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Trapali A, Muppal M, Pandey S, Boillot ML, Repain V, Dappe YJ, Dayen JF, Rivière E, Guillot R, Arrio MA, Otero E, Bellec A, Mallah T. Investigation of the spin crossover behaviour of a sublimable Fe(II)-qsal complex: from the bulk to a submonolayer on graphene/SiO 2. Dalton Trans 2024; 53:12519-12526. [PMID: 39012501 DOI: 10.1039/d4dt01417k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/17/2024]
Abstract
We synthesized a sublimable molecular spin crossover Fe(II) complex based on the Schiff base tridentate ligand qsal-NEt2 (5-diethylamino-2-((quinolin-8-ylimino)methyl)phenol). The compound undergoes a transition in temperature with thermally induced excited spin state-trapping (TIESST) for high-temperature sweep rates, which can be suppressed by reducing the sweep rate. The X-ray absorption spectroscopy (XAS) studies on the microcrystalline powder confirm the TIESST effect. The molecules are deposited under ultra-high vacuum on a graphene/SiO2 substrate as a submonolayer. Investigation of the submonolayer by XAS reveals the molecular integrity and shows a spin crossover for the whole temperature range from 350 to 4 K, with residual HS species at low temperature and no TIESST effect. DFT calculations suggest a distribution of energetically similar adsorption configurations on graphene, i.e., with smooth crossover behaviour and the absence of TIESST, consistent with very weak intermolecular interactions and the absence of large molecular islands within the submonolayer.
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Affiliation(s)
- Adelais Trapali
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, UMR 8182, 91405 Orsay 12 Cedex, France.
| | - Mukil Muppal
- Université Paris Cit é, CNRS, Laboratoire Matériaux et Phénomènes Quantiques, F-75013, Paris, France
| | - Satakshi Pandey
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504, 23 rue du Loess, Strasbourg, 67034, France
| | - Marie-Laure Boillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, UMR 8182, 91405 Orsay 12 Cedex, France.
| | - Vincent Repain
- Université Paris Cit é, CNRS, Laboratoire Matériaux et Phénomènes Quantiques, F-75013, Paris, France
| | - Yannick J Dappe
- SPEC, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, Cedex, France
| | - Jean-François Dayen
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504, 23 rue du Loess, Strasbourg, 67034, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, UMR 8182, 91405 Orsay 12 Cedex, France.
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, UMR 8182, 91405 Orsay 12 Cedex, France.
| | - Marie-Anne Arrio
- Institutde Mineŕalogie, dePhysiquedes Mateŕiauxetde Cosmochimie, CNRS, Université Pierreet Marie Curie, UMR 7590, Paris, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, 91192 Gif sur Yvette, France
| | - Amandine Bellec
- Université Paris Cit é, CNRS, Laboratoire Matériaux et Phénomènes Quantiques, F-75013, Paris, France
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, UMR 8182, 91405 Orsay 12 Cedex, France.
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Curti L, Prado Y, Michel A, Talbot D, Baptiste B, Otero E, Ohresser P, Journaux Y, Cartier-Dit-Moulin C, Dupuis V, Fleury B, Sainctavit P, Arrio MA, Fresnais J, Lisnard L. Room-temperature-persistent magnetic interaction between coordination complexes and nanoparticles in maghemite-based nanohybrids. NANOSCALE 2024; 16:10607-10617. [PMID: 38758111 DOI: 10.1039/d4nr01220h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Maghemite nanoparticles functionalised with Co(II) coordination complexes at their surface show a significant increase of their magnetic anisotropy, leading to a doubling of the blocking temperature and a sixfold increase of the coercive field. Magnetometric studies suggest an enhancement that is not related to surface disordering, and point to a molecular effect involving magnetic exchange interactions mediated by the oxygen atoms at the interface as its source. Field- and temperature-dependent X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) studies show that the magnetic anisotropy enhancement is not limited to surface atoms and involves the core of the nanoparticle. These studies also point to a mechanism driven by anisotropic exchange and confirm the strength of the magnetic exchange interactions. The coupling between the complex and the nanoparticle persists at room temperature. Simulations based on the XMCD data give an effective exchange field value through the oxido coordination bridge between the Co(II) complex and the nanoparticle that is comparable to the exchange field between iron ions in bulk maghemite. Further evidence of the effectiveness of the oxido coordination bridge in mediating the magnetic interaction at the interface is given with the Ni(II) analog to the Co(II) surface-functionalised nanoparticles. A substrate-induced magnetic response is observed for the Ni(II) complexes, up to room temperature.
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Affiliation(s)
- Leonardo Curti
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | - Yoann Prado
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Aude Michel
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Delphine Talbot
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Benoît Baptiste
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Yves Journaux
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | | | - Vincent Dupuis
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Benoit Fleury
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | - Philippe Sainctavit
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Marie-Anne Arrio
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
| | - Jérôme Fresnais
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Laurent Lisnard
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
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Plyuta N, Barra AL, Novitchi G, Avarvari N. Six-coordinated nickel(II) complexes with benzothiadiazole Schiff-base ligands: synthesis, crystal structure, magnetic and HFEPR study. Dalton Trans 2024; 53:8835-8842. [PMID: 38716673 DOI: 10.1039/d4dt01143k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
Two new nickel(II) complexes, namely Ni(L1)2 (1) and Ni(L2)2·CH2Cl2(2) were obtained by reacting nickel(II) acetate tetrahydrate with the benzothiadiazole Schiff base ligands HL1 = 2-[4-(2,1,3-benzothiadiazole)imino]methyl-phenol or HL2 = 2-[(2,1,3-benzothiadiazol-4-ylimino)methyl]-6-methoxyphenol in the presence of Et3N. The tridentate NNO chelate ligands induce a distorted octahedral environment around the nickel(II) ions. Single crystal X-ray diffraction analysis reveals elongated Ni-N bonds with the nitrogen atom of the benzothiadiazole ring in both complexes. Intermolecular hydrogen bonds and π-π stacking interactions create two-dimensional and three-dimensional supramolecular arrays, respectively, for complexes 1 and 2. Magnetic susceptibility and high-field electron paramagnetic resonance measurements show the presence of significant magnetic anisotropy, with an axial distortion parameter D of -8--10 cm-1.
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Affiliation(s)
- Nataliya Plyuta
- Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, F-49000 Angers, France.
| | - Anne-Laure Barra
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Ghenadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, Université Grenoble-Alpes, B.P. 166, 38042 Grenoble Cedex 9, France
| | - Narcis Avarvari
- Univ Angers, CNRS, MOLTECH-Anjou, SFR MATRIX, F-49000 Angers, France.
