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Pointillart F, Le Guennic B, Cador O. Pressure-Induced Structural, Optical and Magnetic Modifications in Lanthanide Single-Molecule Magnets. Chemistry 2024; 30:e202400610. [PMID: 38511968 DOI: 10.1002/chem.202400610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 03/20/2024] [Accepted: 03/21/2024] [Indexed: 03/22/2024]
Abstract
Lanthanide Single-Molecule Magnets are fascinating objects that break magnetic performance records with observable magnetic bistability at the boiling temperature of liquid nitrogen, paving the way for potential applications in high-density data storage. The switching of lanthanide SMM has been successfully achieved using several external stimuli such as redox reaction, pH titration, light irradiation or solvation/desolvation thanks to the high sensitivity of the magnetic anisotropy to any structural change in the lanthanide surrounding. Nevertheless, the use of applied high pressure as an external stimulus is largely underused, especially considering that it can be combined with high pressure X-ray diffraction to establish a complementary structure-property relationship. This Concept article summarizes the few relevant examples of investigations of lanthanide SMMs under applied high pressure, provides conclusions on the effect of such stimulus on molecular structures and magnetic anisotropy, and finally draws perspective on the future development of magnetic measurements under applied pressure.
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Affiliation(s)
- 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
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2
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Song Q, Tong X, Dai P, Xie X, Xie R, Fan P, Ma Y, Chen H. Activation Mechanism of Fe 2+ in Pyrrhotite Flotation: Microflotation and DFT Calculations. Molecules 2024; 29:1490. [PMID: 38611768 PMCID: PMC11013166 DOI: 10.3390/molecules29071490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 03/22/2024] [Accepted: 03/22/2024] [Indexed: 04/14/2024] Open
Abstract
In industrial manufacturing, pyrrhotite(Fe1-xS), once depressed, is commonly activated for flotation. However, the replacement of CuSO4 is necessary due to the need for exact control over the dosage during the activation of pyrrhotite, which can pose challenges in industrial settings. This research introduces the use of FeSO4 for the first time to efficiently activate pyrrhotite. The impact of two different activators on pyrrhotite was examined through microflotation experiments and density functional theory (DFT) calculations. Microflotation experiments confirmed that as the CuSO4 dosage increased from 0 to 8 × 10-4 mol/L, the recovery of pyrrhotite initially increased slightly from 71.27% to 87.65% but then sharply decreased to 16.47%. Conversely, when the FeSO4 dosage was increased from 0 to 8 × 10-4 mol/L, pyrrhotite's recovery rose from 71.27% to 82.37%. These results indicate a higher sensitivity of CuSO4 to dosage variations, suggesting that minor alterations in dosage can significantly impact its efficacy under certain experimental conditions. In contrast, FeSO4 might demonstrate reduced sensitivity to changes in dosage, leading to more consistent performance. Fe ions can chemically adsorb onto the surface of pyrrhotite (001), creating a stable chemical bond, thereby markedly activating pyrrhotite. The addition of butyl xanthate (BX), coupled with the action of Fe2+ on activated pyrrhotite, results in the formation of four Fe-S bonds on Fe2+. The proximity of their atomic distances contributes to the development of a stable double-chelate structure. The S 3p orbital on BX hybridizes with the Fe 3d orbital on pyrrhotite, but the hybrid effect of Fe2+ activation is stronger than that of nonactivation. In addition, the Fe-S bond formed by the addition of activated Fe2+ has a higher Mulliken population, more charge overlap, and stronger covalent bonds. Therefore, Fe2+ is an excellent, efficient, and stable pyrrhotite activator.
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Affiliation(s)
| | | | | | | | | | | | | | - Hang Chen
- Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China; (Q.S.); (X.T.); (P.D.); (X.X.); (R.X.); (P.F.); (Y.M.)
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3
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Albino A, Buonocore F, Celino M, Totti F. The chimera of 2D- and 1D-graphene magnetization by hydrogenation or fluorination: critically revisiting old schemes and proposing new ones by ab initio methods. NANOSCALE ADVANCES 2024; 6:1106-1121. [PMID: 38356622 PMCID: PMC10863704 DOI: 10.1039/d3na01008b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Accepted: 01/06/2024] [Indexed: 02/16/2024]
Abstract
Graphene is an ideal candidate material for spintronics due to its layered structure and peculiar electronic structure. However, in its pristine state, the production of magnetic moments is not trivial. A very appealing approach is the chemical modification of pristine graphene. The main obstacle is the control of the geometrical features and the selectivity of functional groups. The lack of a periodic functionalization pattern of the graphene sheet prevents, therefore, the achievement of long-range magnetic order, thus limiting its use in spintronic devices. In such regards, the stability and the magnitude of the instilled magnetic moment depending on the size and shape of in silico designed graphane islands and ribbons embedded in graphene matrix will be computed and analysed. Our findings thus suggest that a novel and magneto-active graphene derivative nanostructure could become achievable more easily than extended graphone or nanoribbons, with a strong potential for future spintronics applications with a variable spin-current density.
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Affiliation(s)
- Andrea Albino
- Dipartimento di Chimica "Ugo Schiff" & INSTM RU, Università degli Studi di Firenze Via della Lastruccia 3 Sesto Fiorentino (FI) 50019 Italy
| | - Francesco Buonocore
- Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile (ENEA), Casaccia Research Centre Roma 00123 Italy
| | - Massimo Celino
- Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile (ENEA), Casaccia Research Centre Roma 00123 Italy
| | - Federico Totti
- Dipartimento di Chimica "Ugo Schiff" & INSTM RU, Università degli Studi di Firenze Via della Lastruccia 3 Sesto Fiorentino (FI) 50019 Italy
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Marcinkowski D, Kubicki M, Patroniak V, Muzioł T, Chorazy S, Shi L, Zychowicz M, Majcher-Fitas AM, Podgajny R, Gorczyński A. Trityl-Based Lanthanide-Supramolecular Assemblies Exhibiting Slow Magnetic Relaxation. Chemistry 2023; 29:e202300695. [PMID: 37408381 DOI: 10.1002/chem.202300695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 06/26/2023] [Accepted: 07/03/2023] [Indexed: 07/07/2023]
Abstract
The triphenylmethane (trityl) group has been recognized as a supramolecular synthon in crystal engineering, molecular machine rotors and stereochemical chirality inductors in materials science. Herein we demonstrate for the first time how it can be utilized in the domain of molecular magnetic materials through shaping of single molecule magnet (SMM) properties within the lanthanide complexes in tandem with other non-covalent interactions. Trityl-appended mono- (HL1 ) and bis-compartmental (HL2 ) hydrazone ligands were synthesized and complexated with Dy(III) and Er(III) triflate and nitrate salts to generate four monometallic (1-4) and two bimetallic (5, 6) complexes. The static and dynamic magnetic properties of 1-6 were investigated, revealing that only ligand HL1 induces assemblies (1-4) capable of showing SMM behaviour, with Dy(III) congeners (1, 2) able to exhibit the phenomenon also under zero field conditions. Theoretical ab initio studies helped in determination of Dy(III) energetic levels, magnetic anisotropic axes and corroborated magnetic relaxation mechanisms to be a combination of Raman and quantum tunnelling in zero dc field, the latter being cancelled in the optimum non-zero dc field. Our work represents the first study of magneto-structural correlations within the trityl Ln-SMMs, leading to generation of slowly relaxing zero-field dysprosium complexes within the hydrogen-bonded assemblies.
