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Magnetochemistry
Special Issues
Molecular Magnetism of Lanthanides Complexes and Networks
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Molecular Magnetism of Lanthanides Complexes and Networks

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: closed (15 June 2017) | Viewed by 50295

Printed Edition Available!
A printed edition of this Special Issue is available here.

Special Issue Editor

Dr. Kevin Bernot

E-Mail Website
Guest Editor
Institut des Sciences Chimiques de Rennes (ISCR), INSA-Rennes, 20 av. des buttes de Coësmes, 35708 Rennes, France
Interests: lanthanides; coordination chemistry; molecular magnetism; luminescence; single-molecule magnets; single-chain magnets; radical ligands; metal-organic frameworks; multifunctional materials; surfaces

Special Issue Information

Dear Colleagues,

In 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. Their strong magnetic moment and huge magnetic anisotropy are strong assets that have enabled breakthroughs in magnetic blocking temperature and related phenomena. The chemical versatility of these ions is also a crucial benefit, as easy substitution among the lanthanides series can either afford isotropic, anisotropic or solid-solutions of magnetic molecules. In a similar way, their well-known luminescent properties have been identified as key features to rationalize SMMs behavior and theoretical approaches have made a great deal of progress.

Moreover, aside from their use as building blocks for high performance SMMs, lanthanides ions permitted the design of unique magnetic compounds that found numerous other applications that ranges from molecular magnetic coolers to spintronics devices, qubits and more generally multifunctional materials.

This Special Issue of Magnetochemistry is a key forum to publish your latest research in lanthanide-based compounds, and, more specifically, in the fields listed below.

Dr. Kevin Bernot
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Magnetochemistry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Lanthanide-based magnetic molecules (SMMs, SCMs, extended networks and MOFs, organometallics, polyoxometalates, hetero-spin systems,...)
  • Lanthanide-based spintronics and qubits
  • Lanthanide-based magnetic coolers
  • Lanthanide-based magnetic molecules on surfaces
  • Lanthanide-based multifunctional magnetic materials
  • Computational approaches of Lanthanide-based molecules
  • Characterization techniques of Lanthanide-based magnetic materials

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Published Papers (8 papers)

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Editorial

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166 KiB  
Editorial
Molecular Magnetism of Lanthanides Complexes and Networks
by Kevin Bernot
Magnetochemistry 2017, 3(3), 26; https://doi.org/10.3390/magnetochemistry3030026 - 2 Aug 2017
Cited by 1 | Viewed by 3364
Abstract
Lanthanides ions allows for the design of remarkable magnetic compounds with unique magnetic properties.[...] Full article
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)