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Jensen S, Løge IA, Bendix J, Diekhöner L. An approach for patterned molecular adsorption on ferromagnets, achieved via Moiré superstructures. Phys Chem Chem Phys 2024; 26:13710-13718. [PMID: 38669006 DOI: 10.1039/d4cp00809j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2024]
Abstract
We have used a scanning tunneling microscope operated under ultrahigh vacuum conditions to investigate an oxo-vanadium-salen complex V(O)salen, that has potential applications as qubits in future quantum-based technologies. The adsorption and self-assembly of V(O)salen on a range of single crystal metal surfaces and nanoislands and the influence of substrate morphology and reactivity has been measured. On the close-packed flat Ag(111) and Cu(111) surfaces, the molecules adsorb isolated or form small clusters arranged randomly on the surface, whereas structured adsorption occurs on two types of Co nanoislands; Co grown on Ag(111) and Ag capped Co islands grown on Cu(111), both forming a Moiré pattern at the surface. The adsorption configuration can by scanning tunneling spectroscopy be linked to the geometric and electronic properties of the substrates and traced back to a Co d-related surface state, illustrating how the modulated reactivity can be used to engineer a pattern of adsorbed molecules on the nanoscale.
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Affiliation(s)
- Sigmund Jensen
- Department of Materials and Production, Aalborg University, Skjernvej 4a, 9220 Aalborg, Denmark.
| | - Isaac Appelquist Løge
- Department of Materials and Production, Aalborg University, Skjernvej 4a, 9220 Aalborg, Denmark.
| | - Jesper Bendix
- Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Lars Diekhöner
- Department of Materials and Production, Aalborg University, Skjernvej 4a, 9220 Aalborg, Denmark.
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5
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Bhatt G, Sharma T, Gupta SK, Meyer F, Rajaraman G, Murugavel R. Tuning Magnetic Anisotropy in Co(II) Tetrahedral Carbazole-Modified Phosphine Oxide Single-Ion Magnets: Importance of Structural Distortion versus Heavy-Ion Effect. Inorg Chem 2023; 62:18915-18925. [PMID: 37947449 DOI: 10.1021/acs.inorgchem.3c02401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
Three mononuclear cobalt(II) tetrahedral complexes [Co(CzPh2PO)2X2] (CzPh2PO = (9H-carbazol-9-yl)diphenylphosphine oxide and X = Cl (1), Br (2), I (3)) have been synthesized using a simple synthetic approach to examine their single-ion magnetic (SIM) behavior. A detailed study of the variation in the dynamic magnetic properties of the Co(II) ion in a tetrahedral ligand field has been carried out by the change of the halide ligand. The axial zero-field splitting parameter D was found to vary from -16.4 cm-1 in 1 to -13.8 cm-1 in 2 and +14.6 cm-1 in 3. All the new complexes exhibit field-induced SIM behavior. The results obtained from ab initio CASSF calculations match well with the experimental data, revealing how halide ions induce a change in the D value as we move from Cl- to I-. The ab initio calculations further reveal that the change in the sign of D is due to the multideterminant characteristics of the ground state wave function of 1 and 2, while single-determinant characteristics are instead observed for 3. To gain a better understanding of the relationship between the structural distortion and the sign and magnitude of D values, magnetostructural D correlations were developed using angular relationships, revealing the importance of structural distortions over the heavy halide effect in controlling the sign of D values. This study broadens the scope of employing electronically and sterically modified phosphine oxide ligands in building new types of air-stable Co(II) SIMs.
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Affiliation(s)
- Gargi Bhatt
- Department of Chemistry, Indian Institute of Technology Bombay, Powai 400076, Mumbai, India
| | - Tanu Sharma
- Department of Chemistry, Indian Institute of Technology Bombay, Powai 400076, Mumbai, India
| | - Sandeep K Gupta
- University of Göttingen, Institute of Inorganic Chemistry, Göttingen D-37077, Germany
| | - Franc Meyer
- University of Göttingen, Institute of Inorganic Chemistry, Göttingen D-37077, Germany
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai 400076, Mumbai, India
| | - Ramaswamy Murugavel
- Department of Chemistry, Indian Institute of Technology Bombay, Powai 400076, Mumbai, India
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6
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Bernhardt M, Korzyński MD, Berkson ZJ, Pointillart F, Le Guennic B, Cador O, Copéret C. Tailored Lewis Acid Sites for High-Temperature Supported Single-Molecule Magnetism. J Am Chem Soc 2023. [PMID: 37262018 DOI: 10.1021/jacs.3c02730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Generating or even retaining slow magnetic relaxation in surface immobilized single-molecule magnets (SMMs) from promising molecular precursors remains a great challenge. Illustrative examples are organolanthanide compounds that show promising SMM properties in molecular systems, though surface immobilization generally diminishes their magnetic performance. Here, we show how tailored Lewis acidic Al(III) sites on a silica surface enable generation of a material with SMM characteristics via chemisorption of (Cpttt)2DyCl ((Cpttt)- = 1,2,4-tri(tert-butyl)-cyclopentadienide). Detailed studies of this system and its diamagnetic Y analogue indicate that the interaction of the metal chloride with surface Al sites results in a change of the coordination sphere around the metal center inducing for the dysprosium-containing material slow magnetic relaxation up to 51 K with hysteresis up to 8 K and an effective energy barrier (Ueff) of 449 cm-1, the highest reported thus far for a supported SMM.
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Affiliation(s)
- Moritz Bernhardt
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog Weg 1-5/10, 8093 Zürich, Switzerland
| | - Maciej D Korzyński
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog Weg 1-5/10, 8093 Zürich, Switzerland
| | - Zachariah J Berkson
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog Weg 1-5/10, 8093 Zürich, Switzerland
| | - Fabrice Pointillart
- Univ Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35000 Rennes, France
| | - Boris Le Guennic
- Univ Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35000 Rennes, France
| | - Olivier Cador
- Univ Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35000 Rennes, France
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog Weg 1-5/10, 8093 Zürich, Switzerland
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7
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Magnetic molecules on surfaces: SMMs and beyond. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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8
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Antiferromagnetically coupled iso-structural CrIII, MnIII and FeIII complexes of a tetradentate Schiff base ligand derived from o-phenylenediamine. TRANSIT METAL CHEM 2022. [DOI: 10.1007/s11243-022-00510-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Field-Induced Single Molecule Magnetic Behavior of Mononuclear Cobalt(II) Schiff Base Complex Derived from 5-Bromo Vanillin. INORGANICS 2022. [DOI: 10.3390/inorganics10080105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
A mononuclear Co(II) complex of a Schiff base ligand derived from 5-Bromo-vanillin and 4-aminoantipyrine, that has a compressed tetragonal bipyramidal geometry and exhibiting field-induced slow magnetic relaxation, has been synthesized and characterized by single crystal X-ray diffraction, elemental analysis and molecular spectroscopy. In the crystal packing, a hydrogen-bonded dimer structural topology has been observed with two distinct metal centers having slightly different bond parameters. The complex has been further investigated for its magnetic nature on a SQUID magnetometer. The DC magnetic data confirm that the complex behaves as a typical S = 3/2 spin system with a sizable axial zero-field splitting parameter D/hc = 38 cm−1. The AC susceptibility data reveal that the relaxation time for the single-mode relaxation process is τ = 0.16(1) ms at T = 2.0 K and BDC = 0.12 T.
