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Magnetochemistry
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Feature Papers in Magnetochemistry
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Feature Papers in Magnetochemistry

A special issue of Magnetochemistry (ISSN 2312-7481).

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 39427

Special Issue Editor

Prof. Dr. Carlos J. Gómez García

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Guest Editor
Department of Inorganic Chemistry, Faculty of Chemistry, University of Valencia, C/Dr. Moliner 50, 46100 Burjasot, Valencia, Spain
Interests: molecular magnetism; coordination magnetic polymers; magnetic MOFs; magnetic polyoxometalates; conducting magnetic materials; multifunctional magnetic materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

To commemorate our 5th anniversary , we have taken the initiative to launch a Special Issue called "Feature Papers in Magnetochemistry". We would like to invite you to contribute an original research paper or a comprehensive review article (without any article publishing charge) on any subject they consider may be of interest for the Magnetochemistry community, including those already covered by any of our Special Issues.

Magnetochemistry has been accepted for inclusion in the Science Citation Index Expanded (SCIE) in the Web of Science since November 2019. We are going to receive our first Impact Factor in the June 2020 release of the Journal Citation Reports!

Prof. Dr. Carlos J. Gómez García
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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 quarterly 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 1000 CHF (Swiss Francs). However, the articles submitted in this special issue will be processed and published free of charge. 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

  • molecule-based magnets
  • magnetic MOFs
  • single molecule magnets
  • single ion magnets
  • spin crossover
  • quantum computing
  • magnetic nanoparticles
  • electron paramagnetic resonance
  • permanent magnets
  • magnetic resonance

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Published Papers (12 papers)

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Editorial

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4 pages, 397 KiB  
Editorial
Feature Papers in Magnetochemistry
by Carlos J. Gómez-García
Magnetochemistry 2021, 7(4), 48; https://doi.org/10.3390/magnetochemistry7040048 - 2 Apr 2021
Viewed by 1824
Abstract
When we launched the journal Magnetochemistry in 2015 we could not imagine such an enthusiastic response from the scientific community [...] Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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Research

