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Liu D, Guo X, Zhang X, Al-Kahtani AA, Chibotaru LF. Building Molecular Nanomagnets by Encapsulating Lanthanide Ions in Boron Nitride Nanotubes: Ab Initio Investigation. Inorg Chem 2024; 63:3769-3780. [PMID: 38346334 DOI: 10.1021/acs.inorgchem.3c03930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
Lanthanide-based single-ion magnets have attracted much interest due to their great potential for information storage at the level of one molecule. Among various strategies to enhance magnetization blocking in such complexes, the synthesis of axially symmetric compounds is regarded as the most promising. Here, we investigate theoretically the magnetization blocking of several lanthanide ions (Tb3+, Dy3+, Ho3+, Er3+, and Tm3+) encapsulated in highly symmetric zigzag boron nitride nanotubes (BNNTs) of different diameters with ab initio methodology. We found that Tb3+@(7,0)BNNT, Dy3+@(7,0)BNNT, and Tm3+@(5,0)BNNT are suitable SIM candidates, while the other investigated complexes from this series show no signs of magnetization blocking owing to a hard competition between contributions to the crystal field of the lanthanide ion from neighboring and more distant atoms of the nanotube.
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Affiliation(s)
- Dan Liu
- School of Sciences, Great Bay University, Dongguan 523000, China
- Great Bay Institute for Advanced Study, Dongguan 523000, China
- Institute of Flexible Electronics, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, Shaanxi 710072, China
| | - Xuefeng Guo
- Institute of Flexible Electronics, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, Shaanxi 710072, China
| | - Xiaoyong Zhang
- School of Sciences, Great Bay University, Dongguan 523000, China
- Great Bay Institute for Advanced Study, Dongguan 523000, China
| | - Abdullah A Al-Kahtani
- Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Liviu F Chibotaru
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium
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2
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Adamek M, Pastukh O, Laskowska M, Karczmarska A, Laskowski Ł. Nanostructures as the Substrate for Single-Molecule Magnet Deposition. Int J Mol Sci 2023; 25:52. [PMID: 38203222 PMCID: PMC10778921 DOI: 10.3390/ijms25010052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/06/2023] [Accepted: 12/13/2023] [Indexed: 01/12/2024] Open
Abstract
Anchoringsingle-molecule magnets (SMMs) on the surface of nanostructures is gaining particular interest in the field of molecular magnetism. The accurate organization of SMMs on low-dimensional substrates enables controlled interactions and the possibility of individual molecules' manipulation, paving the route for a broad range of nanotechnological applications. In this comprehensive review article, the most studied types of SMMs are presented, and the quantum-mechanical origin of their magnetic behavior is described. The nanostructured matrices were grouped and characterized to outline to the reader their relevance for subsequent compounding with SMMs. Particular attention was paid to the fact that this process must be carried out in such a way as to preserve the initial functionality and properties of the molecules. Therefore, the work also includes a discussion of issues concerning both the methods of synthesis of the systems in question as well as advanced measurement techniques of the resulting complexes. A great deal of attention was also focused on the issue of surface-molecule interaction, which can affect the magnetic properties of SMMs, causing molecular crystal field distortion or magnetic anisotropy modification, which affects quantum tunneling or magnetic hysteresis, respectively. In our opinion, the analysis of the literature carried out in this way will greatly help the reader to design SMM-nanostructure systems.
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Affiliation(s)
| | | | - Magdalena Laskowska
- Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow, Poland; (M.A.); (O.P.); (Ł.L.)
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Kaushik K, Mehta S, Das M, Ghosh S, Kamilya S, Mondal A. Stimuli-responsive magnetic materials: impact of spin and electronic modulation. Chem Commun (Camb) 2023; 59:13107-13124. [PMID: 37846652 DOI: 10.1039/d3cc04268e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Addressing molecular bistability as a function of external stimuli, especially in spin-crossover (SCO) and metal-to-metal electron transfer (MMET) systems, has seen a surge of interest in the field of molecule-based magnetic materials due to their enormous potential in various technological applications such as molecular spintronics, memory and electronic devices, switches, sensors, and many more. The fine-tuning of molecular components allow the design and synthesis of materials with tailored properties for these vast applications. In this Feature Article, we discuss a part of our research work into this broad topic, pertaining to the recent discoveries in the field of switchable molecular magnetic materials based on SCO and MMET systems, along with some historical background of the area and related accomplishments made in recent years.
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Affiliation(s)
- Krishna Kaushik
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Sakshi Mehta
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Mayurika Das
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Sounak Ghosh
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Sujit Kamilya
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
| | - Abhishake Mondal
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India.
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4
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Liu D, Guo X, Zhang X, Al-Kahtani AA, Chibotaru LF. Single-ion magnet behavior of Ln 3+ encapsulated in carbon nanotubes: an ab initio insight. Dalton Trans 2023; 52:11243-11253. [PMID: 37526195 DOI: 10.1039/d3dt01233f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Single-molecule magnets (SMMs) have attracted large interest owing to their capability to store information at the level of a single molecule, which has great potential for applications in information technology. The key characteristic required for SMM performance is the magnetization blocking barrier, and in the last decade, impressive efforts have been made to increase its height. Herein, we report an ab initio investigation of the SMM behavior of a series of lanthanide ions (Tb3+, Dy3+, Ho3+, Er3+, Tm3+ and Yb3+) encapsulated in zigzag carbon nanotubes (CNTs) of different diameters. The results show that despite the high symmetry of the Ln environment, none of the investigated systems, except for Er3+ encapsulated in the (7,0) CNT, exhibited any blocking behavior. This is mainly attributed to the strong competition between axial and equatorial contributions to the crystal field of these encapsulated ions, resulting in weak or lack of magnetic axiality. The presented results provide useful theoretical guidance for the design of high-performance SMMs via modulating the crystal field of the ligand environment.
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Affiliation(s)
- Dan Liu
- Institute of Flexible Electronics, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072 Shaanxi, China.
| | - Xuefeng Guo
- Institute of Flexible Electronics, Northwestern Polytechnical University, 127 West Youyi Road, Xi'an, 710072 Shaanxi, China.
| | - Xiaoyong Zhang
- Institute of Systems and Physical Biology, Shenzhen Bay Laboratory, Shenzhen 518055, China
| | - Abdullah A Al-Kahtani
- Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Liviu F Chibotaru
- Theory of Nanomaterials Group, Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium.