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Dey S, Rajaraman G. Attaining record-high magnetic exchange, magnetic anisotropy and blocking barriers in dilanthanofullerenes. Chem Sci 2021; 12:14207-14216. [PMID: 34760206 PMCID: PMC8565386 DOI: 10.1039/d1sc03925c] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 10/06/2021] [Indexed: 11/29/2022] Open
Abstract
While the blocking barrier (U eff) and blocking temperature (T B) for "Dysprocenium" SIMs have been increased beyond liquid N2 temperature, device fabrication of these molecules remains a challenge as low-coordinate Ln3+ complexes are very unstable. Encapsulating the lanthanide ion inside a cage such as a fullerene (called endohedral metallofullerene or EMF) opens up a new avenue leading to several Ln@EMF SMMs. The ab initio CASSCF calculations play a pivotal role in identifying target metal ions and suitable cages in this area. Encouraged by our earlier prediction on Ln2@C79N, which was verified by experiments, here we have undertaken a search to enhance the exchange coupling in this class of molecules beyond the highest reported value. Using DFT and ab initio calculations, we have studied a series of Gd2@C2n (30 ≤ 2n ≤ 80), where an antiferromagnetic J Gd⋯Gd of -43 cm-1 was found for a stable Gd2@C38-D 3h cage. This extremely large and exceptionally rare 4f⋯4f interaction results from a direct overlap of 4f orbitals due to the confinement effect. In larger cages such as Gd2@C60 and Gd2@C80, the formation of two centre-one-electron (2c-1e-) Gd-Gd bonds is perceived. This results in a radical formation in the fullerene cage leading to its instability. To avoid this, we have studied heterofullerenes where one of the carbon atoms is replaced by a nitrogen atom. Specifically, we have studied Ln2@C59N and Ln2@C79N, where strong delocalisation of the electron yields a mixed valence-like behaviour. This suggests a double-exchange (B) is operational, and CASSCF calculations yield a B value of 434.8 cm-1 and resultant J Gd-rad of 869.5 cm-1 for the Gd2@C59N complex. These parameters are found to be two times larger than the world-record J reported for Gd2@C79N. Further ab initio calculations reveal an unprecedented U cal of 1183 and 1501 cm-1 for Dy2@C59N and Tb2@C59N, respectively. Thus, this study offers strong exchange coupling as criteria for new generation SMMs as the existing idea of enhancing the blocking barrier via crystal field modulation has reached its saturation point.
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Affiliation(s)
- Sourav Dey
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai 400076 India
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11
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Haraguchi T, Otsubo K, Sakata O, Fujiwara A, Kitagawa H. Strain-Controlled Spin Transition in Heterostructured Metal-Organic Framework Thin Film. J Am Chem Soc 2021; 143:16128-16135. [PMID: 34514790 DOI: 10.1021/jacs.1c06662] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Metal-organic framework (MOF) thin films have recently attracted much attention as a new platform for surface/interface research, where unconventional structural and physical properties emerge. Among the many MOFs as candidates for fabrication of thin films, Hofmann-type MOFs {Fe(pz)[M(CN)4]} [pz = pyrazine; M = Ni (Nipz), M = Pt (Ptpz)] are attractive, because they undergo spin transitions with concomitant structural changes. Here, we demonstrate the first example of a strain-controlled spin transition in heterostructured MOF thin films. The spin transition temperature of Ptpz can be controlled in the temperature range of 300-380 K by fabricating a nanometer-sized heterostructured thin film with a Nipz buffer layer, where the smaller lattice of Nipz causes epitaxial compressive strain to the Ptpz layer. The fabricated heterostructured thin film exhibited a remarkable increase in spin transition temperature with a dynamic structural transformation, confirmed by variable-temperature (VT) X-ray diffraction and VT Raman spectroscopy. By verifying interfacial strain in a heterostructured thin film, we can rationally control the characteristics of MOFs-not only spin transition but also various physical properties such as gas storage, catalysis, sensing, proton conductivity, and electrical properties, among others.
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Affiliation(s)
- Tomoyuki Haraguchi
- Department of Chemistry, Graduate School of Science, Tokyo University of Science, 1-3 Kagurazaka, Sinjuku-ku, Tokyo 162-8601, Japan.,Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kazuya Otsubo
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Osami Sakata
- Center for Synchrotron Radiation Research, Japan Synchrotron Radiation Research Institute (JASRI), Sayo-gun, Hyogo 679-5198, Japan
| | - Akihiko Fujiwara
- School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
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12
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Theoretical Investigation of the Prospect to Tailor ZnO Electronic Properties with VP Thin Films. NANOMATERIALS 2021; 11:nano11061412. [PMID: 34071773 PMCID: PMC8227150 DOI: 10.3390/nano11061412] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/23/2021] [Accepted: 05/24/2021] [Indexed: 01/07/2023]
Abstract
The atomic and electronic structure of vanadium phosphide one- to four-atomic-layer thin films and their composites with zinc oxide substrate are modelled by means of quantum chemistry. Favorable vanadium phosphide to ZnO orientation is defined and found to remain the same for all the structures under consideration. The electronic structure of the composites is analyzed in detail. The features of the charge and spin density distribution are discussed.
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13
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Kizaki K, Santria A, Ishikawa N. Intramolecular Magnetic Interaction in a Photogenerated Dual Angular Momentum System in a Terbium-Phthalocyaninato 1:1 Complex. Inorg Chem 2021; 60:2037-2044. [PMID: 33448844 DOI: 10.1021/acs.inorgchem.0c03524] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Intramolecular magnetic interaction between a localized open-shell 4f-electronic system and a photoexcited macrocyclic π-conjugate system in terbium-phthalocyaninnato (Tb-Pc) 1:1 complex was investigated using variable-temperature variable-field magnetic circular dichroism (VTVH MCD) spectroscopy. The 1:1 complex [Tb(Pc)(cyclen)]Cl (Pc2- = phthalocyaninato dianion, cyclen = 1,4,7,10-tetraazacyclododecane) with the capping ligand providing an exact fourfold symmetry showed a significant temperature dependence and a nonlinear field dependence in the MCD intensity of the Pc-centered highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) π-π* transition, while a diamagnetic congener [Y(Pc)(cyclen)]Cl showed a temperature-independent MCD with a linear-field dependence. This indicates that the (4f)8 system of the Tb ion with a total angular momentum J and the photoexcited π-system of the Pc macrocycle with an orbital angular momentum L are magnetically coupled. By numerical simulation using a model where ground doublet state |Jz⟩ = |±6⟩ and excited quartet state |Jz, Lz⟩ = |±6, ±|Lz|⟩ are included, the J-L interaction magnitude ΔJL and the Pc-centered orbital angular momentum |Lz|ℏ were determined to be 1.1 cm-1 and 2.0 ℏ, respectively. From ab initio restricted active space self-consistent field (RASSCF)-restricted active space state interaction (RASSI) calculations on the π-π* excited states of the Tb complex, the magnitude of the J-L interaction was estimated. The comparison between the calculations on the Y and Tb complexes revealed that the ferromagnetic-type coupling occurs between the orbital component in the J of Tb and the L on Pc, supporting the model that we employed for the analysis of the experimental data.