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Affiliation(s)
- Dawid Marcinkowski
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland
| | - Maciej Kubicki
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland
| | - Violetta Patroniak
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland
| | - Tadeusz Muzioł
- Nicolaus Copernicus University in Torun, Faculty of Chemistry, Jurija Gagarina 11, 87-100, Toruń, Poland
| | - Szymon Chorazy
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Le Shi
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Mikołaj Zychowicz
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Anna M Majcher-Fitas
- Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Łojasiewicza 11, 30-348, Kraków, Poland
| | - Robert Podgajny
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387, Kraków, Poland
| | - Adam Gorczyński
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland
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Naskar S, Mujica V, Herrmann C. Chiral-Induced Spin Selectivity and Non-equilibrium Spin Accumulation in Molecules and Interfaces: A First-Principles Study. J Phys Chem Lett 2023; 14:694-701. [PMID: 36638217 DOI: 10.1021/acs.jpclett.2c03747] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Electrons moving through chiral molecules are selected according to their spin orientation and the helicity of the molecule, an effect known as chiral-induced spin selectivity (CISS). The underlying physical mechanism is not yet completely understood. To help elucidate this mechanism, a non-equilibrium Green's function method, combined with a Landauer approach and density functional theory, is applied to carbon helices contacted by gold electrodes, resulting in spin polarization of transmitted electrons. Spin polarization is also observed in the non-equilibrium electronic structure of the junctions. While this spin polarization is small, its sign changes with the direction of the current and with the handedness of the molecule. While these calculations were performed with a pure exchange-correlation functional, previous studies suggest that computationally more expensive hybrid functionals may lead to considerably larger spin polarization in the electronic structure. Thus, non-equilibrium spin polarization could be a key component in understanding the CISS mechanism.
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Affiliation(s)
- Sumit Naskar
- Department of Chemistry, University of Hamburg, Harbor Building 610, Luruper Chaussee 149, 22761Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging, University of Hamburg, Luruper Chaussee 149, 22761Hamburg, Germany
| | - Vladimiro Mujica
- School of Molecular Sciences, Arizona State University, Tempe, Arizona85287, United States
- Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU and Donostia International Physics Center, Manuel de Lardizabal Pasealekua 3, 20018Donostia, Euskadi, Spain
| | - Carmen Herrmann
- Department of Chemistry, University of Hamburg, Harbor Building 610, Luruper Chaussee 149, 22761Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging, University of Hamburg, Luruper Chaussee 149, 22761Hamburg, Germany
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Zhang S, Zhou Y, Liang X, Wang Y, Wang T, Yang J, Lv L. Tuning the Magnetic Properties of Cr 2TiC 2T x through Surface Terminations: A Theoretical Study. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:4364. [PMID: 36558217 PMCID: PMC9781736 DOI: 10.3390/nano12244364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/11/2022] [Accepted: 12/05/2022] [Indexed: 06/17/2023]
Abstract
Recently, magnetic two-dimensional Cr2TiC2Tx MXenes with promising applications in spin electronics have been experimentally confirmed. However, the underlying magnetic mechanism needs to be further investigated. Along these lines, in this work, the magnetic properties of Cr2TiC2On/4F2-n/4 and Cr2TiC2On/4 structures were simulated through first-principle calculations using the GGA+U approach. The values of 4.1 and 3.1 eV were calculated for the Hubbard U of Cr and Ti, respectively, by applying the linear response method. Interestingly, the Cr2TiC2On/4F2-n/4-based configurations with low O content (n ≤ 4) exhibit antiferromagnetic behavior, while the majority of the respective configurations with high O content (n ≥ 5) are ferromagnetic. As far as the Cr2TiC2O5/4F3/4 structure (n = 5) is concerned, the value of about 2.64 μB was estimated for the magnetic moment of the Cr atom. On top of that, the Curie temperature lies within the range of 10~47 K. The extracted theoretical results are in good agreement with experimental outcomes of the Cr2TiC2O1.3F0.8-based structure. From the simulated results, it can be also argued that the magnetic moment of Cr atoms and the Neel temperature can be directly tuned by the active content of O atoms. The conductivity of both Cr2TiC2On/4F2-n/4 and Cr2TiC2On/4 configurations can be regulated by the externally applied magnetic field, while the density of states around the Fermi level shifted significantly between ferromagnetic and antiferromagnetic arrangements. The acquired results provide important theoretical insights to tuning the magnetic properties of Cr2TiC2Tx-based structures through surface termination mechanisms, which are quite significant for their potential applications in spin electronics.
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Affiliation(s)
- Shaozheng Zhang
- College of Teacher Education, Quzhou University, Quzhou 324000, China
| | - Yuanting Zhou
- College of Teacher Education, Quzhou University, Quzhou 324000, China
| | - Xing Liang
- College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China
| | - Yulin Wang
- College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China
| | - Tong Wang
- College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China
| | - Jianhui Yang
- College of Teacher Education, Quzhou University, Quzhou 324000, China
- College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Liang Lv
- College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China
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7
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Böhme M, Rams M, Krebs C, Mangelsen S, Jess I, Plass W, Näther C. Co(NCS) 2 Chain Compound with Alternating 5- and 6-Fold Coordination: Influence of Metal Coordination on the Magnetic Properties. Inorg Chem 2022; 61:16841-16855. [PMID: 36218356 DOI: 10.1021/acs.inorgchem.2c02813] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reaction of Co(NCS)2 with 3-bromopyridine leads to the formation of discrete complexes [Co(NCS)2(3-bromopyridine)4] (1), [Co(NCS)2(3-bromopyridine)2(H2O)2] (2), and [Co(NCS)2(3-bromopyridine)2(MeOH)2] (3) depending on the solvent. Thermogravimetric measurements on 2 and 3 show a transformation into [Co(NCS)2(3-bromopyridine)2]n (4), which upon further heating is converted to [{Co(NCS)2}2(3-bromopyridine)3]n (5), whereas 1 transforms directly into 5 upon heating. Compound 5 can also be obtained from solution, which is not possible for 4. In 4 and 5, the cobalt(II) cations are linked by pairs of μ-1,3-bridging thiocyanate anions into chains. In compound 4, all cobalt(II) cations are octahedrally coordinated (OC-6), as is usually observed in such compounds, whereas in 5, a previously unkown alternating 5- and 6-fold coordination is observed, leading to vacant octahedral (vOC-5) and octahedral (OC-6) environments, respectively. In contrast to 4, the chains in 5 are very efficiently packed and linked by π···π stacking of the pyridine rings and interchain Co···Br interactions, which is the basis for the formation of this unusual chain. The spin chains in 4 demonstrate ferromagnetic intrachain exchange and much weaker interchain interactions, as is usually observed for such linear chain compounds. In contrast, compound 5 shows almost single-ion-like magnetic susceptibility, but the magnetic ordering temperature deduced from specific heat measurements is twice as high as that in 4, which might originate from π···π stacking and Co···Br interactions between neighboring chains. More importantly, unlike all linear Co(NCS)2 chain compounds, a dominant antiferromagnetic exchange is observed for 5, which is explained by density functional theory calculations predicting an alternating ferro- and aniferromagnetic exchange within the chains. Theoretical calculations on the two different cobalt(II) ions present in 5 predict an easy-axis anisotropy that is much stronger for the octahedral cobalt(II) ion than for the one with the vacant octahedral coordination, with the magnetic axes of the two ions being canted by an angle of 84°. This almost orthogonal orientation of the easy axis of magnetization for the two cobalt(II) ions is the rationale for the observed non-Ising behavior of 5.