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5
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Sodisetti VR, Lemmerer A, Wamwangi D, Bhattacharyya S. Observation of High Magnetic Bistability in Lanthanide (Ln = Gd, Tb and Dy)-Grafted Carbon Nanotube Hybrid Molecular System. Int J Mol Sci 2023; 24:12303. [PMID: 37569684 PMCID: PMC10418393 DOI: 10.3390/ijms241512303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 07/26/2023] [Accepted: 07/27/2023] [Indexed: 08/13/2023] Open
Abstract
There is an immense research interest in molecular hybrid materials posing novel magnetic properties for usage in spintronic devices and quantum technological applications. Although grafting magnetic molecules onto carbon nanotubes (CNTs) is nontrivial, there is a need to explore their single molecule magnetic (SMM) properties post-grafting to a greater degree. Here, we report a one-step chemical approach for lanthanide-EDTA (Ln = GdIII, 1; TbIII, 2 and DyIII, 3) chelate synthesis and their effective grafting onto MWCNT surfaces with high magnetic bistability retention. The magnetic anisotropy of an Ln-CNT hybrid molecular system by replacing the central ions in the hybrid complex was studied and it was found that system 1 exhibited a magnetization reversal from positive to negative values at 70 K with quasi-anti-ferromagnetic ordering, 2 showed diamagnetism to quasi-ferromagnetism and 3 displayed anti-ferromagnetic ordering as the temperature was lowered at an applied field of 200 Oe. A further analysis of magnetization (M) vs. field (H) revealed 1 displaying superparamagnetic behavior, and 2 and 3 displaying smooth hysteresis loops with zero-field slow magnetic relaxation. The present work highlights the importance of the selection of lanthanide ions in designing SMM-CNT hybrid molecular systems with multi-functionalities for building spin valves, molecular transistors, switches, etc.
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Affiliation(s)
- Venkateswara Rao Sodisetti
- Nano-Scale Transport Physics Laboratory, School of Physics, University of the Witwatersrand (Wits), Johannesburg 2050, South Africa;
| | - Andreas Lemmerer
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand (Wits), Johannesburg 2050, South Africa;
| | - Daniel Wamwangi
- DSI-NRF Centre of Excellence in Strong Materials and School of Physics, University of the Witwatersrand (Wits), Johannesburg 2050, South Africa;
| | - Somnath Bhattacharyya
- Nano-Scale Transport Physics Laboratory, School of Physics, University of the Witwatersrand (Wits), Johannesburg 2050, South Africa;
- DSI-NRF Centre of Excellence in Strong Materials and School of Physics, University of the Witwatersrand (Wits), Johannesburg 2050, South Africa;
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Hosseinzadeh M, Sanz S, van Leusen J, Izarova NV, Brechin EK, Dalgarno SJ, Kögerler P. Controlled Hydrolysis of Phosphate Esters: A Route to Calixarene-Supported Rare-Earth Clusters. Chemistry 2023; 29:e202203525. [PMID: 36453613 DOI: 10.1002/chem.202203525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 11/30/2022] [Accepted: 12/01/2022] [Indexed: 12/05/2022]
Abstract
Phosphate ester bonds are widely present in nature (e. g. DNA/RNA) and can be extremely stable against hydrolysis without the help of catalysts. Previously, we showed how the combination of phosphoryl and calix[4]arene moieties in the same organic framework (LPO ) allows isolation of single lanthanide (Ln) metal ions as [LnIII (LPO )2 ](O3 SCF3 )3 . Here we report how by controlling the reaction conditions a new hydrolyzed phosphoryl-calix[4]arene ligand (H3 LHPO ) is formed as a result of LnIII -mediated P-OEt bond cleavage in three out of the eight possible sites in LPO . The chelating nature of H3 LHPO traps the LnIII species in the form of [LnIII (LHPO )((EtO)2 P(O)OH)]2 dimers (Ln=La, Dy, Tb, Gd), where the Dy derivative shows slow magnetization relaxation. The strategy presented herein could be extended to access a broader library of hydrolyzed platforms (Hx LHPO ; x=1-8) that may represent mimics of nuclease enzymes.
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Affiliation(s)
- Marjan Hosseinzadeh
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056, Aachen, Germany
| | - Sergio Sanz
- Peter Grünberg Institute, Electronic Properties (PGI-6) Forschungszentrum Jülich, 52425, Jülich, Germany
| | - Jan van Leusen
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056, Aachen, Germany
| | - Natalya V Izarova
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056, Aachen, Germany
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, EH9 3FJ, Edinburgh, UK
| | - Scott J Dalgarno
- Institute of Chemical Sciences, Heriot-Watt University, EH14 4AS, Edinburgh, UK
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056, Aachen, Germany.,Peter Grünberg Institute, Electronic Properties (PGI-6) Forschungszentrum Jülich, 52425, Jülich, Germany
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7
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Münzfeld L, Dahlen M, Hauser A, Mahieu N, Kuppusamy SK, Moutet J, Tricoire M, Köppe R, La Droitte L, Cador O, Le Guennic B, Nocton G, Moreno-Pineda E, Ruben M, Roesky PW. Molecular Lanthanide Switches for Magnetism and Photoluminescence. Angew Chem Int Ed Engl 2023; 62:e202218107. [PMID: 36651327 DOI: 10.1002/anie.202218107] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 01/17/2023] [Accepted: 01/17/2023] [Indexed: 01/19/2023]
Abstract
Solvation of [(CNT)Ln(η8 -COT)] (Ln=La, Ce, Nd, Tb, Er; CNT=cyclononatetraenyl, i.e., C9 H9 - ; COT=cyclooctatetraendiid, i.e., C8 H8 2- ) complexes with tetrahydrofuran (THF) gives rise to neutral [(η4 -CNT)Ln(thf)2 (η8 -COT)] (Ln=La, Ce) and ionic [Ln(thf)x (η8 -COT)][CNT] (x=4 (Ce, Nd, Tb), 3 (Er)) species in a solid-to-solid transformation. Due to the severe distortion of the ligand sphere upon solvation, these species act as switchable luminophores and single-molecule magnets. The desolvation of the coordinated solvents can be triggered by applying a dynamic vacuum, as well as a temperature gradient stimulus. Raman spectroscopic investigations revealed fast and fully reversible solvation and desolvation processes. Moreover, we also show that a Nd:YAG laser can induce the necessary temperature gradient for a self-sufficient switching process of the Ce(III) analogue in a spatially resolved manner.