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Affiliation(s)
- Kazuro Kizaki
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyamacho, Toyonaka, Osaka 560-0043, Japan
| | - Anas Santria
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyamacho, Toyonaka, Osaka 560-0043, Japan
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyamacho, Toyonaka, Osaka 560-0043, Japan
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14
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Avvisati G, Gargiani P, Mariani C, Betti MG. Tuning the Magnetic Coupling of a Molecular Spin Interface via Electron Doping. NANO LETTERS 2021; 21:666-672. [PMID: 33356332 DOI: 10.1021/acs.nanolett.0c04256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Mastering the magnetic response of molecular spin interfaces by tuning the occupancy of the molecular orbitals, which carry the spin magnetic moment, can be accomplished by electron doping. We propose a viable route to control the magnetization direction and magnitude of a molecular spin network, in a graphene-mediated architecture, achieved via alkali doping of manganese phthalocyanine (MnPc) molecules assembled on cobalt intercalated under a graphene membrane. The antiparallel magnetic alignment of the MnPc molecules with the underlying Co layer can be switched to a ferromagnetic state by electron doping. Multiplet calculations unveil an enhanced magnetic state of the Mn centers with a 3/2 to 5/2 spin transition induced by alkali doping, as confirmed by the steepening of the hysteresis loops, with higher saturation magnetization values. This new molecular spin configuration can be aligned by an external field, almost independently from the hard-magnet substrate effectively behaving as a free magnetic layer.
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Affiliation(s)
- Giulia Avvisati
- Physics Department, Sapienza University of Rome, Piazzale Aldo Moro, 5 00185 Rome, Italy
| | - Pierluigi Gargiani
- ALBA Synchrotron Light Source, Carrer de la Llum, 2-26 08290 Barcelona, Spain
| | - Carlo Mariani
- Physics Department, Sapienza University of Rome, Piazzale Aldo Moro, 5 00185 Rome, Italy
| | - Maria Grazia Betti
- Physics Department, Sapienza University of Rome, Piazzale Aldo Moro, 5 00185 Rome, Italy
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15
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Kelai M, Cahier B, Atanasov M, Neese F, Tong Y, Zhang L, Bellec A, Iasco O, Rivière E, Guillot R, Chacon C, Girard Y, Lagoute J, Rousset S, Repain V, Otero E, Arrio MA, Sainctavit P, Barra AL, Boillot ML, Mallah T. Robust magnetic anisotropy of a monolayer of hexacoordinate Fe( ii) complexes assembled on Cu(111). Inorg Chem Front 2021. [DOI: 10.1039/d1qi00085c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tris pyrazolyl borate ligand imposes a rigid scaffold around Fe(ii) ensuring a robust magnetic anisotropy when the molecules assembled as monolayers suffer from the dissymmetric environment of the substrate/vacuum interface.
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16
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Huzan MS, Fix M, Aramini M, Bencok P, Mosselmans JFW, Hayama S, Breitner FA, Gee LB, Titus CJ, Arrio MA, Jesche A, Baker ML. Single-ion magnetism in the extended solid-state: insights from X-ray absorption and emission spectroscopy. Chem Sci 2020; 11:11801-11810. [PMID: 34123206 PMCID: PMC8162461 DOI: 10.1039/d0sc03787g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Large single-ion magnetic anisotropy is observed in lithium nitride doped with iron. The iron sites are two-coordinate, putting iron doped lithium nitride amongst a growing number of two coordinate transition metal single-ion magnets (SIMs). Uniquely, the relaxation times to magnetisation reversal are over two orders of magnitude longer in iron doped lithium nitride than other 3d-metal SIMs, and comparable with high-performance lanthanide-based SIMs. To understand the origin of these enhanced magnetic properties a detailed characterisation of electronic structure is presented. Access to dopant electronic structure calls for atomic specific techniques, hence a combination of detailed single-crystal X-ray absorption and emission spectroscopies are applied. Together K-edge, L2,3-edge and Kβ X-ray spectroscopies probe local geometry and electronic structure, identifying iron doped lithium nitride to be a prototype, solid-state SIM, clean of stoichiometric vacancies where Fe lattice sites are geometrically equivalent. Extended X-ray absorption fine structure and angular dependent single-crystal X-ray absorption near edge spectroscopy measurements determine FeI dopant ions to be linearly coordinated, occupying a D6h symmetry pocket. The dopant engages in strong 3dπ-bonding, resulting in an exceptionally short Fe–N bond length (1.873(7) Å) and rigorous linearity. It is proposed that this structure protects dopant sites from Renner–Teller vibronic coupling and pseudo Jahn–Teller distortions, enhancing magnetic properties with respect to molecular-based linear complexes. The Fe ligand field is quantified by L2,3-edge XAS from which the energy reduction of 3dz2 due to strong 4s mixing is deduced. Quantification of magnetic anisotropy barriers in low concentration dopant sites is inhibited by many established methods, including far-infrared and neutron scattering. We deduce variable temperature L3-edge XAS can be applied to quantify the J = 7/2 magnetic anisotropy barrier, 34.80 meV (∼280 cm−1), that corresponds with Orbach relaxation via the first excited, MJ = ±5/2 doublet. The results demonstrate that dopant sites within solid-state host lattices could offer a viable alternative to rare-earth bulk magnets and high-performance SIMs, where the host matrix can be tailored to impose high symmetry and control lattice induced relaxation effects. Taking advantage of synchrotron light source methods, we present the geometric and electronic structure of iron doped in lithium nitride.![]()
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Affiliation(s)
- Myron S Huzan
- The University of Manchester at Harwell, Diamond Light Source Harwell Campus OX11 0DE UK .,Department of Chemistry, The University of Manchester Manchester M13 9PL UK
| | - Manuel Fix
- EP VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg D-86159 Augsburg Germany