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Affiliation(s)
- Michael Böhme
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, Jena 07743, Germany
| | - Michał Rams
- Institute of Physics, Jagiellonian University, Łojasiewicza 11, Kraków 30348, Poland
| | - Christoph Krebs
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, Kiel 24118, Germany
| | - Sebastian Mangelsen
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, Kiel 24118, Germany
| | - Inke Jess
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, Kiel 24118, Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstraße 8, Jena 07743, Germany
| | - Christian Näther
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, Kiel 24118, Germany
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Lunghi A, Sanvito S. Computational design of magnetic molecules and their environment using quantum chemistry, machine learning and multiscale simulations. Nat Rev Chem 2022; 6:761-781. [PMID: 37118096 DOI: 10.1038/s41570-022-00424-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/15/2022] [Indexed: 11/09/2022]
Abstract
Having served as a playground for fundamental studies on the physics of d and f electrons for almost a century, magnetic molecules are now becoming increasingly important for technological applications, such as magnetic resonance, data storage, spintronics and quantum information. All of these applications require the preservation and control of spins in time, an ability hampered by the interaction with the environment, namely with other spins, conduction electrons, molecular vibrations and electromagnetic fields. Thus, the design of a novel magnetic molecule with tailored properties is a formidable task, which does not only concern its electronic structures but also calls for a deep understanding of the interaction among all the degrees of freedom at play. This Review describes how state-of-the-art ab initio computational methods, combined with data-driven approaches to materials modelling, can be integrated into a fully multiscale strategy capable of defining design rules for magnetic molecules.
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9
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Dubrovin V, Avdoshenko SM. Conformational preferences of endohedral metallofullerenes on Ag, Au, and MgO surfaces: Theoretical studies. J Comput Chem 2022; 43:1614-1620. [PMID: 35778938 DOI: 10.1002/jcc.26962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 06/12/2022] [Accepted: 06/18/2022] [Indexed: 11/09/2022]
Abstract
In this report, we study the ordering of C60 , Sc3 N@C80 , and Dy2 ScN@C80 molecules on different metallic and dielectric surfaces such as Ag(100), Au(111), and MgO(100). By using DFT techniques, we can classify different types of cage-to-surface arrangements and their relative energies. Using a proposed homogenous sampling of the conformational space for the M3 N cluster, we determine a potential energy map that is capable of providing a structural distribution for a given energy window. We find that Coulomb interaction is a dominant force that governs the system's stability and order. However, a deep analysis of the charge density rearrangements reveals that even though the integral charges may be considered as a qualitative control parameter, it fails to provide quantitative data due to the importance of spatial characteristics of charge densities.
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Affiliation(s)
- Vasilii Dubrovin
- Leibniz Institute for Solid State and Materials Research Dresden, Dresden, Germany
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10
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Briganti M, Totti F. Magnetic anisotropy on demand exploiting high-pressure as remote control: an ab initio proof of concept. Dalton Trans 2021; 50:10621-10628. [PMID: 34286784 DOI: 10.1039/d1dt01719e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Lanthanide based single molecule magnets have recently become very promising systems for creating single molecule devices working at high temperatures (nitrogen boiling temperature). However, the variation of the direction of the anisotropy tensor as a function of the applied pressure still represents a quite unexplored field. Application of external pressure can be a promising method toward neat control of magnetic anisotropy and relaxation processes in the bulk phase. Required criteria for being eligible for such systems are as follows: the presence of first excited energy levels with significantly different orientations of its anisotropy tensor; sufficiently low energies of such levels so that they can mix with the ground state; and the possibility of tuning their energies by small geometrical perturbations. The archetype compound {Na[DyDOTA(H2O)]·4H2O} (1) (H4DOTA = 1,4,7,10-tetraazacyclododecane-1,4,7,10-N,N',N'',N'''-tetraacetic acid) fulfils all such criteria. A state-of-the-art in silico proof of concept study on the possibility of controlling the orientation of the anisotropy tensor as a function of pressure in [DyDOTA(H2O)]- by inducing different apical water molecule (AWM) orientations and/or DOTA-induced crystal field is presented.
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Affiliation(s)
- Matteo Briganti
- Department of Chemistry "U. Schiff" and INSTM UdR Firenze, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Federico Totti
- Department of Chemistry "U. Schiff" and INSTM UdR Firenze, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
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11
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Magnetic Energy Landscape of Dimolybdenum Tetraacetate on a Bulk Insulator Surface. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11093806] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The magnetic states and the magnetic anisotropy barrier of a transition metal molecular complex, dimolybdenum tetraacetate, are investigated via density functional theory (DFT). Calculations are performed in the gas phase and on a calcite (10.4) bulk insulating surface, using the Generalized-Gradient Approximation (GGA)-PBE and the Hubbard-corrected DFT + U and DFT + U + V functionals. The molecular complex (denoted MoMo) contains two central metallic molybdenum atoms, embedded in a square cage of acetate groups. Recently, MoMo was observed to form locally regular networks of immobile molecules on calcite (10.4), at room conditions. As this is the first example of a metal-coordinated molecule strongly anchored to an insulator surface at room temperature, we explore here its magnetic properties with the aim to understand whether the system could be assigned features of a single molecule magnet (SMM) and could represent the basis to realize stable magnetic networks on insulators. After an introductory review on SMMs, we show that, while the uncorrected GGA-PBE functional stabilizes MoMo in a nonmagnetic state, the DFT + U and DFT + U + V approaches stabilize an antiferromagnetic ground state and several meta-stable ferromagnetic and ferrimagnetic states. Importantly, the energy landscape of magnetic states remains almost unaltered on the insulating surface. Finally, via a noncollinear magnetic formalism and a newly introduced algorithm, we calculate the magnetic anisotropy barrier, whose value indicates the stability of the molecule’s magnetic moment.