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Affiliation(s)
- Luca Münzfeld
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Milena Dahlen
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Adrian Hauser
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Nolwenn Mahieu
- Laboratoire de Chimie Moléculaire (LCM), UMR 9168, CNRS, Ecole Polytechnique, Institut polytechnique Paris, Route de Saclay, 91120, Palaiseau, France
| | - Senthil Kumar Kuppusamy
- Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Jules Moutet
- Laboratoire de Chimie Moléculaire (LCM), UMR 9168, CNRS, Ecole Polytechnique, Institut polytechnique Paris, Route de Saclay, 91120, Palaiseau, France
| | - Maxime Tricoire
- Laboratoire de Chimie Moléculaire (LCM), UMR 9168, CNRS, Ecole Polytechnique, Institut polytechnique Paris, Route de Saclay, 91120, Palaiseau, France
| | - Ralf Köppe
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
| | - Léo La Droitte
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35000, Rennes, France
| | - Olivier Cador
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35000, Rennes, France
| | - Boris Le Guennic
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, 35000, Rennes, France
| | - Grégory Nocton
- Laboratoire de Chimie Moléculaire (LCM), UMR 9168, CNRS, Ecole Polytechnique, Institut polytechnique Paris, Route de Saclay, 91120, Palaiseau, France
| | - Eufemio Moreno-Pineda
- Depto de Química-Física, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panamá.,Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany
| | - Mario Ruben
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Centre Européen de Science Quantique (CESQ), Institut de Science et d'Ingénierie Supramoléculaires (ISIS), UMR 7006, CNRS, Université de Strasbourg, 8 allée Gaspard Monge, BP, 70028, 67083, Strasbourg Cedex, France
| | - Peter W Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131, Karlsruhe, Germany
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Gabarró-riera G, Aromí G, Sañudo EC. Magnetic molecules on surfaces: SMMs and beyond. Coord Chem Rev 2023; 475:214858. [DOI: 10.1016/j.ccr.2022.214858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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9
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Martynov AG, Polovkova MA, Gorbunova YG, Tsivadze AY. Redox-Triggered Switching of Conformational State in Triple-Decker Lanthanide Phthalocyaninates. Molecules 2022; 27:6498. [PMID: 36235033 DOI: 10.3390/molecules27196498] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 09/24/2022] [Accepted: 09/28/2022] [Indexed: 11/17/2022]
Abstract
Double- and triple-decker lanthanide phthalocyaninates exhibit unique physical-chemical properties, particularly single-molecule magnetism. Among other factors, the magnetic properties of these sandwiches depend on their conformational state, which is determined via the skew angle of the phthalocyanine ligands. Thus, in the present work we report the comprehensive conformational study of substituted terbium(III) and yttrium(III) trisphthalocyaninates in solution depending on the substituents at the periphery of molecules, redox-states and nature of solvents. Conjunction of UV-vis-NIR spectroscopy and quantum-chemical calculations within simplified time-dependent DFT in Tamm-Dancoff approximation provided the spectroscopic signatures of staggered and gauche conformations of trisphthalocyaninates. Altogether, it allowed us to demonstrate that the butoxy-substituted complex behaves as a molecular switcher with controllable conformational state, while the crown-substituted triple-decker complex maintains a staggered conformation regardless of external factors. The analysis of noncovalent interactions within the reduced density gradient approach allowed to shed light on the nature of factors stabilizing certain conformers.
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Skachkov D, Liu SL, Chen J, Christou G, Hebard AF, Zhang XG, Trickey SB, Cheng HP. Dipole Switching by Intramolecular Electron Transfer in Single-Molecule Magnetic Complex [Mn 12O 12(O 2CR) 16(H 2O) 4]. J Phys Chem A 2022; 126:5265-5272. [PMID: 35939333 DOI: 10.1021/acs.jpca.2c02585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We study intramolecular electron transfer in the single-molecule magnetic complex [Mn12O12(O2CR)16 (H2O)4] for R = -H, -CH3, -CHCl2, -C6H5, and -C6H4F ligands as a mechanism for switching of the molecular dipole moment. Energetics is obtained using the density functional theory (DFT) with onsite Coulomb energy correction (DFT + U). Lattice distortions are found to be critical for localizing an extra electron on one of the easy sites on the outer ring in which localized states can be stabilized. We find that the lowest-energy path for charge transfer is for the electron to go through the center via superexchange-mediated tunneling. The energy barrier for such a path ranges from 0.4 to 54 meV depending on the ligands and the isomeric form of the complex. The electric field strength needed to move the charge from one end to the other, thus reversing the dipole moment, is 0.01-0.04 V/Å.
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Affiliation(s)
- Dmitry Skachkov
- The M2QM Center and the Quantum Theory Project, Department of Physics, University of Florida, Gainesville, Florida 32611, United States
| | - Shuang-Long Liu
- The M2QM Center and the Quantum Theory Project, Department of Physics, University of Florida, Gainesville, Florida 32611, United States
| | - Jia Chen
- The M2QM Center and the Quantum Theory Project, Department of Physics, University of Florida, Gainesville, Florida 32611, United States
| | - George Christou
- The M2QM Center, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Arthur F Hebard
- The M2QM Center, Department of Physics, University of Florida, Gainesville, Florida 32611, United States
| | - Xiao-Guang Zhang
- The M2QM Center and the Quantum Theory Project, Department of Physics, University of Florida, Gainesville, Florida 32611, United States
| | - Samuel B Trickey
- The M2QM Center and the Quantum Theory Project, Department of Physics, University of Florida, Gainesville, Florida 32611, United States
| | - Hai-Ping Cheng
- The M2QM Center and the Quantum Theory Project, Department of Physics, University of Florida, Gainesville, Florida 32611, United States
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Abstract
Spintronics, a flourishing new field of microelectronics, uses the electron spin for reading and writing information in modern computers and other spintronic devices with a low power consumption and high reliability. In a quest to increase the productivity of such devices, the use of molecular materials as a spacer layer allowed them to perform equally well or even better than conventional all-inorganic heterostructures from metals, alloys, or inorganic semiconductors. In this review, we survey various classes of chemical compounds that have already been tested for this purpose─from organic compounds and coordination complexes to organic-inorganic hybrid materials─since the creation of the first molecule-based spintronic device in 2002. Although each class has its advantages, drawbacks, and applications in molecular spintronics, together they allowed nonchemists to gain insights into spin-related effects and to propose new concepts in the design and fabrication of highly efficient spintronic devices. Other molecular compounds that chemistry could offer in great numbers may soon emerge as suitable spacers or even electrodes in flexible magnetic field sensors, nonvolatile memories, and multifunctional spintronic devices.