| | - Matteo Aramini
- Diamond Light Source, Harwell Science and Innovation Campus Chilton Didcot OX11 0DE UK
| | - Peter Bencok
- Diamond Light Source, Harwell Science and Innovation Campus Chilton Didcot OX11 0DE UK
| | | | - Shusaku Hayama
- Diamond Light Source, Harwell Science and Innovation Campus Chilton Didcot OX11 0DE UK
| | - Franziska A Breitner
- EP VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg D-86159 Augsburg Germany
| | - Leland B Gee
- Department of Chemistry, Stanford University Stanford CA 94305 USA
| | - Charles J Titus
- Department of Physics, Stanford University Stanford CA 94305 USA
| | - Marie-Anne Arrio
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, IRD, MNHN, UMR7590 75252 Paris Cedex 05 France
| | - Anton Jesche
- EP VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg D-86159 Augsburg Germany
| | - Michael L Baker
- The University of Manchester at Harwell, Diamond Light Source Harwell Campus OX11 0DE UK .,Department of Chemistry, The University of Manchester Manchester M13 9PL UK
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17
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Navas A, Jannus F, Fernández B, Cepeda J, Medina O’Donnell M, Díaz-Ruiz L, Sánchez-González C, Llopis J, Seco JM, Rufino-Palomares E, Lupiáñez JA, Gómez-Ruiz S, Quiles JL, Battino M, Choquesillo-Lazarte D, Ruiz-Muelle AB, Fernández I, Reyes-Zurita F, Rodríguez-Diéguez A. Designing Single-Molecule Magnets as Drugs with Dual Anti-Inflammatory and Anti-Diabetic Effects. Int J Mol Sci 2020; 21:ijms21093146. [PMID: 32365648 PMCID: PMC7246571 DOI: 10.3390/ijms21093146] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 04/28/2020] [Accepted: 04/28/2020] [Indexed: 12/19/2022] Open
Abstract
We have designed and synthesized two novel cobalt coordination compounds using bumetanide (bum) and indomethacin (ind) therapeutic agents. The anti-inflammatory effects of cobalt metal complexes with ind and bum were assayed in lipopolysaccharide stimulated RAW 264.7 macrophages by inhibition of nitric oxide production. Firstly, we determined the cytotoxicity and the anti-inflammatory potential of the cobalt compounds and ind and bum ligands in RAW 264.7 cells. Indomethacin-based metal complex was able to inhibit the NO production up to 35% in a concentration-dependent manner without showing cytotoxicity, showing around 6–37 times more effective than indomethacin. Cell cycle analysis showed that the inhibition of NO production was accompanied by a reversion of the differentiation processes in LPS-stimulated RAW 264.7 cells, due to a decreased of cell percentage in G0/G1 phase, with the corresponding increase in the number of cells in S phase. These two materials have mononuclear structures and show slow relaxation of magnetization. Moreover, both compounds show anti-diabetic activity with low in vitro cell toxicities. The formation of metal complexes with bioactive ligands is a new and promising strategy to find new compounds with high and enhanced biochemical properties and promises to be a field of great interest.
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Affiliation(s)
- Arturo Navas
- Department of Inorganic Chemistry, C/ Severo Ochoa s/n, University of Granada, 18071 Granada, Spain;
| | - Fatin Jannus
- Department of Biochemistry and Molecular Biology I, Severo Ochoa s/n, University of Granada, 18071 Granada, Spain; (F.J.); (L.D.-R.); (E.R.-P.); (J.A.L.)
| | - Belén Fernández
- Institute of Parasitology and Biomedicine “López-Neyra”, CSIC, Av. Conocimiento s/n, 18600 Granada, Spain
- Correspondence: (B.F.); (J.L.Q.); (F.R.-Z.); (A.R.-D.); Tel.: +349-5818-1621 (B.F.); +34-958-24-0057 (J.L.Q.); +34-958-24-3252 (F.R.-Z.); +349-5824-8524 (A.R.-D.)
| | - Javier Cepeda
- Department of Applied Chemistry, University of The Basque Country (UPV/EHU), 20018 San Sebastián, Spain; (J.C.); (J.M.S.)
| | - Marta Medina O’Donnell
- Department of Organic Chemistry, C/ Severo Ochoa s/n, University of Granada, 18071 Granada, Spain;
| | - Luis Díaz-Ruiz
- Department of Biochemistry and Molecular Biology I, Severo Ochoa s/n, University of Granada, 18071 Granada, Spain; (F.J.); (L.D.-R.); (E.R.-P.); (J.A.L.)
| | - Cristina Sánchez-González
- Department of Physiology, University Campus of Cartuja, University of Granada, 18071 Granada, Spain; (C.S.-G.); (J.L.)
| | - Juan Llopis
- Department of Physiology, University Campus of Cartuja, University of Granada, 18071 Granada, Spain; (C.S.-G.); (J.L.)
| | - José M. Seco
- Department of Applied Chemistry, University of The Basque Country (UPV/EHU), 20018 San Sebastián, Spain; (J.C.); (J.M.S.)
| | - E. Rufino-Palomares
- Department of Biochemistry and Molecular Biology I, Severo Ochoa s/n, University of Granada, 18071 Granada, Spain; (F.J.); (L.D.-R.); (E.R.-P.); (J.A.L.)
| | - José Antonio Lupiáñez
- Department of Biochemistry and Molecular Biology I, Severo Ochoa s/n, University of Granada, 18071 Granada, Spain; (F.J.); (L.D.-R.); (E.R.-P.); (J.A.L.)
| | - Santiago Gómez-Ruiz
- Department of Biology and Geology, Physics and Inorganic Chemistry, Rey Juan Carlos University, Calle Tulipán s/n, 28933 Móstoles (Madrid), Spain;
| | - José Luis Quiles
- Department of Physiology. Institute of Nutrition and Food Technology “Jose Mataix”, Biomedical Research Center, Avda. Conocimiento s/n, 18100 Armilla, Spain
- Correspondence: (B.F.); (J.L.Q.); (F.R.-Z.); (A.R.-D.); Tel.: +349-5818-1621 (B.F.); +34-958-24-0057 (J.L.Q.); +34-958-24-3252 (F.R.-Z.); +349-5824-8524 (A.R.-D.)
| | - Maurizio Battino
- Department of Clinical Specialist and Odontostomatological Sciences (DISCO) -Sez. Biochemistry, Faculty of Medicine, Polytechnic University of Marche, 60131 Ancona, Italy;
| | - Duane Choquesillo-Lazarte
- Laboratorio de Estudios Cristalográficos, IACT (CSIC-UGR), Avda. de las Palmeras 4, 18100 Armilla, Spain;
| | - Ana Belén Ruiz-Muelle
- Department of Chemistry and Physics, Research Centre CIAIMBITAL, University of Almería, Ctra. Sacramento s/n, 04120 Almería, Spain; (A.B.R.-M.); (I.F.)
| | - Ignacio Fernández
- Department of Chemistry and Physics, Research Centre CIAIMBITAL, University of Almería, Ctra. Sacramento s/n, 04120 Almería, Spain; (A.B.R.-M.); (I.F.)
| | - Fernando Reyes-Zurita
- Department of Biochemistry and Molecular Biology I, Severo Ochoa s/n, University of Granada, 18071 Granada, Spain; (F.J.); (L.D.-R.); (E.R.-P.); (J.A.L.)
