1
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Sorrentino AL, Poggini L, Serrano G, Cucinotta G, Cortigiani B, Malavolti L, Parenti F, Otero E, Arrio MA, Sainctavit P, Caneschi A, Cornia A, Sessoli R, Mannini M. Assembling Fe 4 single-molecule magnets on a TiO 2 monolayer. NANOSCALE 2024. [PMID: 38993100 DOI: 10.1039/d4nr02234c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/13/2024]
Abstract
The decoration of technologically relevant surfaces, such as metal oxides, with Single-Molecule Magnets (SMMs) constitutes a persistent challenge for the integration of these molecular systems into novel technologies and, in particular, for the development of spintronic and quantum devices. We used UHV thermal sublimation to deposit tetrairon(III) propeller-shaped SMMs (Fe4) as a single layer on a TiO2 ultrathin film grown on Cu(001). The properties of the molecular deposit were studied using a multi-technique approach based on standard topographic and spectroscopic measurements, which demonstrated that molecules remain largely intact upon deposition. Ultralow temperature X-ray Absorption Spectroscopy (XAS) with linearly and circularly polarized light was further employed to evaluate both the molecular organization and the magnetic properties of the Fe4 monolayer. X-ray Natural Linear Dichroism (XNLD) and X-ray Magnetic Circular Dichroism (XMCD) showed that molecules in a monolayer display a preferential orientation and an open magnetic hysteresis with pronounced quantum tunnelling steps up to 900 mK. However, unexpected extra features in the XAS and XMCD spectra disclosed a minority fraction of altered molecules, suggesting that the TiO2 film may be chemically non-innocent. The observed persistence of SMM behaviour on a metal oxide thin film opens new possibilities for the development of SMM-based hybrid systems.
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Affiliation(s)
- Andrea Luigi Sorrentino
- Department of Industrial Engineering - DIEF - and INSTM Research Unit, University of Florence, Via Santa Marta 3, 50139 Florence, Italy
- Department of Chemistry "U. Schiff" - DICUS - and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, FI, Italy.
| | - Lorenzo Poggini
- Department of Chemistry "U. Schiff" - DICUS - and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, FI, Italy.
- Institute for Chemistry of Organo-Metallic Compounds (ICCOM-CNR), Via Madonna del Piano, 50019 Sesto Fiorentino, FI, Italy
| | - Giulia Serrano
- Department of Industrial Engineering - DIEF - and INSTM Research Unit, University of Florence, Via Santa Marta 3, 50139 Florence, Italy
- Department of Chemistry "U. Schiff" - DICUS - and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, FI, Italy.
| | - Giuseppe Cucinotta
- Department of Chemistry "U. Schiff" - DICUS - and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, FI, Italy.
| | - Brunetto Cortigiani
- Department of Chemistry "U. Schiff" - DICUS - and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, FI, Italy.
| | - Luigi Malavolti
- Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
| | - Francesca Parenti
- Department of Chemical and Geological Sciences and INSTM Research Unit, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
| | - Edwige Otero
- Synchrotron-SOLEIL, L'Orme des Merisiers, 91192 Saint-Aubin, France
| | - Marie-Anne Arrio
- CNRS UMR7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université/MNHN, 4 place Jussieu, 75252 Paris Cedex 5, France
| | - Philippe Sainctavit
- Synchrotron-SOLEIL, L'Orme des Merisiers, 91192 Saint-Aubin, France
- CNRS UMR7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université/MNHN, 4 place Jussieu, 75252 Paris Cedex 5, France
| | - Andrea Caneschi
- Department of Industrial Engineering - DIEF - and INSTM Research Unit, University of Florence, Via Santa Marta 3, 50139 Florence, Italy
| | - Andrea Cornia
- Department of Chemical and Geological Sciences and INSTM Research Unit, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
| | - Roberta Sessoli
- Department of Chemistry "U. Schiff" - DICUS - and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, FI, Italy.
- Institute for Chemistry of Organo-Metallic Compounds (ICCOM-CNR), Via Madonna del Piano, 50019 Sesto Fiorentino, FI, Italy
| | - Matteo Mannini
- Department of Chemistry "U. Schiff" - DICUS - and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, FI, Italy.
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2
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Hu Z, Yang S. Endohedral metallofullerene molecular nanomagnets. Chem Soc Rev 2024; 53:2863-2897. [PMID: 38324027 DOI: 10.1039/d3cs00991b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
Magnetic lanthanide (Ln) metal complexes exhibiting magnetic bistability can behave as molecular nanomagnets, also known as single-molecule magnets (SMMs), suitable for storing magnetic information at the molecular level, thus attracting extensive interest in the quest for high-density information storage and quantum information technologies. Upon encapsulating Ln ion(s) into fullerene cages, endohedral metallofullerenes (EMFs) have been proven as a promising and versatile platform to realize chemically robust SMMs, in which the magnetic properties are able to be readily tailored by altering the configurations of the encapsulated species and the host cages. In this review, we present critical discussions on the molecular structures and magnetic characterizations of EMF-SMMs, with the focus on their peculiar molecular and electronic structures and on the intriguing molecular magnetism arising from such structural uniqueness. In this context, different families of magnetic EMFs are summarized, including mononuclear EMF-SMMs wherein single-ion anisotropy is decisive, dinuclear clusterfullerenes whose magnetism is governed by intramolecular magnetic interaction, and radical-bridged dimetallic EMFs with high-spin ground states that arise from the strong ferromagnetic coupling. We then discuss how molecular assemblies of SMMs can be constructed, in a way that the original SMM behavior is either retained or altered in a controlled manner, thanks to the chemical robustness of EMFs. Finally, on the basis of understanding the structure-magnetic property correlation, we propose design strategies for high-performance EMF-SMMs by engineering ligand fields, electronic structures, magnetic interactions, and molecular vibrations that can couple to the spin states.
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Affiliation(s)
- Ziqi Hu
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei 230026, China.
| | - Shangfeng Yang
- Key Laboratory of Precision and Intelligent Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Materials Science and Engineering, Anhui Laboratory of Advanced Photon Science and Technology, University of Science and Technology of China, Hefei 230026, China.
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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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4
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Chiesa A, Santini P, Garlatti E, Luis F, Carretta S. Molecular nanomagnets: a viable path toward quantum information processing? REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2024; 87:034501. [PMID: 38314645 DOI: 10.1088/1361-6633/ad1f81] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 01/17/2024] [Indexed: 02/06/2024]
Abstract
Molecular nanomagnets (MNMs), molecules containing interacting spins, have been a playground for quantum mechanics. They are characterized by many accessible low-energy levels that can be exploited to store and process quantum information. This naturally opens the possibility of using them as qudits, thus enlarging the tools of quantum logic with respect to qubit-based architectures. These additional degrees of freedom recently prompted the proposal for encoding qubits with embedded quantum error correction (QEC) in single molecules. QEC is the holy grail of quantum computing and this qudit approach could circumvent the large overhead of physical qubits typical of standard multi-qubit codes. Another important strength of the molecular approach is the extremely high degree of control achieved in preparing complex supramolecular structures where individual qudits are linked preserving their individual properties and coherence. This is particularly relevant for building quantum simulators, controllable systems able to mimic the dynamics of other quantum objects. The use of MNMs for quantum information processing is a rapidly evolving field which still requires to be fully experimentally explored. The key issues to be settled are related to scaling up the number of qudits/qubits and their individual addressing. Several promising possibilities are being intensively explored, ranging from the use of single-molecule transistors or superconducting devices to optical readout techniques. Moreover, new tools from chemistry could be also at hand, like the chiral-induced spin selectivity. In this paper, we will review the present status of this interdisciplinary research field, discuss the open challenges and envisioned solution paths which could finally unleash the very large potential of molecular spins for quantum technologies.
