A planar triangular Dy<sub>3</sub> + Dy<sub>3</sub> single-molecule magnet with a toroidal magnetic moment

Li, Xiao-Lei; Wu, Jianfeng; Tang, Jinkui; Guennic, Boris Le; Shi, Wei

doi:10.1039/c6cc05326b

Cited by 127 publications

(64 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have been involved in the design and utilization of various types of ligand families for the preparation of 3d/4f–, and 4f–,,, complexes. From our experience,, and those of others we have observed that flexible ligands that have multiple options to bind to a metal ion are often suitable to generate polynuclear complexes. Among the ligands that we have investigated, aroyl hydrazone ligands have been found to possess the following beneficial features.…”

Section: Resultsmentioning

confidence: 62%

Homometallic Dy^III Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism

Biswas

Das

Acharya

et al. 2017

Chemistry A European J

View full text Add to dashboard Cite

The synthesis, structure, and magnetic properties of four Dy coordination compounds isolated as [Dy (LH ) (μ -η :η -Piv)]Cl⋅2 MeOH⋅H O (1), [Dy (LH) (μ -OH) (Piv) (MeOH) ]⋅4 MeOH⋅2 H O (2), [Dy (LH ) (tfa) (O PtBu)(Cl) ]Cl ⋅15.5 H O⋅4 MeOH⋅5 CHCl (3) and [Dy (L) (LH) (tfa) ]Cl ⋅15 H O⋅7 MeOH⋅12 CHCl (4) are reported (Piv=pivalate, tfa=1,1,1-trifluoroacetylacetone, O PtBu=tert-butylphosphonate). Among these, 3 displays an equilateral triangle topology with a side length of 9.541 Å and a rare pentagonal-bipyramidal Dy environment, whereas complex 4 exhibits a single-stranded nanowheel structure with the highest nuclearity known for a homometallic lanthanide cluster structure. A tentative model of the dc magnetic susceptibility and the low-temperature magnetization of compounds 1 and 2 indicates that the former exhibits weak ferromagnetic intramolecular exchange interaction between the Dy ions, whereas in the latter both intramolecular ferromagnetic and antiferromagnetic magnetic exchange interactions are present. Compounds 1, 3, and 4 exhibit frequency-dependent ac signals below 15 K at zero bias field, but without exhibiting any maximum above 2 K at frequencies up to 1400 Hz. The observed slow relaxation of the magnetization suggests that these compounds could exhibit single molecule magnet (SMM) behavior with either a thermal energy barrier for the reversal of the magnetization that is not high enough to block the magnetization above 2 K, or there exists quantum tunneling of the magnetization (QTM).

show abstract

Section: Resultsmentioning

confidence: 62%

Homometallic Dy^III Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism

Biswas

Das

Acharya

et al. 2017

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…As P QTM 2 is smaller than P QTM , QTM is effectively suppressed in coupled dimers of SMMs . In the case of 4f SMMs, with a few exceptions, through‐space magnetic dipole–dipole (MD) interactions have a significant effect on the SMM behavior . When the magnetic easy axes of the magnetic dipoles are on the same straight line, only an axial component of the MD interactions exists, which scarcely affects P QTM , making P QTM 2 small.…”

Section: Introductionmentioning

confidence: 99%

“…[9] In the case of 4f SMMs, with af ew exceptions, [10][11][12][13] through-space magnetic dipole-dipole (MD) interactions have as ignificant effect on the SMM behavior. [14][15][16][17][18][19][20][21][22][23][24][25] When the magnetic easy axes of the magnetic dipoles are on the same straight line, only an axial component of the MD interactions exists, which scarcely affects P QTM ,m aking P QTM 2 small. On the other hand, in the presence of transversal MD interactions, P QTM becomes larger,a nd hence, the magnetic relaxations are faster due to the larger off-diagonal matrix elements of the coupled ground states.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Approach for Enhancing Single‐Molecule Magnet Properties of Terbium(III)‐Phthalocyaninato Double‐Decker Complexes with Crown Moieties