- Correspondence: (B.F.); (J.L.Q.); (F.R.-Z.); (A.R.-D.); Tel.: +349-5818-1621 (B.F.); +34-958-24-0057 (J.L.Q.); +34-958-24-3252 (F.R.-Z.); +349-5824-8524 (A.R.-D.)
| | - Antonio Rodríguez-Diéguez
- Department of Inorganic Chemistry, C/ Severo Ochoa s/n, University of Granada, 18071 Granada, Spain;
- Correspondence: (B.F.); (J.L.Q.); (F.R.-Z.); (A.R.-D.); Tel.: +349-5818-1621 (B.F.); +34-958-24-0057 (J.L.Q.); +34-958-24-3252 (F.R.-Z.); +349-5824-8524 (A.R.-D.)
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18
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Huang P, Zhang P, Xu S, Wang H, Zhang X, Zhang H. Recent advances in two-dimensional ferromagnetism: materials synthesis, physical properties and device applications. NANOSCALE 2020; 12:2309-2327. [PMID: 31930261 DOI: 10.1039/c9nr08890c] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two-dimensional (2D) ferromagnetism is critical for both scientific investigation and technological development owing to its low-dimensionality that brings in quantization of electronic states as well as free axes for device modulation. However, the scarcity of high-temperature 2D ferromagnets has been the obstacle of many research studies, such as the quantum anomalous Hall effect (QAHE) and thin-film spintronics. Indeed, in the case of the isotropic Heisenberg model with finite-range exchange interactions as an example, low-dimensionality is shown to be contraindicated with ferromagnetism. However, the advantages of low-dimensionality for micro-scale patterning could enhance the Curie temperature (TC) of 2D ferromagnets beyond the TC of bulk materials, opening the door for designing high-temperature ferromagnets in the 2D limit. In this paper, we review the recent advances in the field of 2D ferromagnets, including their material systems, physical properties, and potential device applications.
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Affiliation(s)
- Pu Huang
- Shenzhen Key Laboratory of Flexible Memory Materials and Devices, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Peng Zhang
- Shenzhen Key Laboratory of Flexible Memory Materials and Devices, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Shaogang Xu
- Shenzhen Key Laboratory of Flexible Memory Materials and Devices, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Huide Wang
- Collaborative Innovation Centre for Optoelectronic Science & Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Xiuwen Zhang
- Shenzhen Key Laboratory of Flexible Memory Materials and Devices, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Han Zhang
- Collaborative Innovation Centre for Optoelectronic Science & Technology, and Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
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19
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Mitcov D, Pedersen AH, Ceccato M, Gelardi RM, Hassenkam T, Konstantatos A, Reinholdt A, Sørensen MA, Thulstrup PW, Vinum MG, Wilhelm F, Rogalev A, Wernsdorfer W, Brechin EK, Piligkos S. Molecular multifunctionality preservation upon surface deposition for a chiral single-molecule magnet. Chem Sci 2019; 10:3065-3073. [PMID: 30996888 PMCID: PMC6428142 DOI: 10.1039/c8sc04917c] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 01/23/2019] [Indexed: 01/06/2023] Open
Abstract
Simultaneous retention of SMM behaviour and of optical activity is demonstrated upon surface deposition for a chiral SMM.
The synthesis and characterization of a chiral, enneanuclear Mn(iii)-based, Single-Molecule Magnet, [Mn9O4(Me-sao)6(L)3(MeO)3(MeOH)3]Cl (1; Me-saoH2 = methylsalicylaldoxime, HL = lipoic acid) is reported. Compound 1 crystallizes in the orthorhombic P212121 space group and consists of a metallic skeleton describing a defect super-tetrahedron missing one vertex. The chirality of the [MnIII9] core originates from the directional bridging of the Me-sao2– ligands via the –N–O– oximate moieties, which define a clockwise (1ΔΔ) or counter-clockwise (1ΛΛ) rotation in both the upper [MnIII3] and lower [MnIII6] subunits. Structural integrity and retention of chirality upon dissolution and upon deposition on (a) gold nanoparticles, 1@AuNPs, (b) transparent Au(111) surfaces, 1ΛΛ@t-Au(111); 1ΔΔ@t-Au(111), and (c) epitaxial Au(111) on mica surfaces, 1@e-Au(111), was confirmed by CD and IR spectroscopies, mass spectrometry, TEM, XPS, XAS, and AFM. Magnetic susceptibility and magnetization measurements demonstrate the simultaneous retention of SMM behaviour and optical activity, from the solid state, via dissolution, to the surface deposited species.
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Affiliation(s)
- Dmitri Mitcov
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Anders H Pedersen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Marcel Ceccato
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Rikke M Gelardi
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Tue Hassenkam
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Andreas Konstantatos
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Anders Reinholdt
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Mikkel A Sørensen
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Peter W Thulstrup
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Morten G Vinum
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
| | - Fabrice Wilhelm
- ESRF-The European Synchrotron , CS 40220 , 38043 Grenoble Cedex 9 , France
| | - Andrei Rogalev
- ESRF-The European Synchrotron , CS 40220 , 38043 Grenoble Cedex 9 , France
| | - Wolfgang Wernsdorfer
- Institute Néel , CNRS , BP 166 , 25 Avenue de Martyrs , Grenoble , 38042 Cedex 9 , France
| | - Euan K Brechin
- EaStCHEM School of Chemistry , The University of Edinburgh , David Brewster Road , Edinburgh , EH9 3FJ , UK
| | - Stergios Piligkos
- Department of Chemistry , University of Copenhagen , Universitetsparken 5 , DK-2100 , Copenhagen , Denmark .
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20
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Rosado Piquer L, Escoda-Torroella M, Ledezma Gairaud M, Carneros S, Daffé N, Studniarek M, Dreiser J, Wernsdorfer W, Sañudo EC. Hysteresis enhancement on a hybrid Dy(iii) single molecule magnet/iron oxide nanoparticle system. Inorg Chem Front 2019. [DOI: 10.1039/c8qi01346b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A novel hybrid NP-Dy12 system presents an enhancement of the magnetization hysteresis with respect to the isolated components while retaining the morphological characteristics of the parent NPs.