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Affiliation(s)
- A Chiesa
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
- INFN-Sezione di Milano-Bicocca, Gruppo Collegato di Parma, 43124 Parma, Italy
- UdR Parma, INSTM, I-43124 Parma, Italy
| | - P Santini
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
- INFN-Sezione di Milano-Bicocca, Gruppo Collegato di Parma, 43124 Parma, Italy
- UdR Parma, INSTM, I-43124 Parma, Italy
| | - E Garlatti
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
- INFN-Sezione di Milano-Bicocca, Gruppo Collegato di Parma, 43124 Parma, Italy
- UdR Parma, INSTM, I-43124 Parma, Italy
| | - F Luis
- Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC, Universidad de Zaragoza, Zaragoza, Spain
- Departamento de Fısica de la Materia Condensada, Universidad de Zaragoza, Zaragoza, Spain
| | - S Carretta
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
- INFN-Sezione di Milano-Bicocca, Gruppo Collegato di Parma, 43124 Parma, Italy
- UdR Parma, INSTM, I-43124 Parma, Italy
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5
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Wang JH, Javed MK, Li JX, Zhang YQ, Li ZY, Yamashita M. Ferromagnetically coupled single-chain magnets exhibiting a magnetic hysteresis of 0.42 Tesla in cyano-bridged FeIII2M II (M = Ni, Fe) coordination polymers. Dalton Trans 2023; 52:15510-15517. [PMID: 37581269 DOI: 10.1039/d3dt01043k] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
The synthesis, single-crystal structures and magnetic properties of two new double-zigzag-chain cyano-bridged heterobimetallic {[MII(Py-NOH)2][FeIII(Tp*)(CN)3]2}·H2O ([FeIII2MII]) (Py-NOH = 4-pyridinealdoxime, Tp* = tris(3,5-dimethylpyrazol-1-yl)borohydride, M = Ni (1), Fe (2)) compounds are reported. The crystal structures of both compounds were determined by single-crystal X-ray diffraction. Complexes 1 and 2 are isostructural, with the crystal structure comprising neutral double-zigzag (4,2-ribbon-like) bimetallic chains. The FeIII ion is coordinated by three cyanide carbon atoms and three nitrogen atoms of Tp* anions. However, the MII ion is surrounded by four cyanide nitrogen atoms and two nitrogen atoms from two Py-NOH ligands. The crystal structures and magnetic studies demonstrate that both complexes behave as single-chain magnetics (SCMs) with intrachain ferromagnetic coupling. Furthermore, [FeIII2NiII] exhibits an excellent coercive field of 0.42 T at 1.8 K, among cyano-bridged 3d transition-metal-based SCMs reported thus far. Preliminary theoretical calculations provide a deep understanding of the magnetic properties of [FeIII2NiII].
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Affiliation(s)
- Jin-Hua Wang
- School of Materials Science and Engineering, Nankai University, Tianjin 300350, China.
- Shandong Engineering Research Center of Novel Pharmaceutical Excipients, Sustained and Controlled Release Preparations, College of Medicine and Nursing, Dezhou University, Dezhou 253023, P. R. China
| | | | - Jia-Xin Li
- School of Physical Science and Technology, Nanjing Normal University, No.1 Wenyuan Road, Qixia District, Nanjing 210023, P. R. China
| | - Yi-Quan Zhang
- School of Physical Science and Technology, Nanjing Normal University, No.1 Wenyuan Road, Qixia District, Nanjing 210023, P. R. China
| | - Zhao-Yang Li
- School of Materials Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
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6
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Tejedor I, Urtizberea A, Natividad E, Martínez JI, Gascón I, Roubeau O. Dilute Gd hydroxycarbonate particles for localized spin qubit integration. MATERIALS HORIZONS 2023; 10:5214-5222. [PMID: 37725390 DOI: 10.1039/d3mh01201h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
Molecular spins are considered as the quantum hardware to build hybrid quantum processors in which coupling to superconducting devices would provide the means to implement the necessary coherent manipulations. As an alternative to large magnetically-dilute crystals or concentrated nano-scale deposits of paramagnetic molecules that have been studied so far, the use of pre-formed sub-micronic spherical particles of a doped Gd@Y hydroxycarbonate is evaluated here. Particles with an adjustable number of spin carriers are prepared through the control of both particle size and doping. Bulk magnetic properties and continuous wave and time-domain-EPR spectroscopy show that the Gd spins in these particles are potential qubits with robust quantum coherence. Monolayers of densely-packed particles are then formed interfacially and transferred successfully to the surface of Nb superconducting resonators. Alternatively, these particles are disposed at controlled localizations as isolated groups of a few particles through Dip-Pen Nanolithography using colloidal organic dispersions as ink. Altogether, this study offers new material and methodologies relevant to the development of viable hybrid quantum processors.
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Affiliation(s)
- Inés Tejedor
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, 50009 Zaragoza, Spain
| | - Ainhoa Urtizberea
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Campus Río Ebro, María de Luna 3, 50018 Zaragoza, Spain.
| | - Eva Natividad
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Campus Río Ebro, María de Luna 3, 50018 Zaragoza, Spain.
| | - Jesús I Martínez
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, 50009 Zaragoza, Spain
| | - Ignacio Gascón
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, 50009 Zaragoza, Spain
| | - Olivier Roubeau
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC and Universidad de Zaragoza, Plaza San Francisco s/n, 50009 Zaragoza, Spain
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7
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Zanella S, Aragon-Alberti M, Brite CDS, Salles F, Carlos LD, Long J. Luminescent Single-Molecule Magnets as Dual Magneto-Optical Molecular Thermometers. Angew Chem Int Ed Engl 2023; 62:e202306970. [PMID: 37418512 DOI: 10.1002/anie.202306970] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/30/2023] [Accepted: 07/03/2023] [Indexed: 07/09/2023]
Abstract
Luminescent thermometry allows the remote detection of the temperature and holds great potential in future technological applications in which conventional systems could not operate. Complementary approaches to measuring the temperature aiming to enhance the thermal sensitivity would however represent a decisive step forward. For the first time, we demonstrate the proof-of-concept that luminescence thermometry could be associated with a complementary temperature readout related to a different property. Namely, we propose to take advantage of the temperature dependence of both magnetic (canonical susceptibility and relaxation time) and luminescence features (emission intensity) found in Single-Molecule Magnets (SMM) to develop original dual magneto-optical molecular thermometers to conciliate high-performance SMM and Boltzmann-type luminescence thermometry. We highlight this integrative approach to concurrent luminescent and magnetic thermometry using an air-stable benchmark SMM [Dy(bbpen)Cl] (H2 bbpen=N,N'-bis(2-hydroxybenzyl)-N,N'-bis(2-methylpyridyl)ethyl-enediamine)) exhibiting Dy3+ luminescence. The synergy between multiparametric magneto-optical readouts and multiple linear regression makes possible a 10-fold improvement in the relative thermal sensitivity of the thermometer over the whole temperature range, compared with the values obtained with the single optical or magnetic devices.