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12
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Hrubý J, Vavrečková Š, Masaryk L, Sojka A, Navarro-Giraldo J, Bartoš M, Herchel R, Moncol J, Nemec I, Neugebauer P. Deposition of Tetracoordinate Co(II) Complex with Chalcone Ligands on Graphene. Molecules 2020; 25:E5021. [PMID: 33138227 PMCID: PMC7662825 DOI: 10.3390/molecules25215021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 10/26/2020] [Accepted: 10/28/2020] [Indexed: 12/14/2022] Open
Abstract
Studying the properties of complex molecules on surfaces is still mostly an unexplored research area because the deposition of the metal complexes has many pitfalls. Herein, we probed the possibility to produce surface hybrids by depositing a Co(II)-based complex with chalcone ligands on chemical vapor deposition (CVD)-grown graphene by a wet-chemistry approach and by thermal sublimation under high vacuum. Samples were characterized by high-frequency electron spin resonance (HF-ESR), XPS, Raman spectroscopy, atomic force microscopy (AFM), and optical microscopy, supported with density functional theory (DFT) and complete active space self-consistent field (CASSCF)/N-electron valence second-order perturbation theory (NEVPT2) calculations. This compound's rationale is its structure, with several aromatic rings for weak binding and possible favorable π-π stacking onto graphene. In contrast to expectations, we observed the formation of nanodroplets on graphene for a drop-cast sample and microcrystallites localized at grain boundaries and defects after thermal sublimation.
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Affiliation(s)
- Jakub Hrubý
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic; (J.H.); (S.V.); (A.S.); (J.N.-G.); (M.B.); (I.N.)
| | - Šárka Vavrečková
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic; (J.H.); (S.V.); (A.S.); (J.N.-G.); (M.B.); (I.N.)
- Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 61669 Brno, Czech Republic
| | - Lukáš Masaryk
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 77147 Olomouc, Czech Republic; (L.M.); (R.H.)
| | - Antonín Sojka
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic; (J.H.); (S.V.); (A.S.); (J.N.-G.); (M.B.); (I.N.)
| | - Jorge Navarro-Giraldo
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic; (J.H.); (S.V.); (A.S.); (J.N.-G.); (M.B.); (I.N.)
| | - Miroslav Bartoš
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic; (J.H.); (S.V.); (A.S.); (J.N.-G.); (M.B.); (I.N.)
| | - Radovan Herchel
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 77147 Olomouc, Czech Republic; (L.M.); (R.H.)
| | - Ján Moncol
- Department of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, 81237 Bratislava, Slovakia;
| | - Ivan Nemec
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic; (J.H.); (S.V.); (A.S.); (J.N.-G.); (M.B.); (I.N.)
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, 77147 Olomouc, Czech Republic; (L.M.); (R.H.)
| | - Petr Neugebauer
- Central European Institute of Technology, CEITEC BUT, Purkyňova 656/123, 61200 Brno, Czech Republic; (J.H.); (S.V.); (A.S.); (J.N.-G.); (M.B.); (I.N.)
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13
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Alexandru M, Visinescu D, Madalan AM, Clérac R, Andruh M. Structure and Magnetic Properties of an Original {Cu
II
Mn
II
W
V
} Heterotrimetallic Coordination Polymer. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Maria‐Gabriela Alexandru
- Department of Inorganic Chemistry Physical Chemistry and Electrochemistry University Politehnica of Bucharest 1‐7 Gh. Polizu Street 01106 Bucharest Romania
| | - Diana Visinescu
- Coordination and Supramolecular Chemistry Laboratory “Ilie Murgulescu” Institute of Physical Chemistry Romanian Academy Splaiul Independentei 202 ‐060021 Bucharest Romania
| | - Augustin M. Madalan
- Inorganic Chemistry Laboratory Faculty of Chemistry University of Bucharest Str. Dumbrava Rosie 23 020464‐ Bucharest Romania
| | - Rodolphe Clérac
- Centre de Recherche Paul Pascal, UMR 5031 Univ. Bordeaux, CNRS 33600 Pessac France
| | - Marius Andruh
- Inorganic Chemistry Laboratory Faculty of Chemistry University of Bucharest Str. Dumbrava Rosie 23 020464‐ Bucharest Romania
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14
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Serrano G, Poggini L, Briganti M, Sorrentino AL, Cucinotta G, Malavolti L, Cortigiani B, Otero E, Sainctavit P, Loth S, Parenti F, Barra AL, Vindigni A, Cornia A, Totti F, Mannini M, Sessoli R. Quantum dynamics of a single molecule magnet on superconducting Pb(111). NATURE MATERIALS 2020; 19:546-551. [PMID: 32066930 DOI: 10.1038/s41563-020-0608-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
Magnetic materials interfaced with superconductors may reveal new physical phenomena with potential for quantum technologies. The use of molecules as magnetic components has already shown great promise, but the diversity of properties offered by the molecular realm remains largely unexplored. Here we investigate a submonolayer of tetrairon(III) propeller-shaped single molecule magnets deposited on a superconducting lead surface. This material combination reveals a strong influence of the superconductor on the spin dynamics of the single molecule magnet. It is shown that the superconducting transition to the condensate state switches the single molecule magnet from a blocked magnetization state to a resonant quantum tunnelling regime. Our results open perspectives to control single molecule magnetism via superconductors and to use single molecule magnets as local probes of the superconducting state.
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Affiliation(s)
- Giulia Serrano
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy.
- Department of Industrial Engineering and INSTM Research Unit, University of Florence, Florence, Italy.
| | - Lorenzo Poggini
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy
| | - Matteo Briganti
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy
- Departamento de Química, Universidade Federal do Paraná, Curitiba, Brazil
| | - Andrea Luigi Sorrentino
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy
- Department of Industrial Engineering and INSTM Research Unit, University of Florence, Florence, Italy
| | - Giuseppe Cucinotta
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy
| | - Luigi Malavolti
- Institute FMQ, University of Stuttgart & Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Brunetto Cortigiani
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin, France
| | - Philippe Sainctavit
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin, France
- IMPMC, UMR7590 CNRS, Sorbonne Université, MNHN, Paris, France
| | - Sebastian Loth
- Institute FMQ, University of Stuttgart & Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - Francesca Parenti
- Department of Chemical and Geological Sciences and INSTM Research Unit, University of Modena and Reggio Emilia, Modena, Italy
| | | | | | - Andrea Cornia
- Department of Chemical and Geological Sciences and INSTM Research Unit, University of Modena and Reggio Emilia, Modena, Italy
| | - Federico Totti
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy
| | - Matteo Mannini
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy
| | - Roberta Sessoli
- Department of Chemistry 'Ugo Schiff' and INSTM Research Unit, University of Florence, Sesto Fiorentino, Italy.