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Affiliation(s)
- Lidia Rosado Piquer
- Institut de Nanociència i Nanotecnologia-UB
- Barcelona
- Spain
- Secció de Química Inorgànica
- Departament de Química Inorgànica i Orgànica
| | - Mariona Escoda-Torroella
- Institut de Nanociència i Nanotecnologia-UB
- Barcelona
- Spain
- Secció de Química Inorgànica
- Departament de Química Inorgànica i Orgànica
| | - Marisol Ledezma Gairaud
- Escuela de Química
- Universidad de Costa Rica
- San José
- Costa Rica
- Centro de Electroquímica y Energía Química
| | - Saul Carneros
- Secció de Química Inorgànica
- Departament de Química Inorgànica i Orgànica
- Universitat de Barcelona
- Av. Diagonal 645
- Spain
| | - Niéli Daffé
- Swiss Light Source
- Paul Scherrer Institute
- Villigen PSI
- Switzerland
| | | | - Jan Dreiser
- Swiss Light Source
- Paul Scherrer Institute
- Villigen PSI
- Switzerland
| | | | - E. Carolina Sañudo
- Institut de Nanociència i Nanotecnologia-UB
- Barcelona
- Spain
- Secció de Química Inorgànica
- Departament de Química Inorgànica i Orgànica
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21
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Interplay of Spin and Spatial Anisotropy in Low-Dimensional Quantum Magnets with Spin 1/2. CRYSTALS 2018. [DOI: 10.3390/cryst9010006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Quantum Heisenberg chain and square lattices are important paradigms of a low-dimensional magnetism. Their ground states are determined by the strength of quantum fluctuations. Correspondingly, the ground state of a rectangular lattice interpolates between the spin liquid and the ordered collinear Néel state with the partially reduced order parameter. The diversity of additional exchange interactions offers variety of quantum models derived from the aforementioned paradigms. Besides the spatial anisotropy of the exchange coupling, controlling the lattice dimensionality and ground-state properties, the spin anisotropy (intrinsic or induced by the magnetic field) represents another important effect disturbing a rotational symmetry of the spin system. The S = 1/2 easy-axis and easy-plane XXZ models on the square lattice even for extremely weak spin anisotropies undergo Heisenberg-Ising and Heisenberg-XY crossovers, respectively, acting as precursors to the onset of the finite-temperature phase transitions within the two-dimensional Ising universality class (for the easy axis anisotropy) and a topological Berezinskii–Kosterlitz–Thouless phase transition (for the easy-plane anisotropy). Experimental realizations of the S = 1/2 two-dimensional XXZ models in bulk quantum magnets appeared only recently. Partial solutions of the problems associated with their experimental identifications are discussed and some possibilities of future investigations in quantum magnets on the square and rectangular lattice are outlined.
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22
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Majcher AM, Dąbczyński P, Marzec MM, Ceglarska M, Rysz J, Bernasik A, Ohkoshi SI, Stefańczyk O. Between single ion magnets and macromolecules: a polymer/transition metal-based semi-solid solution. Chem Sci 2018; 9:7277-7286. [PMID: 30288249 PMCID: PMC6148685 DOI: 10.1039/c8sc02277a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 08/03/2018] [Indexed: 11/21/2022] Open
Abstract
The creation of functional magnetic materials for application in high-density memory storage or in the new field of molecular spintronics is a matter of widespread interest among the material research community. Herein, we describe a new approach that combines the qualities of single ion magnets, displaying slow magnetic relaxations, and the merits of polymers, being easy to process and widely used to produce thin films. Basing the idea on cobalt(ii) ions and pyridine-based single ion magnets, a new macromolecular magnetic material was obtained - a polymeric matrix of poly(4-vinylpyridine) (P4VP) cross-linked by a cobalt(ii) salt bound within it, effectively forming a network of single ion magnets, with field-induced magnetic relaxations preserved in both bulk and thin film forms. The binding of cobalt is confirmed by a series of methods, like secondary ion mass spectroscopy or high-resolution X-ray photoelectron spectroscopy. The magnetic relaxation times, up to 5 × 10-6 s, are controllable simply by dilution, making this new material a semi-solid solution. By this approach, a new path is formed to connect molecular magnetism and polymer science, showing that the easy polymer processing can be used in forming self-organizing functional magnetic thin films.
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Affiliation(s)
- Anna M Majcher
- Faculty of Physics, Astronomy and Applied Computer Science , Jagiellonian University , Łojasiewicza 11 , 30-348 Krakow , Poland .
| | - Paweł Dąbczyński
- Faculty of Physics, Astronomy and Applied Computer Science , Jagiellonian University , Łojasiewicza 11 , 30-348 Krakow , Poland .
| | - Mateusz M Marzec
- Academic Centre for Materials and Nanotechnology , AGH University of Science and Technology , al. Mickiewicza 30 , 30-049 Kraków , Poland
| | - Magdalena Ceglarska
- Faculty of Physics, Astronomy and Applied Computer Science , Jagiellonian University , Łojasiewicza 11 , 30-348 Krakow , Poland .
| | - Jakub Rysz
- Faculty of Physics, Astronomy and Applied Computer Science , Jagiellonian University , Łojasiewicza 11 , 30-348 Krakow , Poland .
| | - Andrzej Bernasik
- Academic Centre for Materials and Nanotechnology , AGH University of Science and Technology , al. Mickiewicza 30 , 30-049 Kraków , Poland
- Faculty of Physics and Applied Computer Science , AGH University of Science and Technology , al. Mickiewicza 30 , 30-049 Kraków , Poland
| | - Shin-Ichi Ohkoshi
- Department of Chemistry , School of Science , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan,
| | - Olaf Stefańczyk
- Department of Chemistry , School of Science , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan,
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23
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Rosado Piquer L, Sánchez RR, Sañudo EC, Echeverría J. Understanding the Molecule-Electrode Interface for Molecular Spintronic Devices: A Computational and Experimental Study. Molecules 2018; 23:molecules23061441. [PMID: 29899309 PMCID: PMC6100063 DOI: 10.3390/molecules23061441] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/28/2018] [Accepted: 05/28/2018] [Indexed: 11/16/2022] Open
Abstract
A triple-decker SYML-Dy2 single-molecule magnet (SMM) was synthetized and grafted onto the surface of iron oxide nanoparticles (IO-NPs) coated by an oleic acid monolayer. The magnetism of the SYML-Dy2 complex, and the hybrid system, NP-Dy2, were studied by a superconducting quantum interference device (SQUID). Density functional theory (DFT) calculations were carried out to study both the energetics of the interaction between SYML-Dy2 complex to the organic capping, and the assembly presented by the oleic acid chains.
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Affiliation(s)
- Lidia Rosado Piquer
- Departament de Química Inorgànica, Secció de Química Inorgànica; C/Martí i Franqués 1-11, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), C/Martí i Franqués 1-11, 08028 Barcelona, Spain.
| | - Raquel Royo Sánchez
- Departament de Química Inorgànica, Secció de Química Inorgànica; C/Martí i Franqués 1-11, 08028 Barcelona, Spain.
| | - E Carolina Sañudo
- Departament de Química Inorgànica, Secció de Química Inorgànica; C/Martí i Franqués 1-11, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), C/Martí i Franqués 1-11, 08028 Barcelona, Spain.
| | - Jorge Echeverría
- Departament de Química Inorgànica, Secció de Química Inorgànica; C/Martí i Franqués 1-11, 08028 Barcelona, Spain.