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Affiliation(s)
- Sofia Zanella
- Phantom-g, CICECO-Aveiro Institute of Materials, Physics Department, University of Aveiro, 3810-193, Aveiro, Portugal
| | | | - Carlos D S Brite
- Phantom-g, CICECO-Aveiro Institute of Materials, Physics Department, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Fabrice Salles
- ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France
| | - Luís D Carlos
- Phantom-g, CICECO-Aveiro Institute of Materials, Physics Department, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Jérôme Long
- ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France
- Institut Universitaire de France, (IUF), 1 rue Descartes, 75231, Paris Cedex 05, France
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8
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Santanni F, Briganti M, Serrano G, Salvadori E, Veneri A, Batistoni C, Russi SF, Menichetti S, Mannini M, Chiesa M, Sorace L, Sessoli R. VdW Mediated Strong Magnetic Exchange Interactions in Chains of Hydrogen-Free Sublimable Molecular Qubits. JACS AU 2023; 3:1250-1262. [PMID: 37124308 PMCID: PMC10131211 DOI: 10.1021/jacsau.3c00121] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 03/31/2023] [Accepted: 03/31/2023] [Indexed: 05/03/2023]
Abstract
Sulfur-rich molecular complexes of dithiolene-like ligands are appealing candidates as molecular spin qubits because spin coherence properties are enhanced in hydrogen-free environments. Herein, we employ the hydrogen-free mononegative 1,3,2-dithiazole-4-thione-5-thiolate (dttt-) ligand as an alternative to common dinegative dithiolate ligands. We report the first synthesis and structural characterization of its Cu2+, Ni2+, and Pt2+ neutral complexes. The XPS analysis of thermal deposition of [Cu(dttt)2] in UHV conditions indicates that films of intact molecules can be deposited on surfaces by sublimation. Thanks to a combined approach employing DC magnetometry and DFT calculations, we highlighted AF exchange interactions of 108 cm-1 and 36 cm-1 attributed to the two different polymorph phases. These couplings are exclusively mediated by S···S VdW interactions, which are facilitated by the absence of counterions and made particularly efficient by the diffuse electron density on S atoms. Furthermore, the spin dynamics of solid-state magnetically diluted samples was investigated. The longest observed T m is 2.3 μs at 30 K, which significantly diverges from the predicted T m > 100 μs. These results point to the diluting matrix severely affecting the coherence lifetime of Cu2+ species via different factors, such as the contributions of neighboring 14N nuclei and the formation of radical impurities in a non-completely controllable way. However, the ease of processing [Cu(dttt)2] via thermal sublimation can allow dispersion in matrices better suited for coherent spin manipulation of isolated molecules and the realization of AF-coupled VdW structures on surfaces.
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Affiliation(s)
- Fabio Santanni
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Matteo Briganti
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Giulia Serrano
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
- Dipartimento
di Ingegneria Industriale - DIEF, Università
degli Studi di Firenze, Via Santa Marta 3, I-50139 Firenze, Italy
| | - Enrico Salvadori
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
- Dipartimento
di Chimica e NIS Centre, Università
di Torino, Via P. Giuria 7, I-10125 Torino, Italy
| | - Alessandro Veneri
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Chiara Batistoni
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Sofia F. Russi
- Dipartimento
di Chimica e NIS Centre, Università
di Torino, Via P. Giuria 7, I-10125 Torino, Italy
| | - Stefano Menichetti
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Matteo Mannini
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Mario Chiesa
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
- Dipartimento
di Chimica e NIS Centre, Università
di Torino, Via P. Giuria 7, I-10125 Torino, Italy
| | - Lorenzo Sorace
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
| | - Roberta Sessoli
- Dipartimento
di Chimica “Ugo Schiff” - DICUS, Università degli Studi di Firenze, Via della Lastruccia 3-13, I-50019 Sesto Fiorentino, Firenze, Italy
- Consorzio
Interuniversitario Nazionale di Scienza e Tecnologia dei Materiali
- INSTM, Via G. Giusti
9, I-50121 Firenze, Italy
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9
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Tesi L, Stemmler F, Winkler M, Liu SSY, Das S, Sun X, Zharnikov M, Ludwigs S, van Slageren J. Modular Approach to Creating Functionalized Surface Arrays of Molecular Qubits. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2208998. [PMID: 36609776 DOI: 10.1002/adma.202208998] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 11/30/2022] [Indexed: 06/17/2023]
Abstract
The quest for developing quantum technologies is driven by the promise of exponentially faster computations, ultrahigh performance sensing, and achieving thorough understanding of many-particle quantum systems. Molecular spins are excellent qubit candidates because they feature long coherence times, are widely tunable through chemical synthesis, and can be interfaced with other quantum platforms such as superconducting qubits. A present challenge for molecular spin qubits is their integration in quantum devices, which requires arranging them in thin films or monolayers on surfaces. However, clear proof of the survival of quantum properties of molecular qubits on surfaces has not been reported so far. Furthermore, little is known about the change in spin dynamics of molecular qubits going from the bulk to monolayers. Here, a versatile bottom-up method is reported to arrange molecular qubits as functional groups of self-assembled monolayers (SAMs) on surfaces, combining molecular self-organization and click chemistry. Coherence times of up to 13 µs demonstrate that qubit properties are maintained or even enhanced in the monolayer.
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Affiliation(s)
- Lorenzo Tesi
- Institute of Physical Chemistry and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Friedrich Stemmler
- Institute of Physical Chemistry and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Mario Winkler
- Institute of Physical Chemistry and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Sherri S Y Liu
- IPOC-Functional Polymers, Institute of Polymer Chemistry and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Saunak Das
- Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120, Heidelberg, Germany
| | - Xiuming Sun
- IPOC-Functional Polymers, Institute of Polymer Chemistry and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Michael Zharnikov
- Applied Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120, Heidelberg, Germany
| | - Sabine Ludwigs
- IPOC-Functional Polymers, Institute of Polymer Chemistry and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Joris van Slageren
- Institute of Physical Chemistry and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
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10
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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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11
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Cao J, Ye L, He D, Zheng X, Mukamel S. Magnet-Free Time-Resolved Magnetic Circular Dichroism with Pulsed Vector Beams. J Phys Chem Lett 2022; 13:11300-11306. [PMID: 36449825 DOI: 10.1021/acs.jpclett.2c03370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Magnetic circular dichroism (MCD) is a widely used spectroscopic technique which reveals valuable information about molecular geometry and electronic structure. However, the weak signal and the necessary strong magnets impose major limitations on its application. We propose a novel protocol to overcome these limitations by using pulsed vector beams (VBs), which consist of nanosecond gigahertz pump and femtosecond UV-vis probe pulses. By virtue of the strong longitudinal electromagnetic fields, the MCD signal detected by using the pulsed VBs is greatly enhanced compared to conventional MCD performed with plane waves. Furthermore, varying the pump-probe time delay allows monitoring the ultrafast variation of molecular properties.
