEDER and Spanish research program MAT2011-27233-C02-02.Peer Reviewe

Hetero-bimetallic Yttrium(lll)-Rhenium(V)(salen) Tetranuclear Complex : Synthesis and Crystal Structure.

WOSInternational audienceSingle crystals of a Y(III)-Re(V)(salen) tetranuclear complex have been obtained by the reaction between the [ReO(salen)(OMe)] and Y(hfac)3 Æ 2H2O compounds (where salen2 is the N,N0-ethan-1,2-diylbis(salicylidenamine) ligand and hfac is the 1,1,1,5,5,5-hexafluo- roacetylacetonate ligand) . This crystallizes in the triclinic, space group P1 (No. 2). The lattice parameters are a = 12.222(5)A ˚ , b = 12.783(5)A ˚ , c = 15.222(4) A ˚ , a = 86.276(5), b = 82.220(5), c = 82.396(5), V = 2332.9(15) A ˚ 3 with Z = 2. The crystallographic structure of the {[Re(salen)]2O3 [Y(hfac)3(H2O)]2}(CHCl3)2(CH2Cl2)2 tetranuclear complex is composed of two terminal Y(hfac)3(H2O) moieties bridged by the linear central {[ReO(salen)]2O} entity