- Institut de Química Teòrica i Computacional (IQTC-UB), Universitat Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Spain.
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24
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Introducing Magnetism into 2D Nonmagnetic Inorganic Layered Crystals: A Brief Review from First-Principles Aspects. CRYSTALS 2018. [DOI: 10.3390/cryst8010024] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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25
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Cinchetti M, Dediu VA, Hueso LE. Activating the molecular spinterface. NATURE MATERIALS 2017; 16:507-515. [PMID: 28439116 DOI: 10.1038/nmat4902] [Citation(s) in RCA: 140] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 03/23/2017] [Indexed: 05/19/2023]
Abstract
The miniaturization trend in the semiconductor industry has led to the understanding that interfacial properties are crucial for device behaviour. Spintronics has not been alien to this trend, and phenomena such as preferential spin tunnelling, the spin-to-charge conversion due to the Rashba-Edelstein effect and the spin-momentum locking at the surface of topological insulators have arisen mainly from emergent interfacial properties, rather than the bulk of the constituent materials. In this Perspective we explore inorganic/molecular interfaces by looking closely at both sides of the interface. We describe recent developments and discuss the interface as an ideal platform for creating new spin effects. Finally, we outline possible technologies that can be generated thanks to the unique active tunability of molecular spinterfaces.
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Affiliation(s)
- Mirko Cinchetti
- Experimentelle Physik VI, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - V Alek Dediu
- Istituto per lo Studio dei Materiali Nanostrutturati CNRISMN, 40129 Bologna, Italy
| | - Luis E Hueso
- CIC nanoGUNE, 20018 San Sebastian, Spain
- IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
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26
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Allouche F, Lapadula G, Siddiqi G, Lukens WW, Maury O, Le Guennic B, Pointillart F, Dreiser J, Mougel V, Cador O, Copéret C. Magnetic Memory from Site Isolated Dy(III) on Silica Materials. ACS CENTRAL SCIENCE 2017; 3:244-249. [PMID: 28386602 PMCID: PMC5364447 DOI: 10.1021/acscentsci.7b00035] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Indexed: 05/26/2023]
Abstract
Achieving magnetic remanence at single isolated metal sites dispersed at the surface of a solid matrix has been envisioned as a key step toward information storage and processing in the smallest unit of matter. Here, we show that isolated Dy(III) sites distributed at the surface of silica nanoparticles, prepared with a simple and scalable two-step process, show magnetic remanence and display a hysteresis loop open at liquid 4He temperature, in contrast to the molecular precursor which does not display any magnetic memory. This singular behavior is achieved through the controlled grafting of a tailored Dy(III) siloxide complex on partially dehydroxylated silica nanoparticles followed by thermal annealing. This approach allows control of the density and the structure of isolated, "bare" Dy(III) sites bound to the silica surface. During the process, all organic fragments are removed, leaving the surface as the sole ligand, promoting magnetic remanence.
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Affiliation(s)
- Florian Allouche
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland
| | - Giuseppe Lapadula
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland
| | - Georges Siddiqi
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland
| | - Wayne W. Lukens
- Chemical
Sciences Division, Lawrence Berkeley National
Laboratory, Berkeley, California 94720, United States
| | - Olivier Maury
- Univ
Lyon, Ecole Normale supérieure de Lyon, Laboratoire de Chimie
UMR 5182 CNRS—Université Claude Bernard Lyon 1—ENS
Lyon, 46 Allée
d’Italie, 69364 Lyon Cedex 07, France
| | - Boris Le Guennic
- Institut
des Sciences Chimiques de Rennes UMR 6226 CNRS-UR1, Université de Rennes 1, 35042 Rennes Cedex, France
| | - Fabrice Pointillart
- Institut
des Sciences Chimiques de Rennes UMR 6226 CNRS-UR1, Université de Rennes 1, 35042 Rennes Cedex, France
| | - Jan Dreiser
- Swiss
Light Source, Paul Scherrer Institute, CH-5232 Villigen
PSI, Switzerland
| | - Victor Mougel
- Laboratoire
de Chimie des Processus Biologiques, CNRS UMR 8229, Collège
de France, Université Pierre et Marie
Curie, 11 Place Marcelin
Berthelot, 75231 Paris Cedex 05, France
| | - Olivier Cador
- Institut
des Sciences Chimiques de Rennes UMR 6226 CNRS-UR1, Université de Rennes 1, 35042 Rennes Cedex, France
| | - Christophe Copéret
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, CH-8093 Zürich, Switzerland
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27
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Muñoz-Becerra K, Aravena D, Ruiz E, Spodine E, Soto-Donoso N, Paredes-García V, Venegas-Yazigi D. Models to predict the magnetic properties of single- and multiple-bridged phosphate CuII systems: a theoretical DFT insight. Inorg Chem Front 2017. [DOI: 10.1039/c6qi00394j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Models for the 1,1 and 1,3-bridging modes of phosphate for copper(ii) compounds were developed. Using unrestricted corresponding orbitals (UCO), a graphical identification of the predominant exchange pathway was described.
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Affiliation(s)
- K. Muñoz-Becerra
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago
- Chile
| | - D. Aravena
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago
- Chile
- Centro para el Desarrollo de la Nanociencia y Nanotecnología
| | - E. Ruiz
- Departament de Química Inorgànica i Orgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- Barcelona
- Spain
| | - E. Spodine
- Centro para el Desarrollo de la Nanociencia y Nanotecnología
- Santiago
- Chile
- Facultad de Ciencias Químicas y Farmacéuticas
- Universidad de Chile
| | - N. Soto-Donoso
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago
- Chile
- Centro para el Desarrollo de la Nanociencia y Nanotecnología
| | - V. Paredes-García
- Universidad Andres Bello
- Departamento de Ciencias Químicas
- Santiago
- Chile
| | - D. Venegas-Yazigi
- Facultad de Química y Biología
- Universidad de Santiago de Chile
- Santiago
- Chile
- Centro para el Desarrollo de la Nanociencia y Nanotecnología
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28
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Vähäkangas J, Lantto P, Vaara J, Huttula M, Cao W. Orienting spins in dually doped monolayer MoS2: from one-sided to double-sided doping. Chem Commun (Camb) 2017; 53:5428-5431. [DOI: 10.1039/c7cc01560g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Single- and double-sided doped monolayer MoS2show electron spin alignments with their origins beyond explanations of the existing models.
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Affiliation(s)
| | - P. Lantto
- NMR Research Unit
- University of Oulu
- Finland
| | - J. Vaara
- NMR Research Unit
- University of Oulu
- Finland
| | - M. Huttula
- Nano and Molecular Systems Research Unit
- University of Oulu
- Finland
| | - W. Cao
- Nano and Molecular Systems Research Unit
- University of Oulu
- Finland
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