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Affiliation(s)
- Jiaan Cao
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Lyuzhou Ye
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Dawei He
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiao Zheng
- Department of Chemistry, Fudan University, Shanghai, 200433, China
| | - Shaul Mukamel
- Department of Chemistry and Department of Physics and Astronomy, University of California, Irvine, California 92697, United States
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12
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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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13
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Averyanov DV, Sokolov IS, Taldenkov AN, Parfenov OE, Tokmachev AM, Storchak VG. 2D magnetic phases of Eu on Ge(110). NANOSCALE 2022; 14:12377-12385. [PMID: 35972030 DOI: 10.1039/d2nr02777a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
2D magnetic materials are at the forefront of research on fundamentals of magnetism; they exhibit unconventional phases and properties controlled by external stimuli. 2D magnets offer a solution to the problem of miniaturization of spintronic devices. A technological target of materials science is to find suitable magnetic materials and scale their thickness down as much as possible, a single monolayer being a natural limit. However, magnetism does not halt at one monolayer - it may persist beyond this boundary, to sparse but regular lattices of magnetic atoms. Here, we report 2D magnetic phases of Eu on the Ge(110) surface. We synthesized two submonolayer structures Eu/Ge(110) employing molecular beam epitaxy. The phases, identified by electron diffraction, differ in the surface density of Eu atoms. At low temperature, they exhibit magnetic ordering with magnetic moments lying in-plane. Strong dependence of the effective magnetic transition temperature on weak magnetic fields points at the 2D nature of the observed magnetism. The results are set against those on the Eu/Si system. The study of Eu/Ge(110) magnets demonstrates that a variety of substrates of different structure and symmetry can host submonolayer 2D magnetic phases, suggesting the phenomenon to be rather general.
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Affiliation(s)
- Dmitry V Averyanov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Ivan S Sokolov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Alexander N Taldenkov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Oleg E Parfenov
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Andrey M Tokmachev
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
| | - Vyacheslav G Storchak
- National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
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14
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Wang D, Wang Z, Wu S, Yin X, Tang CS, Feng YP, Wu J, Wee ATS. Realizing Two-Dimensional Supramolecular Arrays of a Spin Molecule via Halogen Bonding. ACS NANOSCIENCE AU 2022; 2:333-340. [PMID: 37102064 PMCID: PMC10125333 DOI: 10.1021/acsnanoscienceau.2c00005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Well-ordered spin arrays are desirable for next-generation molecule-based magnetic devices, yet their synthetic method remains a challenging task. Herein, we demonstrate the realization of two-dimensional supramolecular spin arrays on surfaces via halogen-bonding molecular self-assembly. A bromine-terminated perchlorotriphenylmethyl radical with net carbon spin was synthesized and deposited on Au(111) to achieve two-dimensional supramolecular spin arrays. By taking advantage of the diversity of halogen bonds, five supramolecular spin arrays form and are probed by low-temperature scanning tunneling microscopy at the single-molecule level. First-principles calculations verify that the formation of three distinct types of halogen bonds can be used to tailor supramolecular spin arrays via molecular coverage and annealing temperature. Our work suggests that supramolecular self-assembly can be a promising method to engineer two-dimensional molecular spin arrays.
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Affiliation(s)
- Dingguan Wang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Zishen Wang
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Shaofei Wu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Xinmao Yin
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore 117603, Singapore
- Shanghai Key Laboratory of High Temperature Superconductors, Physics Department, Shanghai University, Shanghai 200444, China
| | - Chi Sin Tang
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore 117603, Singapore
- Institute of Materials Research and Engineering, ASTAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Yuan Ping Feng
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Jishan Wu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Andrew T S Wee
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
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15
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de Souza MS, Reis SG, Stinghen D, Escobar LBL, Allão Cassaro RA, Poneti G, S Bortolot C, Marbey J, Hill S, Vaz MGF. High-Frequency EPR Studies of New 2p-3d Complexes Based on a Triazolyl-Substituted Nitronyl Nitroxide Radical: The Role of Exchange Anisotropy in a Cu-Radical System. Inorg Chem 2022; 61:12118-12128. [PMID: 35876616 DOI: 10.1021/acs.inorgchem.2c00679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using the 1-(m-tolyl)-1H-1,2,3-triazole-4-(4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) (TlTrzNIT) radical and metal β-diketonate complexes [M(hfac)2(H2O)2], where hfac is hexafluoroacetylacetonato, three new 2p-3d heterospin complexes were synthesized. Their structures were solved using single crystal X-ray diffraction data, and magnetic investigation was performed by DC and AC measurements and multifrequency EPR spectroscopy. Compounds 1 and 2 are isostructural complexes with molecular formula [M3(TlTrzNIT)2(hfac)6] (MII = Mn or Cu) while compound 3 is the mononuclear [Co(TlTrzNIT)(hfac)2] complex. In all complexes, the radical acts as a bidentate ligand through the oxygen atom of the nitroxide moiety and the nitrogen atom from the triazole group. Furthermore, in compounds 1 and 2, the TlTrzNIT is bridge-coordinated between two metal centers, leading to the formation of trinuclear complexes. The fitting of the static magnetic behavior reveals antiferromagnetic and ferromagnetic intramolecular interactions for complexes 1 and 2, respectively. The EPR spectra of 1 are well described by an isolated ferrimagnetic S = 13/2 (= 5/2 - 1/2 + 5/2 - 1/2 + 5/2) ground state with a biaxial zero-field splitting (ZFS) interaction characterized, respectively, by 2nd order axial and rhombic parameters, D and E, such that E/D is close to the maximum of 0.33. Meanwhile, EPR spectra for 2 are explained in terms of a ferromagnetic model with weakly anisotropic Cu-radical exchange interactions, giving rise to an isolated S = 5/2 (= 5 × 1/2) ground state with both an anisotropic g tensor and a weak ZFS interaction. Complex 2 represents one of only a few examples of Cu-radical moieties with measurable exchange anisotropy.
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Affiliation(s)
- Mateus S de Souza
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro 24020-150, Brazil
| | - Samira G Reis
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro 24020-150, Brazil
| | - Danilo Stinghen
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro 24020-150, Brazil
| | - Lívia B L Escobar
- Instituto de Física, Universidade Federal Fluminense, Niterói, Rio de Janeiro 24210-346, Brazil.,NHMFL, Florida State University, Tallahassee, Florida 32310, United States.,Departamento de Química, Pontifícia Universidade Católica, Gávea, Rio de Janeiro, RJ 22453-900, Brazil
| | - Rafael A Allão Cassaro
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 21941-909, Brazil
| | - Giordano Poneti
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 21941-909, Brazil
| | - Carolina S Bortolot
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro 24020-150, Brazil
| | - Jonathan Marbey
- NHMFL, Florida State University, Tallahassee, Florida 32310, United States.,Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Stephen Hill
- NHMFL, Florida State University, Tallahassee, Florida 32310, United States.,Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Maria G F Vaz
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro 24020-150, Brazil
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16
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Szklarzewicz J, Hodorowicz M, Jurowska A, Baran S. The High-Temperature Soft Ferromagnetic Molecular Materials Based on [W(CN) 6(bpy)] 2-/- System. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27144525. [PMID: 35889398 PMCID: PMC9315671 DOI: 10.3390/molecules27144525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 07/04/2022] [Accepted: 07/12/2022] [Indexed: 11/16/2022]
Abstract
The synthesis of molecular materials with magnetic properties, in particular ferromagnetic properties, has been the subject of interest in coordination chemistry for decades. In the last three decades, research has accelerated, as it has emerged that creating bridging systems based on cyanido ligands is a good and relatively simple way to create complex polymer structures exhibiting magnetic properties. Based on many years of personal experience in the field of the synthesis of polycyanido systems, supported by comprehensive structural analysis, a simple method of transforming cyanido complexes into soft ferromagnetic materials with a Curie temperature (TC) higher than the thermal decomposition temperature, usually above 150 °C has been developed. Two soft ferromagnetic materials based on zinc and cadmium hexacyanido salts in the system with [W(CN)6(bpy)]2−/− anions are presented. The crystal structures (X-ray single crystal as well as XRD) of the precursors and the properties of the ferromagnetic materials are discussed. Most importantly, a patented method of synthesizing this type of material, based on which we obtain more than 80 soft, high-temperature ferromagnetic compounds, which proves the wide spectrum of this method, is also presented.