Research

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3243 KiB  
Article
Using the Singly Deprotonated Triethanolamine to Prepare Dinuclear Lanthanide(III) Complexes: Synthesis, Structural Characterization and Magnetic Studies
by Ioannis Mylonas-Margaritis, Julia Mayans, Stavroula-Melina Sakellakou, Catherine P. Raptopoulou, Vassilis Psycharis, Albert Escuer and Spyros P. Perlepes
Magnetochemistry 2017, 3(1), 5; https://doi.org/10.3390/magnetochemistry3010005 - 26 Jan 2017
Cited by 19 | Viewed by 6188
Abstract
The 1:1 reactions between hydrated lanthanide(III) nitrates and triethanolamine (teaH3) in MeOH, in the absence of external bases, have provided access to the dinuclear complexes [Ln2(NO3)4(teaH2)2] (Ln = Pr, 1; [...] Read more.
The 1:1 reactions between hydrated lanthanide(III) nitrates and triethanolamine (teaH3) in MeOH, in the absence of external bases, have provided access to the dinuclear complexes [Ln2(NO3)4(teaH2)2] (Ln = Pr, 1; Ln = Gd, 2; Ln = Tb, 3; Ln = Dy, 4; Ln = Ho, 5) containing the singly deprotonated form of the ligand. Use of excess of the ligand in the same solvent gives mononuclear complexes containing the neutral ligand and the representative compound [Pr(NO3)(teaH3)2](NO3)2 (6) was characterized. The structures of the isomorphous complexes 1∙2MeOH, 2∙2MeOH and 4∙2MeOH were solved by single-crystal X-ray crystallography; the other two dinuclear complexes are proposed to be isostructural with 1, 2 and 4 based on elemental analyses, IR spectra and powder XRD patterns. The IR spectra of 1–6 are discussed in terms of structural features of the complexes. The two LnIII atoms in centrosymmetric 1∙2MeOH, 2∙2MeOH and 4∙2MeOH are doubly bridged by the deprotonated oxygen atoms of the two η1:η1:η1:η2:μ2 teaH2− ligands. The teaH2− nitrogen atom and six terminal oxygen atoms (two from the neutral hydroxyl groups of teaH2− and four from two slightly anisobidentate chelating nitrato groups) complete 9-coordination at each 4f-metal center. The coordination geometries of the metal ions are spherical-relaxed capped cubic (1∙2MeOH), Johnson tricapped trigonal prismatic (2∙2MeOH) and spherical capped square antiprismatic (4·2MeOH). O–H∙∙∙O H bonds create chains parallel to the a axis. The cation of 6 has crystallographic two fold symmetry and the rotation axis passes through the PrIII atom, the nitrogen atom of the coordinated nitrato group and the non-coordinated oxygen atom of the nitrato ligand. The metal ion is bound to the two η1:η1:η1:η1 teaH3 ligands and to one bidentate chelating nitrato group. The 10-coordinate PrIII atom has a sphenocoronal coordination geometry. Several H bonds are responsible for the formation of a 3D architecture in the crystal structure of 6. Complexes 1–6 are new members of a small family of homometallic LnIII complexes containing various forms of triethanolamine as ligands. Dc magnetic susceptibility studies in the 2–300 K range reveal the presence of a weak to moderate intramolecular antiferromagnetic exchange interaction (J = −0.30(2) cm−1 based on the spin Hamiltonian H ^ = - J ( S ^ Gd 1 ⋅ S ^ Gd 1 ′ ) ) for 2 and probably weak antiferromagnetic exchange interactions within the molecules of 3–5. The antiferromagnetic GdIII∙∙∙GdIII interaction in 2 is discussed in terms of known magnetostructural correlations for complexes possessing the {Gd2(μ2-OR)2}4+ core. Ac magnetic susceptibility measurements in zero dc field for 3–5 do not show frequency dependent out-of-phase signals; this experimental fact is discussed and rationalized for complex 4 in terms of the magnetic anisotropy axis for each DyIII center and the oblate electron density of the metal ion. Full article
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)
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4041 KiB  
Article
Slow Magnetic Relaxation in Chiral Helicene-Based Coordination Complex of Dysprosium
by Guglielmo Fernandez-Garcia, Jessica Flores Gonzalez, Jiang-Kun Ou-Yang, Nidal Saleh, Fabrice Pointillart, Olivier Cador, Thierry Guizouarn, Federico Totti, Lahcène Ouahab, Jeanne Crassous and Boris Le Guennic
Magnetochemistry 2017, 3(1), 2; https://doi.org/10.3390/magnetochemistry3010002 - 23 Dec 2016
Cited by 17 | Viewed by 6634
Abstract
The complex [Dy(L)(tta)3] with L the chiral 3-(2-pyridyl)-4-aza[6]-helicene ligand (tta− = 2-thenoyltrifluoroaacetonate) has been synthesized in its racemic form and structurally and magnetically characterized. [Dy(L)(tta)3] behaves as a single molecule magnet in its crystalline [...] Read more.
The complex [Dy(L)(tta)3] with L the chiral 3-(2-pyridyl)-4-aza[6]-helicene ligand (tta− = 2-thenoyltrifluoroaacetonate) has been synthesized in its racemic form and structurally and magnetically characterized. [Dy(L)(tta)3] behaves as a single molecule magnet in its crystalline phase with the opening of a hysteresis loop at 0.50 K. These magnetic properties were interpreted with ab initio calculations. Full article
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)
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6528 KiB  
Article
Elaboration of Luminescent and Magnetic Hybrid Networks Based on Lanthanide Ions and Imidazolium Dicarboxylate Salts: Influence of the Synthesis Conditions
by Pierre Farger, Cédric Leuvrey, Mathieu Gallart, Pierre Gilliot, Guillaume Rogez, Pierre Rabu and Emilie Delahaye
Magnetochemistry 2017, 3(1), 1; https://doi.org/10.3390/magnetochemistry3010001 - 22 Dec 2016
Cited by 7 | Viewed by 5034
Abstract
The syntheses and characterization of four new hybrid coordination networks based on lanthanide ions (Ln = Nd, Sm) and 1,3-carboxymethylimidazolium (L) salt in the presence of oxalic acid (H2ox) are reported. The influence of the synthesis parameters, such as [...] Read more.
The syntheses and characterization of four new hybrid coordination networks based on lanthanide ions (Ln = Nd, Sm) and 1,3-carboxymethylimidazolium (L) salt in the presence of oxalic acid (H2ox) are reported. The influence of the synthesis parameters, such as the nature of the lanthanide ion (Nd3+ or Sm3+), the nature of the imidazolium source (chloride [H2L][Cl] or zwitterionic [HL] form) and the presence or not of oxalic acid (H2ox), is discussed. In the presence of oxalic acid, the samarium salt gives only one compound [Sm(L)(ox)(H2O)]·H2O, whatever the nature of the imidazolium ligand, while the neodymium salt leads to three different compounds, [Nd(L)(ox)(H2O)]·H2O, [Nd(L)(ox)0.5(H2O)2][Cl] or [Nd2(L)2(ox)(NO3)(H2O)3][NO3], depending on the imidazolium ligand. In the absence of oxalic acid, gels are obtained, except for the reaction between the neodymium salt and [H2L][Cl], which leads to [Nd(L)(ox)(H2O)]·H2O. All compounds crystallized and their structures were determined by single crystal diffraction. The description of these new phases was consistently supported by ancillary techniques, such as powder X-ray diffraction, thermal analyses and UV-visible-near infrared spectroscopy. The luminescent and magnetic properties of the three pure compounds [Sm(L)(ox)(H2O)]·H2O, [Nd(L)(ox)(H2O)]·H2O and [Nd2(L)2(ox)(NO3)(H2O)3][NO3] were also studied. Full article
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)
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3940 KiB  
Article
Hybrid Molecular Compound Exhibiting Slow Magnetic Relaxation and Electrical Conductivity
by Yongbing Shen, Goulven Cosquer, Brian K. Breedlove and Masahiro Yamashita
Magnetochemistry 2016, 2(4), 44; https://doi.org/10.3390/magnetochemistry2040044 - 9 Dec 2016
Cited by 12 | Viewed by 5433
Abstract
Electrochemical oxidation of a solution containing KDy(hfac)4 (hfac, hexafluoroacetyacetone) and Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) afforded a hybrid material formulated as [β′-(BEDT-TTF)2Dy(CF3COO)4∙MeCN]n. The complex crystallizes in the triclinic space group P 1 ¯ . The before mentioned [...] Read more.
Electrochemical oxidation of a solution containing KDy(hfac)4 (hfac, hexafluoroacetyacetone) and Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) afforded a hybrid material formulated as [β′-(BEDT-TTF)2Dy(CF3COO)4∙MeCN]n. The complex crystallizes in the triclinic space group P 1 ¯ . The before mentioned complex has a chain structure containing 4f ions bridged by mono-anion CF3COO− ligand, and acts as single-molecule magnet (SMM) at low temperature. The conducting layer was composed of partially oxidized BEDT-TTF molecules in β′ type arrangement. The presence of radical cation and its charge ordering was assigned on the basis of optical spectra. Electrical resistivity measurements revealed semiconducting behaviour (conductivity at room temperature of 1.1 × 10−3 S·cm−1, activation energy of 158.5 meV) at ambient pressure. Full article
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)
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4016 KiB  
Article
Slow Magnetic Relaxation of Lanthanide(III) Complexes with a Helical Ligand
by Hisami Wada, Sayaka Ooka, Daichi Iwasawa, Miki Hasegawa and Takashi Kajiwara
Magnetochemistry 2016, 2(4), 43; https://doi.org/10.3390/magnetochemistry2040043 - 8 Dec 2016
Cited by 28 | Viewed by 7322
Abstract
Isostructural Ln(III) mononuclear complexes [Ln(NO3)2L]PF6·MeCN (Ln = Nd, Tb, or Dy; L denotes a helical hexa-dentate ligand) were synthesized, and their slow magnetic relaxation behavior was investigated. In these complexes, oblate-type Ln(III) ions are located in an [...] Read more.
Isostructural Ln(III) mononuclear complexes [Ln(NO3)2L]PF6·MeCN (Ln = Nd, Tb, or Dy; L denotes a helical hexa-dentate ligand) were synthesized, and their slow magnetic relaxation behavior was investigated. In these complexes, oblate-type Ln(III) ions are located in an axially stressed ligand field with two nitrate anions, and can exhibit single-molecule magnet (SMM) behavior. Field-induced SMM behavior was observed for Nd(III) and Dy(III) complexes under an applied bias DC field of 1000 Oe. Full article
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)
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Graphical abstract