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Affiliation(s)
- Ivan S Zlobin
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, Moscow 119991, Russia.,Moscow Institute of Physics and Technology (National Research University), Institutskiy Per. 9, Dolgoprudny, Moscow Region 141700, Russia
| | - Yulia V Nelyubina
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, Moscow 119991, Russia.,Moscow Institute of Physics and Technology (National Research University), Institutskiy Per. 9, Dolgoprudny, Moscow Region 141700, Russia
| | - Valentin V Novikov
- A.N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, Moscow 119991, Russia.,Moscow Institute of Physics and Technology (National Research University), Institutskiy Per. 9, Dolgoprudny, Moscow Region 141700, Russia
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12
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Gupta A, Kapurwan S, Prasad Bera S, Jyoti Mondal D, Shome S, Konar S. Heterometallic Hexanuclear [Cu 2 Ln 4 ] Complexes Showing Zero-field SMM Behaviour and Magnetocaloric Effect. Chem Asian J 2022; 17:e202200622. [PMID: 35726858 DOI: 10.1002/asia.202200622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Indexed: 11/10/2022]
Abstract
Three heterometallic hexanuclear 3d-4f complexes bearing the formula [Cu2 (L)2 Ln4 (L)4 (o-van)2 ] [L=2-((E)-((2-hydroxyphenyl)imino]methyl)phenol; o-van=ortho-vanillin] (LnIII =GdIII (1), DyIII (2), and TbIII (3)) have been synthesized and characterized. DC magnetic susceptibility measurements reveal overall antiferromagnetic interactions in 1 and 3, whereas co-existence of ferro- as well as antiferromagnetic interactions were observed in 2. The magnetocaloric effect has been observed for 1 with an entropy change (-ΔSm ) of 22.3 J kg-1 K-1 at 3 K and 7 T. Zero-field single molecule magnet (SMM) behaviour has been observed for 2, where Raman relaxation and quantum tunneling of magnetization (QTM) played a role in magnetization relaxation. The Cu-O-Ln angle well explains the magnetic exchange coupling occurring in the complexes. BS-DFT calculation for the complexes provides an estimate of the exchange interactions between the paramagnetic centres. Ab initio calculations performed for complex 2 established a good correlation to the experimental relaxation dynamics.
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Affiliation(s)
- Arindam Gupta
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Sandhya Kapurwan
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Siba Prasad Bera
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Dibya Jyoti Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Shraoshee Shome
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
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13
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Pathak S, Ghosh MK, Ghorai TK. Crystal designing and magneto-chemical characterization of unusual nickel(II) MOFs. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Abstract
Abstract
The thermal sublimation of the known cage iron(II) complex (clathrochelate) gives thin films of this compound on various supports without violating its integrity as shown by electron spectroscopy. The spin state of the complex remains unchanged compared to the polycrystalline sample and solution. The first prototypes of molecular spintronic devices in the form of a vertical spin valve are prepared from the chosen iron(II) clathrochelate, and their electron transport properties are studied.
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15
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Paschke F, Birk T, Avdoshenko SM, Liu F, Popov AA, Fonin M. Imaging the Single-Electron Ln-Ln Bonding Orbital in a Dimetallofullerene Molecular Magnet. Small 2022; 18:e2105667. [PMID: 34862728 DOI: 10.1002/smll.202105667] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Indexed: 06/13/2023]
Abstract
Chemically robust single-molecule magnets (SMMs) with sufficiently high blocking temperatures TB are among the key building blocks for the realization of molecular spintronic or quantum computing devices. Such device applications require access to the magnetic system of a SMM molecule by means of electronic transport, which primarily depends on the interaction of magnetic orbitals with the electronic states of the metallic electrodes. Scanning tunneling microscopy in combination with ab initio calculations allows to directly address the unoccupied component of the single-electron molecular orbital that mediates the ferromagnetic exchange coupling between two 4f ions within a lanthanide endohedral dimetallofullerene deposited on a graphene surface. The single-electron metal-metal bond provides a direct access to the molecule's magnetic system in the transport experiments, paving the way for investigation and controlled manipulation of the spin system of individual dimetallofullerene SMMs, essential for molecular spintronics.
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Affiliation(s)
- Fabian Paschke
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Tobias Birk
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Stanislav M Avdoshenko
- Institute for Solid State Research, Leibniz Institute for Solid State and Materials Research (IFW Dresden), 01069, Dresden, Germany
| | - Fupin Liu
- Institute for Solid State Research, Leibniz Institute for Solid State and Materials Research (IFW Dresden), 01069, Dresden, Germany
| | - Alexey A Popov
- Institute for Solid State Research, Leibniz Institute for Solid State and Materials Research (IFW Dresden), 01069, Dresden, Germany
| | - Mikhail Fonin
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
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16
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Jiao Y, Sanz S, Izarova NV, van Leusen J, Sarwar S, Dalgarno S, Brechin EK, Kögerler P. Hybrid lanthanide double-deckers based on calixarene and polyoxometalate units. Dalton Trans 2022; 51:5409-5413. [DOI: 10.1039/d2dt00769j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complementarity of calixarene (H2L) and polyoxometalate ligands results in the first organic-inorganic [M(III)L{Mo5O13(OMe)4(NO)}]2– (M = Y, Gd and Dy) hybrid, directing the formation of a distorted square-antiprismatic MO8 ligand field,...