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Affiliation(s)
- Janusz Szklarzewicz
- Faculty of Chemistry, Jagiellonian University, 30-387 Kraków, Poland; (M.H.); (A.J.)
- Correspondence:
| | - Maciej Hodorowicz
- Faculty of Chemistry, Jagiellonian University, 30-387 Kraków, Poland; (M.H.); (A.J.)
| | - Anna Jurowska
- Faculty of Chemistry, Jagiellonian University, 30-387 Kraków, Poland; (M.H.); (A.J.)
| | - Stanisław Baran
- M. Smoluchowski Institute of Physics, Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, 30-001 Kraków, Poland;
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17
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Koutsouflakis E, Krylov D, Bachellier N, Sostina D, Dubrovin V, Liu F, Spree L, Velkos G, Schimmel S, Wang Y, Büchner B, Westerström R, Bulbucan C, Kirkpatrick K, Muntwiler M, Dreiser J, Greber T, Avdoshenko SM, Dorn H, Popov AA. Metamagnetic transition and a loss of magnetic hysteresis caused by electron trapping in monolayers of single-molecule magnet Tb 2@C 79N. NANOSCALE 2022; 14:9877-9892. [PMID: 35781298 DOI: 10.1039/d1nr08475e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Realization of stable spin states in surface-supported magnetic molecules is crucial for their applications in molecular spintronics, memory storage or quantum information processing. In this work, we studied the surface magnetism of dimetallo-azafullerene Tb2@C79N, showing a broad magnetic hysteresis in a bulk form. Surprisingly, monolayers of Tb2@C79N exhibited a completely different behavior, with the prevalence of a ground state with antiferromagnetic coupling at low magnetic field and a metamagnetic transition in the magnetic field of 2.5-4 T. Monolayers of Tb2@C79N were deposited onto Cu(111) and Au(111) by evaporation in ultra-high vacuum conditions, and their topography and electronic structure were characterized by scanning tunneling microscopy and spectroscopy (STM/STS). X-ray photoelectron spectroscopy (XPS), in combination with DFT studies, revealed that the nitrogen atom of the azafullerene cage tends to avoid metallic surfaces. Magnetic properties of the (sub)monolayers were then studied by X-ray magnetic circular dichroism (XMCD) at the Tb-M4,5 absorption edge. While in bulk powder samples Tb2@C79N behaves as a single-molecule magnet with ferromagnetically coupled magnetic moments and blocking of magnetization at 28 K, its monolayers exhibited a different ground state with antiferromagnetic coupling of Tb magnetic moments. To understand if this unexpected behavior is caused by a strong hybridization of fullerenes with metallic substrates, XMCD measurements were also performed for Tb2@C79N adsorbed on h-BN|Rh(111) and MgO|Ag(100). The co-existence of two forms of Tb2@C79N was found on these substrates as well, but magnetization curves showed narrow magnetic hysteresis detectable up to 25 K. The non-magnetic state of Tb2@C79N in monolayers is assigned to anionic Tb2@C79N- species with doubly-occupied Tb-Tb bonding orbital and antiferromagnetic coupling of the Tb moments. A charge transfer from the substrate or trapping of secondary electrons are discussed as a plausible origin of these species.
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Affiliation(s)
- Emmanouil Koutsouflakis
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Denis Krylov
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Nicolas Bachellier
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Daria Sostina
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Vasilii Dubrovin
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Lukas Spree
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Georgios Velkos
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Sebastian Schimmel
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Yaofeng Wang
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Rasmus Westerström
- The Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
- NanoLund, Lund University, Box 118, 22100 Lund, Sweden
| | - Claudiu Bulbucan
- The Division of Synchrotron Radiation Research, Lund University, SE-22100 Lund, Sweden
- NanoLund, Lund University, Box 118, 22100 Lund, Sweden
| | - Kyle Kirkpatrick
- Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - Matthias Muntwiler
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Jan Dreiser
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Thomas Greber
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
- Physik-Institut der Universität Zürich, Winterthurerstr. 190, CH-8057 Zürich, Switzerland
| | - Stas M Avdoshenko
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
| | - Harry Dorn
- Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
| | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany.
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18
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Magnetic molecules as local sensors of topological hysteresis of superconductors. Nat Commun 2022; 13:3838. [PMID: 35788608 PMCID: PMC9253336 DOI: 10.1038/s41467-022-31320-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 06/14/2022] [Indexed: 11/08/2022] Open
Abstract
Superconductors and magnetic materials, including molecules, are key ingredients for quantum computing and spintronics. However, only a little is known about how these materials interact in multilayer nanostructures like the hybrid architectures nowadays under development for such advanced applications. Here, we show that a single layer of magnetic molecules, Terbium(III) bis-phthalocyaninato (TbPc2) complexes, deposited under controlled UHV conditions on a superconducting Pb(111) surface is sensitive to the topology of the intermediate state of the superconductor, namely to the presence and evolution of superconducting and normal domains due to screening and penetration of an external magnetic field. The topological hysteresis of the superconducting substrate imprints a local evolution of the magnetisation of the TbPc2 molecules in the monolayer. Element and surface selective detection is achieved by recording the X-ray magnetic circular dichroism of the Tb atoms. This study reveals the impressive potential of magnetic molecules for sensing local magnetic field variations in molecular/superconductor hybrid devices, including spin resonators or spin injecting and spin filtering components for spintronics applications.
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19
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Guo FS, He M, Huang GZ, Giblin SR, Billington D, Heinemann FW, Tong ML, Mansikkamäki A, Layfield RA. Discovery of a Dysprosium Metallocene Single-Molecule Magnet with Two High-Temperature Orbach Processes. Inorg Chem 2022; 61:6017-6025. [PMID: 35420419 PMCID: PMC9044448 DOI: 10.1021/acs.inorgchem.1c03980] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Magnetic bistability
in single-molecule magnets (SMMs) is a potential
basis for new types of nanoscale information storage material. The
standard model for thermally activated relaxation of the magnetization
in SMMs is based on the occurrence of a single Orbach process. Here,
we show that incorporating a phosphorus atom into the framework of
the dysprosium metallocene [(CpiPr5)Dy(CpPEt4)]+[B(C6F5)4]− (CpiPr5 is penta-isopropylcyclopentadienyl,
CpPEt4 is tetraethylphospholyl) leads to the occurrence
of two distinct high-temperature Orbach processes, with energy barriers
of 1410(10) and 747(7) cm–1, respectively. These
barriers provide experimental evidence for two different spin–phonon
coupling regimes, which we explain with the aid of ab initio calculations.
The strong and highly axial crystal field in this SMM also allows
magnetic hysteresis to be observed up to 70 K, using a scan rate of
25 Oe s–1. In characterizing this SMM, we show that
a conventional Debye model and consideration of rotational contributions
to the spin–phonon interaction are insufficient to explain
the observed phenomena. A
phospholyl-ligated dysprosium metallocene single-molecule
magnet shows two high-temperature Orbach relaxation processes with
effective energy barriers of 1410(10) and 747(7) cm−1, and magnetic hysteresis up to 70 K when using a scan rate of 25
Oe s−1.