2111 KiB  
Article
Magneto-Luminescence Correlation in the Textbook Dysprosium(III) Nitrate Single-Ion Magnet
by Ekaterina Mamontova, Jérôme Long, Rute A. S. Ferreira, Alexandre M. P. Botas, Dominique Luneau, Yannick Guari, Luis D. Carlos and Joulia Larionova
Magnetochemistry 2016, 2(4), 41; https://doi.org/10.3390/magnetochemistry2040041 - 18 Nov 2016
Cited by 39 | Viewed by 7620
Abstract
Multifunctional Single-Molecule Magnets (SMMs) or Single-Ion Magnets (SIMs) are intriguing molecule-based materials presenting an association of the slow magnetic relaxation with other physical properties. In this article, we present an example of a very simple molecule based on Dy3+ ion exhibiting a [...] Read more.
Multifunctional Single-Molecule Magnets (SMMs) or Single-Ion Magnets (SIMs) are intriguing molecule-based materials presenting an association of the slow magnetic relaxation with other physical properties. In this article, we present an example of a very simple molecule based on Dy3+ ion exhibiting a field induced SIM property and a characteristic Dy3+ based emission. The [Dy(NO3)3(H2O)4]·2H2O (1) complex is characterized by the means of single crystal X-Ray diffraction and their magnetic and photo-luminescent properties are investigated. We demonstrate here that it is possible to correlate the magnetic and luminescent properties and to obtain the Orbach barrier from the low temperature emission spectra, which is often difficult to properly extract from the magnetic measurements, especially in the case of field induced SIMs. Full article
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)
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Review