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10 pages, 1749 KiB  
Article
The Magnetic Band-Structures of Ordered PtxFe1−x, PtxCo1−x, and PtxNi1−x (x = 0.25, 0.50, and 0.75)
by Ian Shuttleworth
Magnetochemistry 2020, 6(4), 61; https://doi.org/10.3390/magnetochemistry6040061 - 13 Nov 2020
Cited by 12 | Viewed by 2513
Abstract
The electronic band structures of the ordered L12 and L10 phases of the PtxM1−x (M = Fe, Co and Ni) alloys were investigated using spin-polarized density functional theory (DFT). The relative contributions of both itinerant (Stoner) and localized [...] Read more.
The electronic band structures of the ordered L12 and L10 phases of the PtxM1−x (M = Fe, Co and Ni) alloys were investigated using spin-polarized density functional theory (DFT). The relative contributions of both itinerant (Stoner) and localized magnetism at the high-symmetry k-points were determined and discussed qualitatively. Significant directional effects were identified along the A and R directions of the L10 and L12 alloys, respectively, and are discussed in terms of charge channeling effects. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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12 pages, 16302 KiB  
Article
Finite Length Effects on Switching Mechanisms in Chains of Magnetic Particles
by Dominika Kuźma and Piotr Zieliński
Magnetochemistry 2020, 6(4), 47; https://doi.org/10.3390/magnetochemistry6040047 - 1 Oct 2020
Cited by 4 | Viewed by 2725
Abstract
Periodic systems of magnetic nanoparticles are now of interest as they support GHz spin waves. Their equilibrium configurations, switchable with the external magnetic field, are crucial for such applications. We study infinite and finite chains of particles of two shapes (i) ellipsoidal and [...] Read more.
Periodic systems of magnetic nanoparticles are now of interest as they support GHz spin waves. Their equilibrium configurations, switchable with the external magnetic field, are crucial for such applications. We study infinite and finite chains of particles of two shapes (i) ellipsoidal and (ii) rectangular stripes with long axes perpendicular to the chain axis. A variable magnetic field is applied parallel to the long axes. Micromagnetic simulations are compared with the corresponding discrete spin models (Stoner-Wohlfarth model, S-W). An antiferromagnetic configuration is the ground state for all the systems at vanishing field but a ferromagnetic configuration occurs when the field is strong enough. The switching of the infinite chains to the reversed ferromagnetic configuration proceeds directly for the ellipsoids and by an intermediate configuration, in which the magnetization within the particle is non-uniform, in the case of the stripes. The non-uniform configurations are well represented by tilted states in S-W model. Important differences are found in the finite analogs: the switching of ellipsoids becomes multistage and starts from the innermost particles relatively well reproduced with S-W model, whereas the reversal of the stripes, starts from the outermost particles and has no analog in S-W model. Practical consequences of the findings are discussed. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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11 pages, 2610 KiB  
Article
Can the Double Exchange Cause Antiferromagnetic Spin Alignment?
by Andrew Palii, Juan M. Clemente-Juan, Sergey Aldoshin, Denis Korchagin, Evgenii Golosov, Shmuel Zilberg and Boris Tsukerblat
Magnetochemistry 2020, 6(3), 36; https://doi.org/10.3390/magnetochemistry6030036 - 28 Aug 2020
Cited by 7 | Viewed by 2976
Abstract
The effect of the double exchange in a square-planar mixed-valence dn+1−dn+1−dn−dn–type tetramers comprising two excess electrons delocalized over four spin cores is discussed. The detailed analysis of a [...] Read more.
The effect of the double exchange in a square-planar mixed-valence dn+1−dn+1−dn−dn–type tetramers comprising two excess electrons delocalized over four spin cores is discussed. The detailed analysis of a relatively simple d2−d2−d1−d1–type tetramer shows that in system with the delocalized electronic pair the double exchange is able to produce antiferromagnetic spin alignment. This is drastically different from the customary ferromagnetic effect of the double exchange which is well established for mixed-valence dimers and tetramers with one excess electron or hole. That is why the question “Can double exchange cause antiferromagnetic spin alignment?” became the title of this article. As an answer to this question the qualitative and quantitative study revealed that due to antiparallel directions of spins of the two mobile electrons which give competitive contributions to the overall polarization of spin cores, the system entirely becomes antiferromagnetic. It has been also shown that depending on the relative strength of the second-order double exchange and Heisenberg–Dirac–Van Vleck exchange the system has either the ground localized spin-triplet or the ground delocalized spin-singlet. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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9 pages, 3118 KiB  
Article
Anomalous Pressure Effects on the Electrical Conductivity of the Spin Crossover Complex [Fe(pyrazine){Au(CN)2}2]
by Andrei-Cristian Gheorghe, Yurii S. Bibik, Olesia I. Kucheriv, Diana D. Barakhtii, Marin-Vlad Boicu, Ionela Rusu, Andrei Diaconu, Il’ya A. Gural’skiy, Gábor Molnár and Aurelian Rotaru
Magnetochemistry 2020, 6(3), 31; https://doi.org/10.3390/magnetochemistry6030031 - 31 Jul 2020
Cited by 5 | Viewed by 3260
Abstract
We studied the spin-state dependence of the electrical conductivity of two nanocrystalline powder samples of the spin crossover complex [Fe(pyrazine){Au(CN)2}2]. By applying an external pressure (up to 3 kbar), we were able to tune the charge transport properties of [...] Read more.
We studied the spin-state dependence of the electrical conductivity of two nanocrystalline powder samples of the spin crossover complex [Fe(pyrazine){Au(CN)2}2]. By applying an external pressure (up to 3 kbar), we were able to tune the charge transport properties of the material from a more conductive low spin state to a crossover point toward a more conductive high spin state. We rationalize these results by taking into account the spin-state dependence of the activation parameters of the conductivity. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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17 pages, 3357 KiB  
Article
Spin Cross-Over (SCO) Anionic Fe(II) Complexes Based on the Tripodal Ligand Tris(2-pyridyl)ethoxymethane
by Emmelyne Cuza, Samia Benmansour, Nathalie Cosquer, Françoise Conan, Sébastien Pillet, Carlos J. Gómez-García and Smail Triki
Magnetochemistry 2020, 6(2), 26; https://doi.org/10.3390/magnetochemistry6020026 - 7 Jun 2020
Cited by 14 | Viewed by 3846
Abstract
Reactions of Fe(II) with the tripodal chelating ligand 1,1,1-tris(2-pyridyl)ethoxymethane (py3C-OEt) and (NCE)− co-ligands (E = S, Se, BH3) give a series of mononuclear complexes formulated as [Fe(py3C-OEt)2][Fe(py3C-OEt)(NCE)3]2·2CH3 [...] Read more.