Horii

Kishiue

Damjanović

et al. 2018

Chemistry A European J

View full text Add to dashboard Cite

A Tb -phthalocyaninato double-decker ([1] ) single-molecule magnet (SMM) having four 15-crown-5 moieties in one of the ligands was synthesized, and its dimerization and magnetic properties were studied in an attempt to utilize the supramolecular aggregation for enhancing the SMM properties. Aggregation of [1] to form [1 K ] in the presence of K ions was studied by using UV/Vis-NIR absorption and NMR spectroscopies. For the magnetic measurements, [1] and [1 K ] were dispersed in poly(methyl methacrylate) (PMMA). UV/Vis-NIR absorption measurements on the PMMA dispersed samples were used to track the formation of [1 K ] . Direct current (DC) magnetic susceptibility measurements revealed that there were ferromagnetic Tb-Tb interactions in [1 K ] , whereas there was no indication of ferromagnetic interactions in [1] . Upon the formation of [1 K ] from [1] and K ions, the temperature at which the magnetic hysteresis occurred increased from 7 to 15 K. In addition, the area of magnetic hysteresis became larger for [1 K ] , meaning that SMM properties of [1 K ] are superior to those of [1] . Alternating current (AC) magnetic measurements were used to confirm this observation. Magnetic relaxation times at 2 K increased 1000-fold upon dimerization of [1] to [1 K ] , demonstrating the effectiveness of using K ions to induce dimer formation for the improvement of the SMM properties.

show abstract

“…A static toroidal moment exists in various materials both microscopically and macroscopically, covering transition metal ions [68], biological and chemical macromolecules [69][70][71][72][73][74], bulk crystals [75][76][77][78][79][80], and glasses [81]. In macroscopic condensed matter, formation of toroidal moments in materials plays a vital role in the asymmetric ME.…”

Section: Toroidization and Me In Materialsmentioning

confidence: 99%

Theory and applications of toroidal moments in electrodynamics: their emergence, characteristics, and technological relevance

2017

View full text Add to dashboard Cite

Dipole selection rules underpin much of our understanding in characterization of matter and its interaction with external radiation. However, there are several examples where these selection rules simply break down, for which a more sophisticated knowledge of matter becomes necessary. An example, which is increasingly becoming more fascinating, is macroscopic toroidization (density of toroidal dipoles), which is a direct consequence of retardation. In fact, dissimilar to the classical family of electric and magnetic multipoles, which are outcomes of the Taylor expansion of the electromagnetic potentials and sources, toroidal dipoles are obtained by the decomposition of the moment tensors. This review aims to discuss the fundamental and practical aspects of the toroidal multipolar moments in electrodynamics, from its emergence in the expansion set and the electromagnetic field associated with it, the unique characteristics of their interaction with external radiations and other moments, to the recent attempts to realize pronounced toroidal resonances in smart configurations of meta-molecules. Toroidal moments not only exhibit unique features in theory but also have promising technologically relevant applications, such as data storage, electromagnetic-induced transparency, unique magnetic responses and dichroism.

show abstract

A planar triangular Dy₃ + Dy₃ single-molecule magnet with a toroidal magnetic moment

Abstract: A unique Dy6 complex with a planar Dy3 + Dy3 structure was assembled by delicately modifying the axial ligands. Single-molecule magnet behavior and meanwhile a toroidal magnetic moment in the ground state have been observed.

Cited by 127 publications

References 41 publications

Homometallic Dy^III Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism

Homometallic Dy^III Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism

Supramolecular Approach for Enhancing Single‐Molecule Magnet Properties of Terbium(III)‐Phthalocyaninato Double‐Decker Complexes with Crown Moieties

Theory and applications of toroidal moments in electrodynamics: their emergence, characteristics, and technological relevance

Contact Info

Product

Resources

About

A planar triangular Dy3 + Dy3 single-molecule magnet with a toroidal magnetic moment

Abstract: A unique Dy6 complex with a planar Dy3 + Dy3 structure was assembled by delicately modifying the axial ligands. Single-molecule magnet behavior and meanwhile a toroidal magnetic moment in the ground state have been observed.

Cited by 127 publications

References 41 publications

Homometallic DyIII Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism

Homometallic DyIII Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism

Supramolecular Approach for Enhancing Single‐Molecule Magnet Properties of Terbium(III)‐Phthalocyaninato Double‐Decker Complexes with Crown Moieties

Theory and applications of toroidal moments in electrodynamics: their emergence, characteristics, and technological relevance

Contact Info

Product

Resources

About

A planar triangular Dy₃ + Dy₃ single-molecule magnet with a toroidal magnetic moment

Homometallic Dy^III Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism

Homometallic Dy^III Complexes of Varying Nuclearity from 2 to 21: Synthesis, Structure, and Magnetism