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15
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Nabi R, Rajaraman G. Deciphering the origin of variation in the spin ground state and oxidation state of a {Mn 19} cluster on a Au(111) surface: is the Au(111) surface innocent? Chem Commun (Camb) 2019; 55:8238-8241. [PMID: 31250845 DOI: 10.1039/c9cc03714d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Periodic DFT calculations on a {Mn19} cluster possessing S = 83/2 ground state and its reduced variant on a Au(111) surface unravel the importance of structural distortions that triggered drastic variations in the J values leading to a large reduction in the spin ground state. Reduction of MnIII ions leads to antiferromagnetic Js with a very small spin ground state manifesting the non-innocent behavior of the Au(111) surface.
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Affiliation(s)
- Rizwan Nabi
- 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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16
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Neumann T, Rams M, Tomkowicz Z, Jess I, Näther C. Tuning of the exchange interaction and the Curie temperature by mixed crystal formation of the bridging anionic ligands. Chem Commun (Camb) 2019; 55:2652-2655. [PMID: 30742155 DOI: 10.1039/c8cc09392j] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mixed crystals with the composition [Co(NCS)x(NCSe)2-x(pyridine)2]n were prepared from solution and by annealing of Co(NCS)x(NCSe)2-x(pyridine)4. With increasing selenocyanate content, an increase of the magnetic exchange constant and of the critical temperature (Curie temperature) is observed, which offers a rational route to control these parameters in detail, without changing the metal cations.
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Affiliation(s)
- Tristan Neumann
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Str. 2, 24118, Kiel, Germany.
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17
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Jochim A, Jess I, Näther C. Zn(NCS)2
-3-cyanopyridine Coordination Compounds: Synthesis, Crystal Structures, and Thermal Properties. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800428] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Aleksej Jochim
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Straße 2 24118 Kiel Germany
| | - Inke Jess
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Straße 2 24118 Kiel Germany
| | - Christian Näther
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Straße 2 24118 Kiel Germany
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18
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Avdoshenko SM. Fullerene faraday cage keeps magnetic properties of inner cluster pristine. J Comput Chem 2018; 39:1594-1598. [PMID: 29681135 DOI: 10.1002/jcc.25231] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 03/27/2018] [Accepted: 04/03/2018] [Indexed: 11/08/2022]
Abstract
Any single molecular magnets (SMMs) perspective for application is as good as its magnetization stability in ambient conditions. Endohedral metallofullerenes (EMFs) provide a solid basis for promising SMMs. In this study, we investigated the behavior of functionalized EMFs on a gold surface (EMF-L-Au). Having followed the systems molecular dynamics paths, we observed that the chemically locked inner cluster inside fullerene cage will remain locked even at room temperature due to the ligand-effect. We have located multiple possible minima with different charge arrangements between EMF-L-Au fragments. Remarkably, the charge state of the EMF inner cluster remained virtually constant and so magnetic properties are expected to be untouched. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Stanislav M Avdoshenko
- Leibniz Institute for Solid State and Materials Research Dresden, Helmholtzstraße 20, 01069, Dresden
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19
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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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20
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Neumann T, Ceglarska M, Germann LS, Rams M, Dinnebier RE, Suckert S, Jess I, Näther C. Structures, Thermodynamic Relations, and Magnetism of Stable and Metastable Ni(NCS) 2 Coordination Polymers. Inorg Chem 2018; 57:3305-3314. [PMID: 29505252 DOI: 10.1021/acs.inorgchem.8b00092] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reaction of Ni(NCS)2 with 4-aminopyridine in different solvents leads to the formation of compounds with the compositions Ni(NCS)2(4-aminopyridine)4 (1), Ni(NCS)2(4-aminopyridine)2(H2O)2 (2), [Ni(NCS)2(4-aminopyridine)3(MeCN)]·MeCN (3), and [Ni(NCS)2(4-aminopyridine)2] n (5-LT). Compounds 1, 2, and 3 form discrete complexes, with octahedral metal coordination. In 5-LT the Ni cations are linked by single thiocyanate anions into chains, which are further connected into layers by half of the 4-aminopyridine coligands. Upon heating, 1 transforms into an isomer of 5-LT with a 1D structure (5-HT), that on further heating forms a more condensed chain compound [Ni(NCS)2(4-aminopyridine)] n (6) that shows a very unusual chain topology. If 3 is heated, a further compound with the composition Ni(NCS)2(4-aminopyridine)3 (4) is formed, which presumably is a dimer and which on further heating transforms into 6 via 5-HT as intermediate. Further investigations reveal that 5-LT and 5-HT are related by enantiotropism, with 5-LT being the thermodynamic stable form at room-temperature. Magnetic and specific heat measurements reveal ferromagnetic exchange through thiocyanate bridges and magnetic ordering due to antiferromagnetic interchain interactions at 5.30(5) K and 8.2(2) K for 5-LT and 6, respectively. Consecutive metamagnetic transitions in the spin ladder compound 6 are due to dipolar interchain interactions. A convenient formula for susceptibility of the ferromagnetic Heisenberg chain of isotropic spins S = 1 is proposed, based on numerical DMRG calculations, and used to determine exchange constants.
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Affiliation(s)
- Tristan Neumann
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2 , 24118 Kiel , Germany
| | - Magdalena Ceglarska
- Institute of Physics, Jagiellonian University , Łojasiewicza 11 , 30348 Kraków , Poland
| | - Luzia S Germann
- Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Michał Rams
- Institute of Physics, Jagiellonian University , Łojasiewicza 11 , 30348 Kraków , Poland
| | - Robert E Dinnebier
- Max Planck Institute for Solid State Research , Heisenbergstraße 1 , 70569 Stuttgart , Germany
| | - Stefan Suckert
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2 , 24118 Kiel , Germany
| | - Inke Jess
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2 , 24118 Kiel , Germany
| | - Christian Näther
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2 , 24118 Kiel , Germany
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21
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Fernandez Garcia G, Lunghi A, Totti F, Sessoli R. The disclosure of mesoscale behaviour of a 3d-SMM monolayer on Au(111) through a multilevel approach. NANOSCALE 2018; 10:4096-4104. [PMID: 29431791 DOI: 10.1039/c7nr06320b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Here we present a computational study of a full- and a half-monolayer of a Fe4 single molecule magnet ([Fe4(L)2(dpm)6], where H3L = 2-hydroxymethyl-2-phenylpropane-1,3-diol and Hdpm = dipivaloylmethane, Fe4Ph) on an unreconstructed surface of Au(111). This has been possible through the application of an integrated approach, which allows the explicit inclusion of the packing effects in the classical dynamics to be used in a second step in periodic and non-periodic high level DFT calculations. In this way we can obtain access to mesoscale geometrical data and verify how they can influence the magnetic properties of interest of the single Fe4 molecule. The proposed approach allows to overcome the ab initio state-of-the-art approaches used to study Single Molecule Magnets (SMMs), which are based on the study of one single adsorbed molecule and cannot represent effects on the scale of a monolayer. Indeed, we show here that it is possible to go beyond the computational limitations inherent to the use, for such complex systems, of accurate calculation techniques (e.g. ab initio molecular dynamics) without losing the level of accuracy necessary to gain new detailed insights, hardly reachable at the experimental level. Indeed, long-range and edge effects on the Fe4 structures and their easy axis of magnetization orientations have been evidenced as their different contributions to the overall macroscopic behavior.