Reactions of Fe(II) with the tripodal chelating ligand 1,1,1-tris(2-pyridyl)ethoxymethane (py3C-OEt) and (NCE)− co-ligands (E = S, Se, BH3) give a series of mononuclear complexes formulated as [Fe(py3C-OEt)2][Fe(py3C-OEt)(NCE)3]2·2CH3CN, with E = S (1) and BH3 (2). These compounds are the first Fe(II) spin cross-over (SCO) complexes based on the tripodal ligand tris(2-pyridyl)ethoxymethane and on the versatile co-ligands (NCS)− and (NCBH3)−. The crystal structure reveals discrete monomeric isomorph structures formed by a cationic [Fe(py3C-OEt)2]2+ complex and by two equivalent anionic [Fe(py3C-OEt)(NCE)3]− complexes. In the cations the Fe(II) is facially coordinated by two py3C-OEt tripodal ligands whereas in the anion the three nitrogen atoms of the tripodal ligand are facially coordinated and the N-donor atoms of the three (NCE)− co-ligands occupy the remaining three positions to complete the distorted octahedral environment of the Fe(II) centre. The magnetic studies show the presence of gradual SCO for both complexes: A one-step transition around 205 K for 1 and a two-step transition for compound 2, centered around 245 K and 380 K. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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11 pages, 2486 KiB  
Article
Field-Induced Single-Ion Magnet Phenomenon in Hexabromo- and Hexaiodorhenate(IV) Complexes
by Carlos Rojas-Dotti, Adrián Sanchis-Perucho, Marta Orts-Arroyo, Nicolás Moliner, Ricardo González, Francesc Lloret and José Martínez-Lillo
Magnetochemistry 2020, 6(2), 20; https://doi.org/10.3390/magnetochemistry6020020 - 22 Apr 2020
Cited by 5 | Viewed by 3359
Abstract
Two mononuclear ReIV complexes of general formula (PPh4)2[ReX6] [PPh4+ = tetraphenylphosphonium cation, X = Br (1) and I (2)] have been prepared and structurally and magnetically characterised. Both compounds crystallise [...] Read more.
Two mononuclear ReIV complexes of general formula (PPh4)2[ReX6] [PPh4+ = tetraphenylphosphonium cation, X = Br (1) and I (2)] have been prepared and structurally and magnetically characterised. Both compounds crystallise in the triclinic system with space group Pī. Their structures are made up of hexahalorhenate(IV), [ReX6]2−, anions, and bulky PPh4+ cations. Each ReIV ion in 1 and 2 is six-coordinate and bonded to six halide ions in a quasi regular octahedral geometry. In their crystal packing, the [ReX6]2− anions are well separated from each other through the organic cations, generating alternated anionic and cationic layers, and no intermolecular Re−X···X−Re interactions are present. Variable-temperature dc magnetic susceptibility measurements performed on microcrystalline samples of 1 and 2 show a very similar magnetic behaviour, which is typical of noninteracting mononuclear ReIV complexes with S = 3/2. Ac magnetic susceptibility measurements reveal the slow relaxation of the magnetisation in the presence of external dc fields for 1 and 2, hence indicating the occurrence of the field-induced single-ion magnet (SIM) phenomenon in these hexabromo- and hexaiodorhenate(IV) complexes. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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14 pages, 3091 KiB  
Article
Dysprosium Single-Molecule Magnets Involving 1,10-Phenantroline-5,6-dione Ligand
by Olivier Galangau, Jessica Flores Gonzalez, Vincent Montigaud, Vincent Dorcet, Boris le Guennic, Olivier Cador and Fabrice Pointillart
Magnetochemistry 2020, 6(2), 19; https://doi.org/10.3390/magnetochemistry6020019 - 15 Apr 2020
Cited by 9 | Viewed by 3537
Abstract
The two mononuclear complexes of the formula [Dy(tta)3(L)] (1) and [Dy(hfac)3(L)] (2) (where tta- = 2-thenoytrifluoroacetylacetonate and hfac- = 1,1,1,5,5,5-hexafluoroacetylacetonate) were obtained from the coordination reaction of the Dy(tta) [...] Read more.
The two mononuclear complexes of the formula [Dy(tta)3(L)] (1) and [Dy(hfac)3(L)] (2) (where tta- = 2-thenoytrifluoroacetylacetonate and hfac- = 1,1,1,5,5,5-hexafluoroacetylacetonate) were obtained from the coordination reaction of the Dy(tta)3·2H2O or Dy(hfac)3·2H2O units with the 1,10-phenantroline-5,6-dione ligand (L). Their structures have been determined by X-ray diffraction studies on single crystals, and they revealed a supramolecular assembly of tetramers through σ-π interactions. Both complexes displayed a Single-Molecule Magnet (SMM) behavior without an external applied magnetic field. Magnetic relaxation happened through Orbach, Raman and Quantum Tunneling of the Magnetization (QTM). Wavefunction theory calculations were realized to rationalize the magnetic properties. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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8 pages, 1823 KiB  
Article
Spontaneous Magnetization and Optical Activity in the Chiral Series {(L-proline)nV[Cr(CN)6]x} (0 < n < 3)
by Bárbara Rodríguez-García and Jose Ramon Galan-Mascaros
Magnetochemistry 2020, 6(1), 12; https://doi.org/10.3390/magnetochemistry6010012 - 3 Mar 2020
Cited by 3 | Viewed by 3229
Abstract
The incorporation of the natural amino acid L-proline in the synthesis to vanadium-chromium Prussian blue derivatives results in materials exhibiting magnetic ordering including chiral magnetic centers. Although the amorphous nature of these materials makes difficult to assess the structural features of these proline-containing [...] Read more.
The incorporation of the natural amino acid L-proline in the synthesis to vanadium-chromium Prussian blue derivatives results in materials exhibiting magnetic ordering including chiral magnetic centers. Although the amorphous nature of these materials makes difficult to assess the structural features of these proline-containing compounds, magnetic and spectroscopic data confirms their multifunctionality. They exhibit high-temperature magnetic ordering (Tc < 255 K) and a circular dichroic signal, representing the molecule-based chiral magnets with the highest ordering temperatures reported to date. In addition, the presence of chiral L-proline (or D-proline) has additional benefits, including higher redox stability and the appearance of magnetic hysteresis. The latter was not observed in the parent compounds, the series of room temperature molecule-based magnets V[Cr(CN)6]x. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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16 pages, 4576 KiB  
Article
A Series of Field-Induced Single-Ion Magnets Based on the Seven-Coordinate Co(II) Complexes with the Pentadentate (N3O2) H2dapsc Ligand
by Vyacheslav A. Kopotkov, Denis V. Korchagin, Valentina D. Sasnovskaya, Ildar F. Gilmutdinov and Eduard B. Yagubskii
Magnetochemistry 2019, 5(4), 58; https://doi.org/10.3390/magnetochemistry5040058 - 18 Oct 2019
Cited by 13 | Viewed by 4456
Abstract
A series of five new mononuclear pentagonal bipyramidal Co(II) complexes with the equatorial 2,6-diacetylpyridine bis(semicarbazone) ligand (H2dapsc) and various axial pseudohalide ligands (SCN, SeCN, N(CN)2, C(CN)3, and N3) was prepared and structurally characterizated: [Co(H2 [...] Read more.
A series of five new mononuclear pentagonal bipyramidal Co(II) complexes with the equatorial 2,6-diacetylpyridine bis(semicarbazone) ligand (H2dapsc) and various axial pseudohalide ligands (SCN, SeCN, N(CN)2, C(CN)3, and N3) was prepared and structurally characterizated: [Co(H2dapsc)(SCN)2]∙0.5C2H5OH (1), [Co(H2dapsc)(SeCN)2]∙0.5C2H5OH (2), [Co(H2dapsc)(N(CN)2)2]∙2H2O (3), [Co(H2dapsc)(C(CN)3)(H2O)](NO3)∙1.16H2O (4), and {[Co(H2dapsc)(H2O)(N3)][Co(H2dapsc)(N3)2]}N3∙4H2O (5). The combined analyses of the experimental DC and AC magnetic data of the complexes (1–5) and two other earlier described those of this family [Co(H2dapsc)(H2O)2)](NO3)2∙2H2O (6) and [Co(H2dapsc)(Cl)(H2O)]Cl∙2H2O (7), their theoretical description and the ab initio CASSCF/NEVPT2 calculations reveal large easy-plane magnetic anisotropies for all complexes (D = + 35 − 40 cm−1). All complexes under consideration demonstrate slow magnetic relaxation with dominant Raman and direct spin–phonon processes at static magnetic field and so they belong to the class of field-induced single-ion magnets (SIMs). Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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Review