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Affiliation(s)
- Fu-Sheng Guo
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QR, U.K
| | - Mian He
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QR, U.K
| | - Guo-Zhang Huang
- Key Laboratory of Bioinorganic and Synthetic Chemistry of the Ministry of Education, School of Chemistry, Sun-Yat Sen University, Guangzhou 510006, P. R. China
| | - Sean R Giblin
- School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, U.K
| | - David Billington
- School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, U.K
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander-University Erlangen-Nürnberg, Egerlandstrabe 1, 91058 Erlangen, Germany
| | - Ming-Liang Tong
- Key Laboratory of Bioinorganic and Synthetic Chemistry of the Ministry of Education, School of Chemistry, Sun-Yat Sen University, Guangzhou 510006, P. R. China
| | - Akseli Mansikkamäki
- NMR Research Group, University of Oulu, P.O. Box 8000, Oulu FI-90014, Finland
| | - Richard A Layfield
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QR, U.K
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20
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A tetrairon(III) single-molecule magnet and its solvatomorphs: synthesis, crystal structures and vapor-phase processing. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Brinker S, Küster F, Parkin SSP, Sessi P, Lounis S. Anomalous excitations of atomically crafted quantum magnets. SCIENCE ADVANCES 2022; 8:eabi7291. [PMID: 35080983 PMCID: PMC8791613 DOI: 10.1126/sciadv.abi7291] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 12/06/2021] [Indexed: 06/14/2023]
Abstract
High-energy resolution spectroscopic studies of quantum magnets proved extremely valuable in accessing magnetodynamics quantities, such as energy barriers, magnetic interactions, and lifetime of excited states. Here, we investigate a previously unexplored flavor of low-energy spin excitations for quantum spins coupled to an electron bath. In sharp contrast to the usual tunneling signature of two steps symmetrically centered around the Fermi level, we find a single step in the conductance. Combining time-dependent and many-body perturbation theories, magnetic field-dependent tunneling spectra are explained as the result of an interplay between weak magnetic anisotropy energy, magnetic interactions, and Stoner-like electron-hole excitations that are strongly dependent on the magnetic states of the nanostructures. The results are rationalized in terms of a noncollinear magnetic ground state and the dominance of ferro- and antiferromagnetic interactions. The atomically crafted nanomagnets offer an appealing model for the exploration of electrically pumped spin systems.
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Affiliation(s)
- Sascha Brinker
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich D-52425, Germany
| | - Felix Küster
- Max Planck Institute of Microstructure Physics, Halle 06120, Germany
| | | | - Paolo Sessi
- Max Planck Institute of Microstructure Physics, Halle 06120, Germany
| | - Samir Lounis
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, Jülich D-52425, Germany
- Faculty of Physics, University of Duisburg-Essen and CENIDE, 47053 Duisburg, Germany
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22
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Investigation of a Tetrathiafulvalene-Based Fe2+ Thermal Spin Crossover Assembled on Gold Surface. MAGNETOCHEMISTRY 2022. [DOI: 10.3390/magnetochemistry8020014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A thick film and a monolayer of tetrathiafulvalene-based Fe2+ spin-crossover complex have been deposited by solution on a Au (111) substrate, attempting both self-assembling monolayer protocol and a simpler drop-casting procedure. The thermally induced spin transition has been investigated using X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). Temperature-dependent investigations demonstrated the retention of the switching behavior between the two spin states in thick molecular films obtained by drop-casting, while in the monolayer sample, the loss of the spin-crossover properties appears as a possible consequence of the strong interaction between the sulfur atoms of the ligand and the gold substrate.
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23
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Dunstan MA, Cagnes M, Phonsri W, Murray KS, Mole RA, Boskovic C. Magnetic properties and neutron spectroscopy of lanthanoid-{tetrabromocatecholate/18-crown-6} single-molecule magnets. Aust J Chem 2022. [DOI: 10.1071/ch21306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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24
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Dearle AE, Cutler DJ, Coletta M, Lee E, Dey S, Sanz S, Fraser HWL, Nichol GS, Rajaraman G, Schnack J, Cronin L, Brechin EK. An [FeIII30] molecular metal oxide. Chem Commun (Camb) 2021; 58:52-55. [PMID: 34807967 DOI: 10.1039/d1cc06224g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dissolution of FeBr3 in a mixture of acetonitrile and 3,4-lutidine in the presence of an amine results in the formation of an [Fe30] molecular metal oxide containing alternating layers of tetrahedral and octahedral FeIII ions. Mass spectrometry suggests the cluster is formed quickly and remains stable in solution, while magnetic measurements and DFT calculations reveal competing antiferromagnetic exchange interactions.
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Affiliation(s)
- Alice E Dearle
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Daniel J Cutler
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Marco Coletta
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Edward Lee
- WestCHEM School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK.
| | - Sourav Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India.
| | - Sergio Sanz
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Hector W L Fraser
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Gary S Nichol
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India.
| | - Jürgen Schnack
- Fakultät für Physik, Universitat Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany.
| | - Leroy Cronin
- WestCHEM School of Chemistry, The University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK.
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
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25
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Syntheses, Structures and Magnetic Properties of M2 (M = Fe, Co) Complexes with N6 Coordination Environment: Field-Induced Slow Magnetic Relaxation in Co2. MAGNETOCHEMISTRY 2021. [DOI: 10.3390/magnetochemistry7120153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Two dinuclear complexes [M2(H2L)2](ClO4)4·2MeCN (M = Co for Co2 and Fe for Fe2) were synthesized using a symmetric hydrazone ligand with the metal ions in an N6 coordination environment. The crystal structures and magnetic properties were determined by single-crystal X-ray diffraction and magnetic susceptibility measurements. The crystal structure study revealed that the spin centers were all in the high-spin state with a distorted octahedron (Oh) geometry. Dynamic magnetic properties measurements revealed that complex Co2 exhibited field-induced single-molecule magnet properties with two-step relaxation in which the fast relaxation path was from QTM and the slow relaxation path from the thermal relaxation under an applied field.
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26
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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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27
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Serrano G, Sorrentino AL, Poggini L, Cortigiani B, Goletti C, Sessoli R, Mannini M. Substrate mediated interaction of terbium(III) double-deckers with the TiO 2(110) surface. Phys Chem Chem Phys 2021; 23:12060-12067. [PMID: 34013308 DOI: 10.1039/d1cp00928a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A terbium(iii)-bis(phthalocyaninato) neutral complex was deposited on the rutile TiO2(110) surface, and their interaction was studied by Scanning Tunneling Microscopy (STM) and X-ray Photoelectron Spectroscopy (XPS). It was found that the TiO2 rutile surface favours the adsorption of isolated molecules adopting a lying down configuration with the phthalocyanine planes tilted by about 30° when they lie in the first layer. The electronic and chemical properties of the molecules on the surface were studied by XPS as a function of the TiO2(110) substrate preparation. This study evidences that strong molecule-substrate interactions are present and a charge transfer process occurs from the molecule to the surface.