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Affiliation(s)
- Guglielmo Fernandez Garcia
- Università degli Studi di Firenze. Dipartimento di Chimica "Ugo Schiff", Via della Lastruccia 3-13, 50019, Sesto Fiorentino, FI, Italy.
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22
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Mössbauer spectroscopy of a monolayer of single molecule magnets. Nat Commun 2018; 9:480. [PMID: 29396458 PMCID: PMC5797240 DOI: 10.1038/s41467-018-02840-w] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 01/03/2018] [Indexed: 11/30/2022] Open
Abstract
The use of single molecule magnets (SMMs) as cornerstone elements in spintronics and quantum computing applications demands that magnetic bistability is retained when molecules are interfaced with solid conducting surfaces. Here, we employ synchrotron Mössbauer spectroscopy to investigate a monolayer of a tetrairon(III) (Fe4) SMM chemically grafted on a gold substrate. At low temperature and zero magnetic field, we observe the magnetic pattern of the Fe4 molecule, indicating slow spin fluctuations compared to the Mössbauer timescale. Significant structural deformations of the magnetic core, induced by the interaction with the substrate, as predicted by ab initio molecular dynamics, are also observed. However, the effects of the modifications occurring at the individual iron sites partially compensate each other, so that slow magnetic relaxation is retained on the surface. Interestingly, these deformations escaped detection by conventional synchrotron-based techniques, like X-ray magnetic circular dichroism, thus highlighting the power of synchrotron Mössbauer spectroscopy for the investigation of hybrid interfaces. Deposition of single molecule magnets onto surfaces is a key step for integration in devices exploiting their magnetic bistability and quantum properties. Here, Sessoli and colleagues exploit synchrotron Mössbauer spectroscopy to assess the effects of molecule-surface interactions on the magnetic properties of Fe(III) SMMs.
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23
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Gupta T, Rajaraman G. Modelling spin Hamiltonian parameters of molecular nanomagnets. Chem Commun (Camb) 2018; 52:8972-9008. [PMID: 27366794 DOI: 10.1039/c6cc01251e] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular nanomagnets encompass a wide range of coordination complexes possessing several potential applications. A formidable challenge in realizing these potential applications lies in controlling the magnetic properties of these clusters. Microscopic spin Hamiltonian (SH) parameters describe the magnetic properties of these clusters, and viable ways to control these SH parameters are highly desirable. Computational tools play a proactive role in this area, where SH parameters such as isotropic exchange interaction (J), anisotropic exchange interaction (Jx, Jy, Jz), double exchange interaction (B), zero-field splitting parameters (D, E) and g-tensors can be computed reliably using X-ray structures. In this feature article, we have attempted to provide a holistic view of the modelling of these SH parameters of molecular magnets. The determination of J includes various class of molecules, from di- and polynuclear Mn complexes to the {3d-Gd}, {Gd-Gd} and {Gd-2p} class of complexes. The estimation of anisotropic exchange coupling includes the exchange between an isotropic metal ion and an orbitally degenerate 3d/4d/5d metal ion. The double-exchange section contains some illustrative examples of mixed valance systems, and the section on the estimation of zfs parameters covers some mononuclear transition metal complexes possessing very large axial zfs parameters. The section on the computation of g-anisotropy exclusively covers studies on mononuclear Dy(III) and Er(III) single-ion magnets. The examples depicted in this article clearly illustrate that computational tools not only aid in interpreting and rationalizing the observed magnetic properties but possess the potential to predict new generation MNMs.
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Affiliation(s)
- Tulika Gupta
- Department of Chemistry, IIT Powai, Mumbai-400076, India.
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24
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Gorczyński A, Marcinkowski D, Kubicki M, Löffler M, Korabik M, Karbowiak M, Wiśniewski P, Rudowicz C, Patroniak V. New field-induced single ion magnets based on prolate Er(iii) and Yb(iii) ions: tuning the energy barrierUeffby the choice of counterions within an N3-tridentate Schiff-base scaffold. Inorg Chem Front 2018. [DOI: 10.1039/c7qi00727b] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Counterions modulate the structure and magnetic properties of rarely observed high-coordinate SIM species.
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Affiliation(s)
- Adam Gorczyński
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
| | | | - Maciej Kubicki
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
| | - Marta Löffler
- Faculty of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | - Maria Korabik
- Faculty of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | | | - Piotr Wiśniewski
- Institute of Low Temperature and Structure Research
- Polish Academy of Sciences
- 50-422 Wrocław
- Poland
| | - Czesław Rudowicz
- Faculty of Chemistry
- Adam Mickiewicz University
- 61-614 Poznań
- Poland
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25
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Barone V, Cacelli I, Ferretti A. The role of the multiconfigurational character of nitronyl-nitroxide in the singlet–triplet energy gap of its diradicals. Phys Chem Chem Phys 2018; 20:18547-18555. [DOI: 10.1039/c8cp02165a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
CAS(2,2) reference may not be sufficient for the computation of singlet–triplet energy gap by DDCI.