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51 pages, 10665 KiB  
Review
Lanthanoid-Anilato Complexes and Lattices
by Samia Benmansour and Carlos J. Gómez-García
Magnetochemistry 2020, 6(4), 71; https://doi.org/10.3390/magnetochemistry6040071 - 15 Dec 2020
Cited by 24 | Viewed by 3199
Abstract
In this review, we describe all the structurally characterized complexes containing lanthanoids (Ln, including La and group 3 metals: Y and Lu) and any anilato-type ligand (3,6-disubstituted-2,5-dihydroxy-1,4-benzoquinone dianion = C6O4X22−). We present all the anilato-Ln compounds [...] Read more.
In this review, we describe all the structurally characterized complexes containing lanthanoids (Ln, including La and group 3 metals: Y and Lu) and any anilato-type ligand (3,6-disubstituted-2,5-dihydroxy-1,4-benzoquinone dianion = C6O4X22−). We present all the anilato-Ln compounds including those where, besides the anilato-type ligand, there is one or more coligands or solvent molecules coordinated to the lanthanoid ions. We show the different structural types observed in these compounds: from discrete monomers, dimers and tetramers to extended 1D, 2D and 3D lattices with different topologies. We also revise the magnetic properties of these Ln-anilato compounds, including single-molecule magnet (SMM) and single-ion magnet (SIM) behaviours. Finally, we show the luminescent and electrochemical properties of some of them, their gas/solvent adsorption/absorption and exchange capacity and the attempts to prepare them as thin films. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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Other