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6161 KiB  
Review
Perspectives on Neutron Scattering in Lanthanide-Based Single-Molecule Magnets and a Case Study of the Tb2(μ-N2) System
by Krunoslav Prša, Joscha Nehrkorn, Jordan F. Corbey, William J. Evans, Selvan Demir, Jeffrey R. Long, Tatiana Guidi and Oliver Waldmann
Magnetochemistry 2016, 2(4), 45; https://doi.org/10.3390/magnetochemistry2040045 - 14 Dec 2016
Cited by 23 | Viewed by 7510
Abstract
Single-molecule magnets (SMMs) based on lanthanide ions display the largest known blocking temperatures and are the best candidates for molecular magnetic devices. Understanding their physical properties is a paramount task for the further development of the field. In particular, for the poly-nuclear variety [...] Read more.
Single-molecule magnets (SMMs) based on lanthanide ions display the largest known blocking temperatures and are the best candidates for molecular magnetic devices. Understanding their physical properties is a paramount task for the further development of the field. In particular, for the poly-nuclear variety of lanthanide SMMs, a proper understanding of the magnetic exchange interaction is crucial. We discuss the strengths and weaknesses of the neutron scattering technique in the study of these materials and particularly for the determination of exchange. We illustrate these points by presenting the results of a comprehensive inelastic neutron scattering study aimed at a radical-bridged diterbium(III) cluster, Tb2(μ-N23−), which exhibits the largest blocking temperature for a poly-nuclear SMM. Results on the YIII analogue Y2(μ-N23−) and the parent compound Tb2(μ-N22−) (showing no SMM features) are also reported. The results on the parent compound include the first direct determination of the lanthanide-lanthanide exchange interaction in a molecular cluster based on inelastic neutron scattering. In the SMM compound, the resulting physical picture remains incomplete due to the difficulties inherent to the problem. Full article
(This article belongs to the Special Issue Molecular Magnetism of Lanthanides Complexes and Networks)
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