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Affiliation(s)
| | - Ivo Cacelli
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- Pisa
- Italy
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
| | - Alessandro Ferretti
- Istituto di Chimica dei Composti OrganoMetallici (ICCOM-CNR)
- Area della Ricerca
- I-56124 Pisa
- Italy
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26
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Neumann T, Germann LS, Moudrakovski I, Dinnebier RE, dos Santos Cunha C, Terraschke H, Näther C. Synthesis, Crystal Structures, and Properties of M
(NCS)2
-3-aminomethylpyridine Coordination Compounds (M
= Cd, Zn). Z Anorg Allg Chem 2017. [DOI: 10.1002/zaac.201700250] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tristan Neumann
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Strasse 2 24118 Kiel Germany
| | - Luzia S. Germann
- Max Planck Institute for Solid State Research; Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Igor Moudrakovski
- Max Planck Institute for Solid State Research; Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Robert E. Dinnebier
- Max Planck Institute for Solid State Research; Heisenbergstrasse 1 70569 Stuttgart Germany
| | - Cesar dos Santos Cunha
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Strasse 2 24118 Kiel Germany
| | - Huayna Terraschke
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Strasse 2 24118 Kiel Germany
| | - Christian Näther
- Institute of Inorganic Chemistry; Christian-Albrechts-University of Kiel; Max-Eyth-Strasse 2 24118 Kiel Germany
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27
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Kocak C, Oylumluoglu G, Donmez A, Coban MB, Erkarslan U, Aygun M, Kara H. Crystal structure and photoluminescence properties of a new monomeric copper(II) complex: bis(3-{[(3-hydroxypropyl)imino]methyl}-4-nitrophenolato-κ 3O,N,O')copper(II). ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2017; 73:414-419. [PMID: 28469068 DOI: 10.1107/s2053229617005976] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 04/20/2017] [Indexed: 11/10/2022]
Abstract
Copper(II)-Schiff base complexes have attracted extensive interest due to their structural, electronic, magnetic and luminescence properties. The title novel monomeric CuII complex, [Cu(C10H11N2O4)2], has been synthesized by the reaction of 3-{[(3-hydroxypropyl)imino]methyl}-4-nitrophenol (H2L) and copper(II) acetate monohydrate in methanol, and was characterized by elemental analysis, UV and IR spectroscopies, single-crystal X-ray diffraction analysis and a photoluminescence study. The CuII atom is located on a centre of inversion and is coordinated by two imine N atoms, two phenoxy O atoms in a mutual trans disposition and two hydroxy O atoms in axial positions, forming an elongated octahedral geometry. In the crystal, intermolecular O-H...O hydrogen bonds link the molecules to form a one-dimensional chain structure and π-π contacts also connect the molecules to form a three-dimensional structure. The solid-state photoluminescence properties of the complex and free H2L have been investigated at room temperature in the visible region. When the complex and H2L are excited under UV light at 349 nm, the complex displays a strong green emission at 520 nm and H2L displays a blue emission at 480 nm.
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Affiliation(s)
- Cagdas Kocak
- Department of Physics, Molecular Nano-Materials Laboratory, Mugla Sitki Kocman University, Mugla, Turkey
| | - Gorkem Oylumluoglu
- Department of Physics, Molecular Nano-Materials Laboratory, Mugla Sitki Kocman University, Mugla, Turkey
| | - Adem Donmez
- Department of Physics, Molecular Nano-Materials Laboratory, Mugla Sitki Kocman University, Mugla, Turkey
| | - M Burak Coban
- Department of Physics, Balikesir University, Balikesir, Turkey
| | - Ugur Erkarslan
- Department of Physics, Molecular Nano-Materials Laboratory, Mugla Sitki Kocman University, Mugla, Turkey
| | - Muhittin Aygun
- Department of Physics, 9 Eylul University, Izmir, Turkey
| | - Hulya Kara
- Department of Physics, Molecular Nano-Materials Laboratory, Mugla Sitki Kocman University, Mugla, Turkey
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28
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Rudowicz C, Tadyszak K. Single magnetic 3dN adatoms on surfaces – Proper outlook on compatibility of orthorhombic zero-field splitting parameters and their relationships with magnetic anisotropy quantities. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.01.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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29
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Molecular magnetism, quo vadis? A historical perspective from a coordination chemist viewpoint☆. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.004] [Citation(s) in RCA: 240] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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30
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Barone V, Cacelli I, Ferretti A, Prampolini G. Magnetic gaps in organic tri-radicals: From a simple model to accurate estimates. J Chem Phys 2017; 146:104103. [DOI: 10.1063/1.4977598] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Rams M, Böhme M, Kataev V, Krupskaya Y, Büchner B, Plass W, Neumann T, Tomkowicz Z, Näther C. Static and dynamic magnetic properties of the ferromagnetic coordination polymer [Co(NCS)2(py)2]n. Phys Chem Chem Phys 2017; 19:24534-24544. [PMID: 28852749 DOI: 10.1039/c7cp04189f] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The static and dynamic properties of the Ising like chain ferromagnet are studied by magnetic measurements and high field-high frequency ESR spectroscopy.
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Affiliation(s)
- Michał Rams
- Institute of Physics
- Jagiellonian University
- 30-348 Krakow
- Poland
| | - Michael Böhme
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Vladislav Kataev
- Leibnitz Institute for Solid State and Materials Research
- IFW Dresden
- 01069 Dresden
- Germany
| | - Yulia Krupskaya
- Leibnitz Institute for Solid State and Materials Research
- IFW Dresden
- 01069 Dresden
- Germany
| | - Bernd Büchner
- Leibnitz Institute for Solid State and Materials Research
- IFW Dresden
- 01069 Dresden
- Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Tristan Neumann
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
- Germany
| | | | - Christian Näther
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
- Germany
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32
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Rams M, Tomkowicz Z, Böhme M, Plass W, Suckert S, Werner J, Jess I, Näther C. Influence of metal coordination and co-ligands on the magnetic properties of 1D Co(NCS)2 coordination polymers. Phys Chem Chem Phys 2017; 19:3232-3243. [DOI: 10.1039/c6cp08193b] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two 1D Co(NCS)2 coordination polymers were synthesized and their magnetic properties were investigated by susceptibility and specific heat measurements as well as DFT and ab initio calculations.
