A single-molecule magnet assembly exhibiting a dielectric transition at 470 K

Wang, Yu-Xia; Shi, Wei; Han, Li; Song, You; Fang, Liang; Lan, Yanhua; Powell, Annie K.; Wernsdorfer, Wolfgang; Ungur, Liviu; Chibotaru, Liviu F.; Shen, Mingrong; Cheng, Peng

doi:10.1039/c2sc21023a

Cited by 175 publications

(77 citation statements)

References 25 publications

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“…In 2012, W. Shi and coworkers presented a novel triangular Dy 3 compound different from the above classical Dy 3 triangle through applying an amino-polyalcohol ligand with four −OH arms [18]. Here, the three Dy III ions are doubly bridged by two μ 3 -O atoms from deprotonated −OH arms of the ligands, leading to a Dy 3 triangle.…”

Section: New Dy 3 -Smts Systemsmentioning

confidence: 98%

Single-Molecule Toroics and Multinuclear Lanthanide Single-Molecule Magnets

Tang

Zhang

2015

Lanthanide Single Molecule Magnets

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In this chapter, we first give a clear definition for single-molecule toroic (SMT) on the basis of the toroidal magnetic moments of ground doublets present in triangular Dy 3 SMMs, which is further exemplified via several typical Dy-based single-molecular magnets (SMMs) showing toroidal magnetic moments. Secondly, we examine the typical polynuclear lanthanide complexes showing SMM behavior, and three main synthetic strategies are given as follows: building block approach, organometallic approach, and multidentate ligand approach. The information extracted from such investigation is expected to enhance our understanding to SMM performances of polynuclear lanthanide complexes and facilitate their future applications.Keywords Single-molecule toroic · Toroidal magnetic moments · Building block · Organometallic approach · Multidentate ligand As mentioned in last two chapters, although the mono-and dinuclear lanthanide complexes have exhibited great achievements in obtaining strongly blocked SMMs due to the strong magnetic anisotropy of lanthanide ions, the limited spin centers in the complexes appear still to prevent the further enhancement of their singlemolecular magnet (SMM) properties due to the limited number of unpaired electrons [1]. Theoretically speaking, the more the spin centers in one metal cluster, the larger spin ground state can be achieved when the ferromagnetic coupling interactions are present in the cluster. Nevertheless, it needs an accurate control for the magnetic anisotropy of each metal center and the magnetic exchange interactions between the metal ions, which seems to be a very challenging task. In particular, it turns to be more difficult for multinuclear lanthanide complexes because the core 4f orbital shielded by the external electrons usually leads to extremely strong magnetic anisotropy of lanthanide ions but poor communication with other metal ions. However, considerable effort of researchers has been devoted to this field, and some groundbreaking results were achieved in this respect. Importantly, the

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Section: New Dy 3 -Smts Systemsmentioning

confidence: 98%

Single-Molecule Toroics and Multinuclear Lanthanide Single-Molecule Magnets

Tang

Zhang

2015

Lanthanide Single Molecule Magnets

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“…In order to further miniaturize the molecular devices, using one or a few magnetic molecules such as SMMs to generate materials which also show ferroelectric properties is believed to be particularly attractive. Very recently, a multi-functional trianglar Dy 3+ compound, (22), was reported by Cheng and co-workers [55]. The compound crystallized in an acentric space group Pna2 1 , belonging to one of the 10 polar point groups.…”

Section: (Iii) Single-molecule Magnets Composed Of Only 4f Ionsmentioning

confidence: 99%

Evolvement of molecular nanomagnets in China

Wang

Sun

et al. 2013

Phil. Trans. R. Soc. A.

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Molecular nanomagnets have been undergoing development for 20 years since the first single-molecule magnet (SMM), Mn 12 Ac, was characterized as the molecule-behaved magnet. The multi-disciplinary scientists promoted the magnetic characteristics to be more suitable for use in information science and spintronics. The concept of molecular nanomagnets has also evolved to include single-chain magnets (SCMs), single-ion magnets (SIMs) and even magnetic molecules that showed only slow magnetic relaxation, in addition to the initial cluster-type SMMs. In this review, several aspects, including SMMs, SCMs and SIMs, are introduced briefly through some representative examples. In particular, the contribution of Chinese chemists is highlighted in the design, synthesis and understanding of various types of molecular nanomagnets.

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“…In species containing paramagnetic centers with unquenched orbital angular momentum and therefore with strong spin‐orbit coupling, magnetic interactions (exchange and dipolar) are highly anisotropic. To build an appropriate model (effective Hamiltonian) that governs such interactions and to determine its parameters, a complete active space multiconfigurational self‐consistent field spin‐orbit (CASSCF‐SO) treatment of magnetic anisotropy effects on each individual site is required, along with inelastic neutron scattering, EPR, and far‐IR measurements . Intramolecular magnetic interactions, irrespective of their strength, have a significant impact on magnetic properties of lanthanide‐ or actinide‐based SMMs by providing alternate relaxation pathways.…”

Section: Introductionmentioning

confidence: 99%

“…It is well‐known that magnetic exchange interaction between metal sites in a given‐type dimeric unit (which is defined as containing a certain type and a certain number of bridging moieties) depends strongly on its geometry. Various one‐ and multiparameter magnetostructural correlations (MSCs) relating key structural parameters, such as M–L br bond lengths and M–L br –M bond angles, with the isotropic magnetic exchange parameter J have been reported for binuclear and polynuclear complexes (see References and therein). These MSCs have proven satisfyingly successful in explaining the experimentally observed ground states and in predicting qualitatively the J values for a given series of compounds.…”

Section: Introductionmentioning

confidence: 99%

Insight into the influence of terminal ligands on magnetic exchange coupling in a series of dimeric copper(II) acetate adducts

Zueva

Petrova

Shamsieva

et al. 2019

Int J of Quantum Chemistry

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A combination of experimental (SQUID magnetometry) and quantum‐chemical (BS‐DFT, CASSCF(n,m)/NEVPT2, DDCI3) methods is used to probe the influence of terminal ligands on magnetic exchange coupling in the series of [Cu2(μ2‐OAc)4L2] complexes with O‐donor terminal ligands extended by two novel complexes containing phosphine oxide ligands. The possibilities and limitations of these approaches are discussed. The influence of terminal ligands on magnetic superexchange interaction was quantified by two contributions—the first contribution is associated with structural changes within the {Cu(μ2‐OAc)4Cu} core, while the second contribution is due to the difference in the electronic influence of different terminal ligands at a given core geometry. Both contributions were found to be approximately of the same order of magnitude. These results indicate that magnetic exchange coupling, known to be highly sensitive to the distortions in core geometry, is not solely determined by the core structure. Our findings are consistent with the fact that various one‐ and multiparameter magnetostructural correlations reported in the literature have only a qualitative predictive capability.

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A single-molecule magnet assembly exhibiting a dielectric transition at 470 K

Cited by 175 publications

References 25 publications

Single-Molecule Toroics and Multinuclear Lanthanide Single-Molecule Magnets

Single-Molecule Toroics and Multinuclear Lanthanide Single-Molecule Magnets

Evolvement of molecular nanomagnets in China

Insight into the influence of terminal ligands on magnetic exchange coupling in a series of dimeric copper(II) acetate adducts

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