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17
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Martynov AG, Horii Y, Katoh K, Bian Y, Jiang J, Yamashita M, Gorbunova YG. Rare-earth based tetrapyrrolic sandwiches: chemistry, materials and applications. Chem Soc Rev 2022; 51:9262-9339. [DOI: 10.1039/d2cs00559j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review summarises advances in chemistry of tetrapyrrole sandwiches with rare earth elements and highlights the current state of their use in single-molecule magnetism, organic field-effect transistors, conducting materials and nonlinear optics.
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Affiliation(s)
- Alexander G. Martynov
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Leninskiy pr., 31, bldg.4, Moscow, Russia
| | - Yoji Horii
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630-8506, Japan
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Josai University, 1-1 Keyakidai, Sakado, Saitama 350-0295, Japan
| | - Yongzhong Bian
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China
- Daxing Research Institute, and Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China
| | - Jianzhuang Jiang
- Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, China
- Daxing Research Institute, and Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, China
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-Ku, Sendai 980-8578, Japan
| | - Yulia G. Gorbunova
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071, Leninskiy pr., 31, bldg.4, Moscow, Russia
- N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Leninskiy pr., 31, Moscow, Russia
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18
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Moreno-Da Silva S, Martínez JI, Develioglu A, Nieto-Ortega B, de Juan-Fernández L, Ruiz-Gonzalez L, Picón A, Oberli S, Alonso PJ, Moonshiram D, Pérez EM, Burzurí E. Magnetic, Mechanically Interlocked Porphyrin-Carbon Nanotubes for Quantum Computation and Spintronics. J Am Chem Soc 2021; 143:21286-21293. [PMID: 34825564 DOI: 10.1021/jacs.1c07058] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Atomic-scale reproducibility and tunability endorse magnetic molecules as candidates for spin qubits and spintronics. A major challenge is to implant those molecular spins into circuit geometries that may allow one, two, or a few spins to be addressed in a controlled way. Here, the formation of mechanically bonded, magnetic porphyrin dimeric rings around carbon nanotubes (mMINTs) is presented. The mechanical bond places the porphyrin magnetic cores in close contact with the carbon nanotube without disturbing their structures. A combination of spectroscopic techniques shows that the magnetic geometry of the dimers is preserved upon formation of the macrocycle and the mMINT. Moreover, the metallic core selection determines the spin location in the mMINT. The suitability of mMINTs as qubits is explored by measuring their quantum coherence times (Tm). Formation of the dimeric ring preserves the Tm found in the monomer, which remains in the μs scale for mMINTs. The carbon nanotube is used as vessel to place the molecules in complex circuits. This strategy can be extended to other families of magnetic molecules. The size and composition of the macrocycle can be tailored to modulate magnetic interactions between the cores and to introduce magnetic asymmetries (heterometallic dimers) for more complex molecule-based qubits.
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Affiliation(s)
| | - Jesús I Martínez
- Instituto de Nanociencia y Materiales de Aragón (INMA), Universidad de Zaragoza and CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Aysegul Develioglu
- IMDEA Nanociencia, Campus de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain
| | - Belén Nieto-Ortega
- IMDEA Nanociencia, Campus de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain
| | | | - Luisa Ruiz-Gonzalez
- Departamento de Química Inorgánica, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Antonio Picón
- Departamento de Química, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Soléne Oberli
- Departamento de Química, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Pablo J Alonso
- Instituto de Nanociencia y Materiales de Aragón (INMA), Universidad de Zaragoza and CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Dooshaye Moonshiram
- IMDEA Nanociencia, Campus de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain
| | - Emilio M Pérez
- IMDEA Nanociencia, Campus de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain
| | - Enrique Burzurí
- IMDEA Nanociencia, Campus de Cantoblanco, Calle Faraday 9, 28049 Madrid, Spain.,Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049 Madrid, Spain
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19
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Abstract
Two diradical complexes of the formula [LnRad2(CF3SO3)3] c (Ln(III) = Dy, Eu, Rad = 4,4-dimethyl-2,2-bis(pyridin-2-yl)-1,3-oxazolidine-3-oxyl) were obtained in air conditions. These are the first examples of diradical compounds of lanthanides and oxazolidine nitroxide. The complexes were characterized crystallographically and magnetically. Single crystal XRD analysis revealed that their coordination sphere is composed of three monodentate triflates and two tripodal Rad, which coordinate the central atom in a tridentate manner via two N atoms of the pyridine groups and the O atom of a nitroxide group. The LnO5N4 polyhedron represents a spherical capped square antiprism with point symmetry close to C4v. The data of static magnetic measurements are compatible with the presence of two paramagnetic ligands in the coordination sphere of the metal.
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20
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Nabi R, Tiwari RK, Rajaraman G. In silico strategy to boost stability, axiality, and barrier heights in dysprocenium SIMs via SWCNT encapsulation. Chem Commun (Camb) 2021; 57:11350-11353. [PMID: 34643193 DOI: 10.1039/d1cc03434k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Detailed ab initio CASSCF calculations coupled with periodic DFT studies on a series of [Dy(Cp)2]+ molecules encapsulated in a single-wall carbon nanotube found that encapsulation offers stability to these fragile molecules and also significantly enhances the Ueff values. Most importantly, this encapsulation suppresses the key vibrations responsible for reducing the blocking temperature, offering a hitherto unknown strategy for a new generation of SIM-based devices.