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Affiliation(s)
- Michał Rams
- Institute of Physics
- Jagiellonian University
- Łojasiewicza 11
- 30-348 Kraków
- Poland
| | - Zbigniew Tomkowicz
- Institute of Physics
- Jagiellonian University
- Łojasiewicza 11
- 30-348 Kraków
- Poland
| | - Michael Böhme
- Institut für Anorganische und Analytische Chemie
- Universität Jena
- Humboldtstr. 8
- 07743 Jena
- Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie
- Universität Jena
- Humboldtstr. 8
- 07743 Jena
- Germany
| | - Stefan Suckert
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- Max-Eyth-Straße 2
- 24118 Kiel
- Germany
| | - Julia Werner
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- Max-Eyth-Straße 2
- 24118 Kiel
- Germany
| | - Inke Jess
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- Max-Eyth-Straße 2
- 24118 Kiel
- Germany
| | - Christian Näther
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- Max-Eyth-Straße 2
- 24118 Kiel
- Germany
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33
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Reis SG, Briganti M, Soriano S, Guedes GP, Calancea S, Tiseanu C, Novak MA, del Águila-Sánchez MA, Totti F, Lopez-Ortiz F, Andruh M, Vaz MGF. Binuclear Lanthanide-Radical Complexes Featuring Two Centers with Different Magnetic and Luminescence Properties. Inorg Chem 2016; 55:11676-11684. [DOI: 10.1021/acs.inorgchem.6b01616] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Samira G. Reis
- Universidade Federal Fluminense, Instituto de Quı́mica, 24020-150, Niterói, Rio de Janeiro, Brazil
| | - Matteo Briganti
- Universidade Federal Fluminense, Instituto de Quı́mica, 24020-150, Niterói, Rio de Janeiro, Brazil
- Università degli Studi di Firenze, via della Lastruccia 3, 50019, Sesto Fiorentino, Firenze, Italy
| | - Stéphane Soriano
- Universidade Federal Fluminense, Instituto de Fı́sica, 24210-346, Niterói, Rio
de Janeiro, Brazil
- Consiglio Nazionale delle Ricerche − Istituto di Chimica dei Composti Organo-Metallici, via Madonna del Piano 10, 50019, Sesto Fiorentino, Firenze, Italy
| | - Guilherme P. Guedes
- Universidade Federal Rural do Rio de Janeiro, Departamento de Química, 23870-000, Seropédica, Rio de Janeiro, Brazil
| | - Sergiu Calancea
- Universidade Federal Fluminense, Instituto de Quı́mica, 24020-150, Niterói, Rio de Janeiro, Brazil
| | - Carmen Tiseanu
- National Institute for Laser, Plasma and Radiation, Str. Atomistilor 409, 077125-Magurele, Romania
| | - Miguel A. Novak
- Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro, 21941-972, Rio de Janeiro, Brazil
| | | | - Federico Totti
- Università degli Studi di Firenze, via della Lastruccia 3, 50019, Sesto Fiorentino, Firenze, Italy
| | - Fernando Lopez-Ortiz
- Área de Química
Orgánica, Universidad de Almería, Crta. Sacramento s/n, 04120, Almería, Spain
| | - Marius Andruh
- Inorganic Chemistry Laboratory, Faculty of Chemistry, University of Bucharest, 020464, Bucharest, Romania
| | - Maria G. F. Vaz
- Universidade Federal Fluminense, Instituto de Quı́mica, 24020-150, Niterói, Rio de Janeiro, Brazil
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34
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Kiefl E, Mannini M, Bernot K, Yi X, Amato A, Leviant T, Magnani A, Prokscha T, Suter A, Sessoli R, Salman Z. Robust Magnetic Properties of a Sublimable Single-Molecule Magnet. ACS NANO 2016; 10:5663-5669. [PMID: 27139335 DOI: 10.1021/acsnano.6b01817] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The organization of single-molecule magnets (SMMs) on surfaces via thermal sublimation is a prerequisite for the development of future devices for spintronics exploiting the richness of properties offered by these magnetic molecules. However, a change in the SMM properties due to the interaction with specific surfaces is usually observed. Here we present a rare example of an SMM system that can be thermally sublimated on gold surfaces while maintaining its intact chemical structure and magnetic properties. Muon spin relaxation and ac susceptibility measurements are used to demonstrate that, unlike other SMMs, the magnetic properties of this system in thin films are very similar to those in the bulk, throughout the full volume of the film, including regions near the metal and vacuum interfaces. These results exhibit the robustness of chemical and magnetic properties of this complex and provide important clues for the development of nanostructures based on SMMs.
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Affiliation(s)
- Evan Kiefl
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Matteo Mannini
- Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU Firenze , Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Kevin Bernot
- INSA, ISCR, UMR 6226, F-35708 RENNES , 20 Avenue des Buttes de Coësmes CS70839, 35708 Rennes Cedex, France
| | - Xiaohui Yi
- INSA, ISCR, UMR 6226, F-35708 RENNES , 20 Avenue des Buttes de Coësmes CS70839, 35708 Rennes Cedex, France
| | - Alex Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Tom Leviant
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
- Department of Physics, Technion - Israel Institute of Technology , Haifa 32000, Israel
| | - Agnese Magnani
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena & INSTM RU Siena , Via A. Moro, 2 53100 Siena, Italy
| | - Thomas Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Andreas Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Roberta Sessoli
- Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU Firenze , Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Zaher Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
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35
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Synthesis, Structures and Properties of Cobalt Thiocyanate Coordination Compounds with 4-(hydroxymethyl)pyridine as Co-ligand. CRYSTALS 2016. [DOI: 10.3390/cryst6040038] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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36
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Suckert S, Rams M, Böhme M, Germann LS, Dinnebier RE, Plass W, Werner J, Näther C. Synthesis, structures, magnetic, and theoretical investigations of layered Co and Ni thiocyanate coordination polymers. Dalton Trans 2016; 45:18190-18201. [DOI: 10.1039/c6dt03752f] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new ferromagnetic layered Co(ii) and Ni(ii) thiocyanate coordination polymers were synthesized, structurally characterized and investigated for their magnetic behavior using susceptibility measurements and theoretical methods.
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Affiliation(s)
- Stefan Suckert
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
- Germany
| | - Michał Rams
- Institute of Physics
- Jagiellonian University
- 30-348 Krakow
- Poland
| | - Michael Böhme
- Institut für Anorganische und Analytische Chemie
- Universität Jena
- 07743 Jena
- Germany
| | - Luzia S. Germann
- Max Planck Institute for Solid State Research
- 70569 Stuttgart
- Germany
| | | | - Winfried Plass
- Institut für Anorganische und Analytische Chemie
- Universität Jena
- 07743 Jena
- Germany
| | - Julia Werner
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
- Germany
| | - Christian Näther
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität zu Kiel
- 24118 Kiel
- Germany
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37
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Gallego-Planas N, Martín-Rodríguez A, Ruiz E. Magnetic and transport properties of Fe4single-molecule magnets: a theoretical insight. Dalton Trans 2016; 45:18867-18875. [DOI: 10.1039/c6dt03460h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
DFT methods have been employed to analyse the magnetic and transport properties of a family of Fe4complexes showing single-molecule magnet behaviour deposited on gold surfaces.
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Affiliation(s)
- Nuria Gallego-Planas
- Ingénierie Moléculaire et Matériaux Organiques
- UMR 6501
- Boulevard Lavoisier
- Université d'Angers
- F-49045 Angers
| | - Alejandro Martín-Rodríguez
- Departament de Química Inorgànica i Orgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica i Orgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
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38
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Magnetic fingerprint of individual Fe4 molecular magnets under compression by a scanning tunnelling microscope. Nat Commun 2015; 6:8216. [PMID: 26359203 PMCID: PMC4579601 DOI: 10.1038/ncomms9216] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 07/30/2015] [Indexed: 11/25/2022] Open
Abstract
Single-molecule magnets (SMMs) present a promising avenue to develop spintronic technologies. Addressing individual molecules with electrical leads in SMM-based spintronic devices remains a ubiquitous challenge: interactions with metallic electrodes can drastically modify the SMM's properties by charge transfer or through changes in the molecular structure. Here, we probe electrical transport through individual Fe4 SMMs using a scanning tunnelling microscope at 0.5 K. Correlation of topographic and spectroscopic information permits identification of the spin excitation fingerprint of intact Fe4 molecules. Building from this, we find that the exchange coupling strength within the molecule's magnetic core is significantly enhanced. First-principles calculations support the conclusion that this is the result of confinement of the molecule in the two-contact junction formed by the microscope tip and the sample surface. The incorporation of single-molecule magnets into spintronic devices is often hindered by electronic or structural modifications. Here, the authors demonstrate how confinement of Fe4 molecules in junctions between a Cu2N substrate and a scanning microscope tip enhances intra-molecular exchange interaction.
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