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Affiliation(s)
- Giulia Serrano
- Department of Chemistry "U. Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy and Department of Industrial Engineering and INSTM Research Unit, University of Florence, Via Santa Marta 3, 50139 Florence (FI), Italy.
| | - Andrea Luigi Sorrentino
- Department of Chemistry "U. Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy and Department of Industrial Engineering and INSTM Research Unit, University of Florence, Via Santa Marta 3, 50139 Florence (FI), Italy.
| | - Lorenzo Poggini
- Department of Chemistry "U. Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy and Institute for Chemistry of OrganoMetallic Compounds (ICCOM-CNR), Via Madonna del Piano, 50019 Sesto Fiorentino (FI), Italy.
| | - Brunetto Cortigiani
- Department of Chemistry "U. Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy
| | - Claudio Goletti
- Dipartimento di Fisica, Università degli Studi di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133, Rome, Italy
| | - Roberta Sessoli
- Department of Chemistry "U. Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy
| | - Matteo Mannini
- Department of Chemistry "U. Schiff" and INSTM Research Unit, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino (FI), Italy
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28
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Zhang Z, Yin F, Wang C, Li Z, Liu H. Magnetic field-controlled spin-dependent thermoelectric current in a single-molecule magnet transistor. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:235302. [PMID: 33784643 DOI: 10.1088/1361-648x/abf385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 03/30/2021] [Indexed: 06/12/2023]
Abstract
Control of the charge, spin, and heat currents in thermoelectric devices is an interesting research field that is currently experiencing a burst of activity. In this work, a new type of spin-current generator is proposed that consists of a single-molecule magnet sandwiched between a pair of nonmagnetic electrodes. By applying an external magnetic field, this tunneling junction can generate a 100% spin-polarized current via thermoelectric effects, and the flow direction and spin polarization can be changed by adjusting the gate voltage or magnetic field. Moreover, regardless of whether the external magnetic field exists, the thermoelectric current is always highly spin polarized and can be switched by using different gate voltage windows. This molecular electrical device can be realized with current technologies and may have practical use in spin caloritronics and quantum information processing.
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Affiliation(s)
- Zhengzhong Zhang
- Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian 223003, People's Republic of China
| | - Fan Yin
- Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian 223003, People's Republic of China
| | - Chao Wang
- Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian 223003, People's Republic of China
| | - Zhongwen Li
- Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian 223003, People's Republic of China
| | - Hao Liu
- Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian 223003, People's Republic of China
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29
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Yu X, Xia Z, Zhao T, Yuan X, Ren L. Pyrene-Enhanced Ferromagnetic Interaction in a FeCl 4–-Based Poly(ionic liquid)s Organic Magnet. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00213] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Xiaoliang Yu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China
| | - Zhengyi Xia
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China
| | - Tengda Zhao
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China
| | - Xiaoyan Yuan
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China
| | - Lixia Ren
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, China
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30
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Zhang Z, Wang Y, Wang H, Liu H, Dong L. Controllable Spin Switching in a Single-Molecule Magnetic Tunneling Junction. NANOSCALE RESEARCH LETTERS 2021; 16:77. [PMID: 33934262 PMCID: PMC8088424 DOI: 10.1186/s11671-021-03531-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Accepted: 04/19/2021] [Indexed: 06/12/2023]
Abstract
A new type of spin-current filter is proposed that consists of a single-molecule magnet (SMM) coupled to two normal metal electrodes. It is shown that this tunneling junction can generate a highly spin-polarized current, whose spin polarization can be switched by means of magnetic fields and gate voltages applied to the SMM. This spin switching in the SMM tunnel junction arises from spin-selective single-electron resonant tunneling via the lowest unoccupied molecular orbit of the SMM. The electron current spectrum is still spin polarized in the absence of an external magnetic field, which can help to judge whether the molecule's spin state has reached the ground-state doublet [Formula: see text]. This device can be realized with current technologies and may have practical use in spintronics and quantum information.
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Affiliation(s)
- Zhengzhong Zhang
- Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian, China
| | - Ya Wang
- School of mechanical engineering and information, Shanghai Urban Construction Vocational College, Shanghai, China
| | - Haiou Wang
- Institute of Materials Physics, Hangzhou Dianzi University, Hangzhou, China
| | - Hao Liu
- Faculty of Mathematics and Physics, Huaiyin Institute of Technology, Huaian, China.
| | - Liming Dong
- School of Automotive Engineering, Changshu Institute of Technology, Changshu, China
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31
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Poggini L, Lunghi A, Collauto A, Barbon A, Armelao L, Magnani A, Caneschi A, Totti F, Sorace L, Mannini M. Chemisorption of nitronyl-nitroxide radicals on gold surface: an assessment of morphology, exchange interaction and decoherence time. NANOSCALE 2021; 13:7613-7621. [PMID: 33881100 DOI: 10.1039/d1nr00640a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A combined Tof-SIMS, XPS and STM characterization has been performed to study the deposition of a sulphur-functionalized nitronyl nitroxide radical on Au(111) clearly demonstrating the chemisorption of intact molecules. Continuous -wave EPR characterization showed that the radical molecules maintain their paramagnetic character. Pulsed EPR measurements allowed to determine the decoherence time of the nanostructure at 80 K, which turned out to be comparable to the one measured in frozen solution and longer than previously reported for many radicals and other paramagnetic molecules at much lower temperatures. Furthermore, we conducted a state-of-the-art ab initio molecular dynamics study, suggesting different possible scenarios for chemisorption geometries and predicting the energetically favoured geometry. Calculation of the magnetic properties indicates a partial non-innocent role of the gold surface in determining the magnetic interactions between radicals in packed structures. This suggests that the observed EPR spectrum is to be attributed to low-density domains of disordered radicals interacting via dipolar interactions.
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Affiliation(s)
- Lorenzo Poggini
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, I-50019 Sesto Fiorentino, Italy. and ICCOM-CNR, via Madonna del Piano 10, 50019 Sesto, Fiorentino, Italy.
| | - Alessandro Lunghi
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, I-50019 Sesto Fiorentino, Italy.
| | - Alberto Collauto
- Department of Chemical Sciences and INSTM Research Unit, University of Padua, I-35131 Padova, Italy
| | - Antonio Barbon
- Department of Chemical Sciences and INSTM Research Unit, University of Padua, I-35131 Padova, Italy
| | - Lidia Armelao
- Department of Chemical Sciences and INSTM Research Unit, University of Padua, I-35131 Padova, Italy and Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council of Italy, ICMATE-CNR, via Marzolo 1, 35131 Padua, Italy and Department of Chemical Sciences and Materials Technologies, National Research Council of Italy, DSCTM - CNR, Piazzale A. Moro 7, 00185 Rome, Italy
| | - Agnese Magnani
- Department of Biotechnologies, Chemistry and Pharmacy, and INSTM Research Unit, University of Siena, I-53100 Siena, Italy
| | - Andrea Caneschi
- DIEF - Department of Industrial Engineering and INSTM Research Unit, University of Florence, Via S. Marta 3, I-50139 Florence, Italy
| | - Federico Totti
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, I-50019 Sesto Fiorentino, Italy.
| | - Lorenzo Sorace
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, I-50019 Sesto Fiorentino, Italy.
| | - Matteo Mannini
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit, University of Florence, I-50019 Sesto Fiorentino, Italy.