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Affiliation(s)
- Rizwan Nabi
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Rupesh Kumar Tiwari
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
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21
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Paschke F, Birk T, Enenkel V, Liu F, Romankov V, Dreiser J, Popov AA, Fonin M. Exceptionally High Blocking Temperature of 17 K in a Surface-Supported Molecular Magnet. Adv Mater 2021; 33:e2102844. [PMID: 34396601 DOI: 10.1002/adma.202102844] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 06/09/2021] [Indexed: 06/13/2023]
Abstract
Single-molecule magnets (SMMs) are among the most promising building blocks for future magnetic data storage or quantum computing applications, owing to magnetic bistability and long magnetic relaxation times. The practical device integration requires realization of 2D surface assemblies of SMMs, where each magnetic unit shows magnetic relaxation being sufficiently slow at application-relevant temperatures. Using X-ray absorption spectroscopy and X-ray magnetic circular dichroism, it is shown that sub-monolayers of Dy2 @C80 (CH2 Ph) dimetallofullerenes prepared on graphene by electrospray deposition exhibit magnetic behavior fully comparable to that of the bulk. Magnetic hysteresis and relaxation time measurements show that the magnetic moment remains stable for 100 s at 17 K, marking the blocking temperature TB(100) , being not only in excellent agreement with that of the bulk sample but also representing by far the highest one detected for a surface-supported single-molecule magnet. The reported findings give a boost to the efforts to stabilize and address the spin degree of freedom in molecular magnets aiming at the realization of SMM-based spintronic units.
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Affiliation(s)
- Fabian Paschke
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Tobias Birk
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Vivien Enenkel
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), 01069, Dresden, Germany
| | - Vladyslav Romankov
- Swiss Light Source, Paul Scherrer Institute, Villigen, 5232, Switzerland
| | - Jan Dreiser
- Swiss Light Source, Paul Scherrer Institute, Villigen, 5232, Switzerland
| | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research (IFW Dresden), 01069, Dresden, Germany
| | - Mikhail Fonin
- Department of Physics, University of Konstanz, 78457, Konstanz, Germany
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22
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Huang X, Wang K, Han J, Xie J, Li L, Sutter JP. A metal-radical hetero-tri-spin SCM with methyl-pyrazole-nitronyl nitroxide bridges. Dalton Trans 2021; 50:11992-11998. [PMID: 34378596 DOI: 10.1039/d1dt02006d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The preparation, crystal structures, and magnetic properties of a family of hetero-tri-spin 1-D coordination polymers with the formula [Ln(hfac)3Cu(hfac)2(4-NIT-MePyz)2] (Ln = Gd, 1, Tb, 2, Dy, 3; hfac = hexafluoroacetylacetonate; 4-NIT-MePyz = 2-{4-(1-methyl)-pyrazolyl}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) are reported. In these complexes, the 4-NIT-MePyz radical acts as a linker to bridge the CuII and LnIII ions through its pyrazole and aminoxyl groups to form a chain structure. Magnetic properties typical of spin-chains are observed for Dy and Tb derivatives but single-chain magnet (SCM) behavior was evidenced only for the Tb compound which is characterized by an energy gap for demagnetization Δτ/kB of 31 K.
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Affiliation(s)
- Xiaohui Huang
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
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23
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Abstract
Theoretical calculation plays an important role in the emerging field of single-molecule magnets (SMMs). It can not only explain experimental phenomena but also provide synthetic guidance. This review focuses on discussing the computational methods that have been used in this field in recent years. The most common and effective method is the complete active space self-consistent field (CASSCF) approach, which predicts mononuclear SMM property very well. For bi- and multi-nuclear SMMs, magnetic exchange needs to be considered, and the exchange coupling constants can be obtained by Monte Carlo (MC) simulation, ab initio calculation via the POLY_ANISO program and density functional theory combined with a broken-symmetry (DFT-BS) approach. Further application for these calculation methods to design high performance SMMs is also discussed.
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24
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Jing P, Xi L, Lu J, Han J, Huang X, Jin C, Xie J, Li L. Regulating Spin Dynamics of Nitronyl Nitroxide Biradical Lanthanide Complexes through Introducing Different Transition Metals. Chem Asian J 2021; 16:793-800. [PMID: 33590716 DOI: 10.1002/asia.202100062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 02/14/2021] [Indexed: 11/05/2022]
Abstract
Four biradical-Ln complexes with different transition metal ions, namely [LnM(hfac)5 (NITPh-PyPzbis)] (MII =MnII and LnIII =Gd 1, Dy 2; MII =NiII and LnIII =Tb 3, Dy 4), were prepared by the reaction of Ln(hfac)3 ⋅ 2H2 O, Mn(hfac)2 ⋅ 2H2 O or Ni(hfac)2 ⋅ 2H2 O with NITPh-PyPzbis biradical (hfac=hexafluoroacetylacetonate, NITPh-PyPzbis=5-(3-(2-pyridinyl)-1H-pyrazol-1-yl)-1,3-bis(1'-oxyl-3'-oxido- 4',4',5',5'-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene). In complexes 1-4, the NITPh-PyPzbis biradical chelates one LnIII ion by means of its aminoxyl moieties and the transition metal ion is introduced through the two N donors from the pyridyl pyrazolyl moiety. Magnetic investigations indicate that complex 4 displays visible maxima in frequency/temperature-dependent χ'' signals with two-step relaxation processes, but complex 2 exhibits no slow magnetization relaxation. The comparison of structure parameters of both Dy complexes indicates that the symmetries of coordination spheres of two Dy ions are D2d for 2 and C2v for 4, which thus probably results in different magnetic relaxation behaviors. This work provides new insight for improving properties of Ln-biradical based SMMs.
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Affiliation(s)
- Pei Jing
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R China
| | - Lu Xi
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R China
| | - Jiao Lu
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R China
| | - Jing Han
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R China
| | - Xiaohui Huang
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R China
| | - Chaoyi Jin
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R China
| | - Junfang Xie
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R China
| | - Licun Li
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R China
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25
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Xia J, Guo J, Zhang X, Lan M, Wen J, Wang S, He Y, Xiang G, Corrias A, Boi FS. Anomalous stepped-hysteresis and T-induced unit-cell-volume reduction in carbon nanotubes continuously filled with faceted Fe3C nanowires. Nano Ex 2021. [DOI: 10.1088/2632-959x/abe605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
Ferromagnetically-filled carbon nanotubes have been recently considered important candidates for application into data recording quantum disk devices. Achievement of high filling rates of the ferromagnetic materials is particularly desirable for applications. Here we report the novel observation of carbon nanotubes continuously filled along the capillary with unusual μm-long faceted Fe3C nanowires. Anomalous magnetic features possibly due to strain effects of the crystal facets are reported. Magnetization measurements revealed unusual stepped magnetic hysteresis-loops at 300 K and at 2 K together with an anomalous decrease in the coercivity at low temperature. The observed unusual shape of the hysteresis is ascribed to the existence of an antiferromagnetic transition within or at the boundary of the ferromagnetic facets. The collapse in the coercivity value as the temperature decreases and the characteristic width-enhancement of the hysteresis with the field increasing appear to indicate the existence of layered antiferromagnetic phases, possibly in the strain-rich regions of the nanowire facets. Zero field cooled (ZFC) and field cooled (FC) magnetic curves evidenced presence of magnetic irreversibilities, an indicator of a possible spin-glass-like behavior induced by competing antiferromagnetic and ferromagnetic interactions. Characterization performed with low temperature XRD measurements, further revealed a slight variation in the average Fe3C unit cell parameters, suggesting the absence of additional unit-cell volume induced ferromagnetic transitions at low temperature.