14 pages, 27028 KiB  
Perspective
Designing Magnetic NanoMOFs for Biomedicine: Current Trends and Applications
by Mariangela Oggianu, Noemi Monni, Valentina Mameli, Carla Cannas, Suchithra Ashoka Sahadevan and Maria Laura Mercuri
Magnetochemistry 2020, 6(3), 39; https://doi.org/10.3390/magnetochemistry6030039 - 1 Sep 2020
Cited by 15 | Viewed by 3562
Abstract
Metal–organic frameworks (MOFs) have shown a great potential in biomedicine due to their promising applications in different fields, including drug delivery, thermometry, theranostics etc. In this context, the development of magnetic sub-micrometric or nanometric MOFs through miniaturization approaches of magnetic MOFs up to [...] Read more.
Metal–organic frameworks (MOFs) have shown a great potential in biomedicine due to their promising applications in different fields, including drug delivery, thermometry, theranostics etc. In this context, the development of magnetic sub-micrometric or nanometric MOFs through miniaturization approaches of magnetic MOFs up to the nanoscale still represents a crucial step to fabricate biomedical probes, especially in the field of theranostic nanomedicine. Miniaturization processes have to be properly designed to tailor the size and shape of particles and to retain magnetic properties and high porosity in the same material, fundamental prerequisites to develop smart nanocarriers integrating simultaneously therapeutic and contrast agents for targeted chemotherapy or other specific clinical use. An overview of current trends on the design of magnetic nanoMOFs in the field of biomedicine, with particular emphasis on theranostics and bioimaging, is herein envisioned. Full article
(This article belongs to the Special Issue Feature Papers in Magnetochemistry)
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