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32
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Chen C, Spree L, Koutsouflakis E, Krylov DS, Liu F, Brandenburg A, Velkos G, Schimmel S, Avdoshenko SM, Fedorov A, Weschke E, Choueikani F, Ohresser P, Dreiser J, Büchner B, Popov AA. Magnetic Hysteresis at 10 K in Single Molecule Magnet Self-Assembled on Gold. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2000777. [PMID: 33717832 PMCID: PMC7927621 DOI: 10.1002/advs.202000777] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 11/26/2020] [Indexed: 06/12/2023]
Abstract
Tremendous progress in the development of single molecule magnets (SMMs) raises the question of their device integration. On this route, understanding the properties of low-dimensional assemblies of SMMs, in particular in contact with electrodes, is a necessary but difficult step. Here, it is shown that fullerene SMM self-assembled on metal substrate from solution retains magnetic hysteresis up to 10 K. Fullerene-SMM DySc2N@C80 and Dy2ScN@C80 are derivatized to introduce a thioacetate group, which is used to graft SMMs on gold. Magnetic properties of grafted SMMs are studied by X-ray magnetic circular dichroism and compared to the films of nonderivatized fullerenes prepared by sublimation. In self-assembled films, the magnetic moments of the Dy ions are preferentially aligned parallel to the surface, which is different from the disordered orientation of endohedral clusters in nonfunctionalized fullerenes. Whereas chemical derivatization reduces the blocking temperature of magnetization and narrows the hysteresis of Dy2ScN@C80, for DySc2N@C80 equally broad hysteresis is observed as in the fullerene multilayer. Magnetic bistability in the DySc2N@C80 grafted on gold is sustained up to 10 K. This study demonstrates that self-assembly of fullerene-SMM derivatives offers a facile solution-based procedure for the preparation of functional magnetic sub-monolayers with excellent SMM performance.
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Affiliation(s)
- Chia‐Hsiang Chen
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
- Department of Medicinal and Applied ChemistryKaohsiung Medical UniversityKaohsiung807Taiwan
| | - Lukas Spree
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Emmanouil Koutsouflakis
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Denis S. Krylov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
- Center for Quantum NanoscienceInstitute for Basic Science (IBS)Seoul03760Republic of Korea
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Ariane Brandenburg
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Georgios Velkos
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Sebastian Schimmel
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Stanislav M. Avdoshenko
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Alexander Fedorov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
- Helmholtz‐Zentrum Berlin für Materialien und EnergieWilhelm‐Conrad‐Röntgen‐Campus BESSY IIAlbert‐Einstein‐Strasse 15BerlinD‐12489Germany
| | - Eugen Weschke
- Helmholtz‐Zentrum Berlin für Materialien und EnergieWilhelm‐Conrad‐Röntgen‐Campus BESSY IIAlbert‐Einstein‐Strasse 15BerlinD‐12489Germany
| | - Fadi Choueikani
- Synchrotron SOLEILL'Orme des MerisiersSaint‐Aubin, BP 48Gif‐sur‐Yvette91192France
| | - Philippe Ohresser
- Synchrotron SOLEILL'Orme des MerisiersSaint‐Aubin, BP 48Gif‐sur‐Yvette91192France
| | - Jan Dreiser
- Swiss Light SourcePaul Scherrer InstituteVilligen PSICH‐5232Switzerland
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Alexey A. Popov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
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33
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Scott AJ, Vallejo J, Sarkar A, Smythe L, Regincós Martí E, Nichol GS, Klooster WT, Coles SJ, Murrie M, Rajaraman G, Piligkos S, Lusby PJ, Brechin EK. Exploiting host-guest chemistry to manipulate magnetic interactions in metallosupramolecular M 4L 6 tetrahedral cages. Chem Sci 2021; 12:5134-5142. [PMID: 34168772 PMCID: PMC8179613 DOI: 10.1039/d1sc00647a] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Reaction of Ni(OTf)2 with the bisbidentate quaterpyridine ligand L results in the self-assembly of a tetrahedral, paramagnetic cage [NiII4L6]8+. By selectively exchanging the bound triflate from [OTf⊂NiII4L6](OTf)7 (1), we have been able to prepare a series of host–guest complexes that feature an encapsulated paramagnetic tetrahalometallate ion inside this paramagnetic host giving [MIIX4⊂NiII4L6](OTf)6, where MIIX42− = MnCl42− (2), CoCl42− (5), CoBr42− (6), NiCl42− (7), and CuBr42− (8) or [MIIIX4⊂NiII4L6](OTf)7, where MIIIX4− = FeCl4− (3) and FeBr4− (4). Triflate-to-tetrahalometallate exchange occurs in solution and can also be accomplished through single-crystal-to-single-crystal transformations. Host–guest complexes 1–8 all crystallise as homochiral racemates in monoclinic space groups, wherein the four {NiN6} vertexes within a single Ni4L6 unit possess the same Δ or Λ stereochemistry. Magnetic susceptibility and magnetisation data show that the magnetic exchange between metal ions in the host [NiII4] complex, and between the host and the MX4n− guest, are of comparable magnitude and antiferromagnetic in nature. Theoretically derived values for the magnetic exchange are in close agreement with experiment, revealing that large spin densities on the electronegative X-atoms of particular MX4n− guest molecules lead to stronger host–guest magnetic exchange interactions. The tetrahedral [NiII4L6]8+ cage can reversibly bind paramagnetic MX41/2− guests, inducing magnetic exchange interactions between host and guest.![]()
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Affiliation(s)
- Aaron J Scott
- EaStCHEM School of Chemistry, The University of Edinburgh David Brewster Road Edinburgh EH93FJ UK
| | - Julia Vallejo
- EaStCHEM School of Chemistry, The University of Edinburgh David Brewster Road Edinburgh EH93FJ UK
| | - Arup Sarkar
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Lucy Smythe
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue Glasgow G12 8QQ UK
| | - E Regincós Martí
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue Glasgow G12 8QQ UK
| | - Gary S Nichol
- EaStCHEM School of Chemistry, The University of Edinburgh David Brewster Road Edinburgh EH93FJ UK
| | - Wim T Klooster
- UK National Crystallographic Service, Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton England SO17 1BJ UK
| | - Simon J Coles
- UK National Crystallographic Service, Chemistry, Faculty of Natural and Environmental Sciences, University of Southampton England SO17 1BJ UK
| | - Mark Murrie
- WestCHEM, School of Chemistry, University of Glasgow, University Avenue Glasgow G12 8QQ UK
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Stergios Piligkos
- Department of Chemistry, University of Copenhagen, Universitetsparken 5 2100 Copenhagen Denmark
| | - Paul J Lusby
- EaStCHEM School of Chemistry, The University of Edinburgh David Brewster Road Edinburgh EH93FJ UK
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh David Brewster Road Edinburgh EH93FJ UK
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Bellucci L, Labella L, Marchetti F, Pineider F, Poneti G, Samaritani S. Magnetic relaxation in dysprosium and terbium 1D-zigzag coordination chains having only 4,4′-bipyridine as connector. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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S-Functionalized Tripods with Monomethylene Spacers: Routes to Tetrairon(III) Single-Molecule Magnets with Ultrashort Tethering Groups. MAGNETOCHEMISTRY 2020. [DOI: 10.3390/magnetochemistry6040055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The organization of single-molecule magnets (SMMs) on surfaces is a mainstream research path in molecular magnetism. Of special importance is the control of grafting geometry in chemisorbed monolayers on metal surfaces. We herein present the synthesis, solid-state structure, and magnetic characterization of propeller-like tetrairon(III) SMMs containing the shortest-reported tethering groups for gold surfaces. Functionalization of molecular structure is attained using 2-R-2-(hydroxymethyl)propane-1,3-diol tripodal proligands (H3LR). The R substituents comprise a monomethylene spacer and three different terminations known to act as stable precursors of S-Au bonds (R = CH2SCN, CH2SAc and CH2SSnBu). These chemical groups are shown to be chemically compatible with the tetrairon(III) core and to afford fully-functional SMMs in crystalline form and in fair to excellent yields.
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Affiliation(s)
- Dong Shao
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing Jiangsu 210023 China
| | - Xin‐Yi Wang
- State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Advanced Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing Jiangsu 210023 China
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