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26
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Mosse IS, Sodisetti VR, Coleman C, Ncube S, de Sousa AS, Erasmus RM, Flahaut E, Blon T, Lassagne B, Šamořil T, Bhattacharyya S. Tuning Magnetic Properties of a Carbon Nanotube-Lanthanide Hybrid Molecular Complex through Controlled Functionalization. Molecules 2021; 26:563. [PMID: 33498976 DOI: 10.3390/molecules26030563] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/01/2021] [Accepted: 01/11/2021] [Indexed: 11/17/2022] Open
Abstract
Molecular magnets attached to carbon nanotubes (CNT) are being studied as potential candidates for developing spintronic and quantum technologies. However, the functionalization routes used to develop these hybrid systems can drastically affect their respective physiochemical properties. Due to the complexity of this systems, little work has been directed at establishing the correlation between the degree of functionalization and the magnetic character. Here, we demonstrate the chemical functionalization degree associated with molecular magnet loading can be utilized for controlled tuning the magnetic properties of a CNT-lanthanide hybrid complex. CNT functionalization degree was evaluated by interpreting minor Raman phonon modes in relation to the controlled reaction conditions. These findings were exploited in attaching a rare-earth-based molecular magnet (Gd-DTPA) to the CNTs. Inductively coupled plasma mass spectrometry, time-of-flight secondary ion mass spectrometry and super conducting quantum interference device (SQUID) measurements were used to elucidate the variation of magnetic character across the samples. This controlled Gd-DTPA loading on the CNT surface has led to a significant change in the nanotube intrinsic diamagnetism, showing antiferromagnetic coupling with increase in the Weiss temperature with respect to increased loading. This indicates that synthesis of a highly correlated spin system for developing novel spintronic technologies can be realized through a carbon-based hybrid material.
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27
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Jiao Y, Sarwar S, Sanz S, van Leusen J, Izarova NV, Campbell CL, Brechin EK, Dalgarno SJ, Kögerler P. Exploiting complementary ligands for the construction of square antiprismatic monometallic lanthanide SMMs. Dalton Trans 2021; 50:9648-9654. [PMID: 34160497 DOI: 10.1039/d1dt00359c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The methylation of p-tert-butylcalix[4]arene in the distal 1,3-phenolic sites provides the ligand H2L = {p-tert-butylcalix[4](OMe)2(OH)2arene} that enables construction of heteroleptic mononuclear lanthanide complexes. The reaction of (N(nBu)4)(acac) (Hacac = acetylacetone), MIIICl3 and H2L under Schlenk conditions results in the formation of a family of (N(nBu)4)[MIIIL(acac)2] complexes where M = Y (1), Gd (2), Tb (3) and Dy (4). The metal ions are eight-coordinate in distorted square-antiprismatic coordination geometries, resulting in slow relaxation of the magnetisation for the Tb derivative.
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Affiliation(s)
- Yushu Jiao
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, Germany.
| | - Sidra Sarwar
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, Germany. and Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany.
| | - Sergio Sanz
- Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany. and Jülich-Aachen Research Alliance, Fundamentals for Future Information Technology (JARA-FIT), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Jan van Leusen
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, Germany.
| | - Natalya V Izarova
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, Germany. and Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany.
| | - Cameron L Campbell
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Scott J Dalgarno
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, UK.
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University, 52056 Aachen, Germany. and Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany. and Jülich-Aachen Research Alliance, Fundamentals for Future Information Technology (JARA-FIT), Forschungszentrum Jülich, 52425 Jülich, Germany
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28
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Hosseinzadeh M, Sanz S, van Leusen J, Izarova NV, Brechin EK, Dalgarno SJ, Kögerler P. Phosphorylated-calix[4]arene double-deckers of single rare earth metal ions. Chem Commun (Camb) 2021; 57:8087-8090. [PMID: 34304255 DOI: 10.1039/d1cc02910j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Combination of phosphoryl and calix[4]arene moieties in the same organic framework (LPO) directs the formation of homoleptic double-decker complexes [LnIII(LPO)2](OTf)3 for Ln = Tb and Dy, with the latter displaying slow relaxation of the magnetisation.
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Affiliation(s)
- Marjan Hosseinzadeh
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52056, Germany.
| | - Sergio Sanz
- Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, Jülich 52425, Germany and Jülich-Aachen Research Alliance, Fundamentals for Future Information Technology (JARA-FIT), Forschungszentrum Jülich, Jülich 52425, Germany
| | - Jan van Leusen
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52056, Germany.
| | - Natalya V Izarova
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52056, Germany. and Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, Jülich 52425, Germany
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ, UK.
| | - Scott J Dalgarno
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH144AS, UK.
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University, Aachen 52056, Germany. and Peter Grünberg Institute, Electronic Properties (PGI-6), Forschungszentrum Jülich, Jülich 52425, Germany and Jülich-Aachen Research Alliance, Fundamentals for Future Information Technology (JARA-FIT), Forschungszentrum Jülich, Jülich 52425, Germany
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29
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Sun J, Wu Q, Lu J, Jing P, Du Y, Li L. Slow relaxation of magnetization in lanthanide-biradical complexes based on a functionalized nitronyl nitroxide biradical. Dalton Trans 2020; 49:17414-17420. [PMID: 33216082 DOI: 10.1039/d0dt03312j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Three novel lanthanide-biradical complexes {[Ln(hfac)3]2(mbisNITPyPh)(H2O)}{[Ln(hfac)3](mbisNITPyPh)}·CHCl3 (1-Gd; 2-Tb; 3-Dy) were successfully achieved by reacting the biradical mbisNITPyPh (5-(3-pyridyl)-1,3-bis(1-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene) with Ln(hfac)3·2H2O (hfac = hexafluoroacetylacetonate). These Ln-biradical complexes consist of two kinds of spin moieties, namely, dinuclear {[Ln(hfac)3]2(mbisNITPyPh)(H2O)} and mononuclear {[Ln(hfac)3](mbisNITPyPh)}, in which two adjacent dinuclear units are linked by intermolecular hydrogen bonds involving the uncoordinated nitroxide units and the coordinated water molecules of Ln ions, forming a cyclic tetranuclear structure unit. The magnetization study reveals that intramolecular Ln(iii)-coordinated NO ferromagnetic interactions are dominant in the present system. Moreover, the clear frequency dependence of ac magnetic susceptibilities of complex 3-Dy is indicative of slow relaxation of magnetization behavior, indicating its single-molecule magnet nature.
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Affiliation(s)
- Juan Sun
- Hubei Key Laboratory of Pollutant Analysis & Reuse Technology, College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, P. R. China.
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30
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Affiliation(s)
- Guy Cohen
- The Raymond and Beverley Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel
- School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel
| | - Michael Galperin
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, USA
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31
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Monakhov KY, Wernsdorfer W. A cubane-type nickel single-molecule magnet with exchange-biased quantum tunneling of magnetization. Mendeleev Communications 2020. [DOI: 10.1016/j.mencom.2020.03.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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32
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Duan YY, Wu DF, Chen HH, Wang YJ, Li L, Gao HL, Cui JZ. New dinuclear compounds of dysprosium and erbium constructed by an O-vanillin ligand and β-diketonate coligand: Synthesis, near-Infrared luminescent and magnetism. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2019.119203] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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33
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Abstract
New nitronyl nitroxide biradical-bridged 3d–4f chains have been constructed in which improved SCM behavior is observed.
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Affiliation(s)
- Juan Sun
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Jing Xie
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Licun Li
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Jean-Pascal Sutter
- Laboratoire de Chimie de Coordination du CNRS (LCC-CNRS) Université de Toulouse
- CNRS
- Toulouse
- France
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34
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Sarwar S, Sanz S, van Leusen J, Nichol GS, Brechin EK, Kögerler P. Phthalocyanine-polyoxotungstate lanthanide double deckers. Dalton Trans 2020; 49:16638-16642. [DOI: 10.1039/d0dt03716h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Two archetypal tetradentate ligands with square donor patterns, namely phthalocyanate and monolacunary Keggin-type polyoxotungstate, coordinate to rare earth ions to yield Cs-symmetric heteroleptic double-decker complexes.
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Affiliation(s)
- Sidra Sarwar
- Institute of Inorganic Chemistry
- RWTH Aachen University
- 52056 Aachen
- Germany
- Peter Grünberg Institute
| | - Sergio Sanz
- Peter Grünberg Institute
- 52425 Jülich
- Germany
- Jülich-Aachen Research Alliance
- Fundamentals for Future Information Technology (JARA-FIT)
| | - Jan van Leusen
- Institute of Inorganic Chemistry
- RWTH Aachen University
- 52056 Aachen
- Germany
| | - Gary S. Nichol
- EaStCHEM School of Chemistry
- The University of Edinburgh
- Edinburgh
- UK
| | - Euan K. Brechin
- EaStCHEM School of Chemistry
- The University of Edinburgh
- Edinburgh
- UK
| | - Paul Kögerler
- Institute of Inorganic Chemistry
- RWTH Aachen University
- 52056 Aachen
- Germany
- Peter Grünberg Institute
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35
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Wang K, Sun J, Xi L, Lu J, Jing P, Li L. Heterometallic Ln-Cu complexes derived from a phenyl pyrimidyl substituted nitronyl nitroxide biradical. Dalton Trans 2019; 48:14383-14389. [PMID: 31508636 DOI: 10.1039/c9dt03081f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Utilizing a novel nitronyl nitroxide biradical bisNITPhPyrim involving a pyrimidine group ([5-(5-pyrimidyl)-1,3-bis(1'-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4,5-hydro-1H-imidazol-2-yl)]benzene), three heterometallic Ln-Cu complexes with formulas [Ln(hfac)3Cu(hfac)2(bisNITPhPyrim)] (LnIII = Gd 1, Tb 2, and Dy 3; hfac = hexafluoroacetylacetonate) have been achieved. In these complexes, the CuII ions are linked by N atoms of pyrimidine rings of bisNITPhPyrim radicals to form a one-dimensional chain structure, whereas each LnIII ion is chelated with two neighboring NO groups of two NIT moieties of the radical. Magnetic studies reveal the presence of ferromagnetic interactions between the GdIII ion and coordinated NO groups, and between the pyrimidine-bridged copper(ii) spins, which are quantified by a magnetic model, giving J1 = 4.20 cm-1 and J3 = 0.50 cm-1 (J1 and J3 are magnetic exchanges for GdIII-ON and CuII-CuII, respectively). Interestingly, ac magnetic measurements show that complex 3 exhibits slow relaxation of the magnetization.
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Affiliation(s)
- Kang Wang
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin 300071, China.
| | - Juan Sun
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin 300071, China.
| | - Lu Xi
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin 300071, China.
| | - Jiao Lu
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin 300071, China.
| | - Pei Jing
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin 300071, China.
| | - Licun Li
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, Nankai University, Tianjin 300071, China.
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36
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Abd El-Mageed AIA, Ogawa T. Supramolecular structures of terbium(iii) porphyrin double-decker complexes on a single-walled carbon nanotube surface. RSC Adv 2019; 9:28135-28145. [PMID: 35530484 PMCID: PMC9071046 DOI: 10.1039/c9ra05818d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 08/31/2019] [Indexed: 11/21/2022] Open
Abstract
This work mainly reports the observation of novel supramolecular structures of TbIII-5,15-bisdodecylporphyrin (BDP, C12P) double-decker complexes on the surfaces of single-walled carbon nanotubes (SWNTs) performed by scanning tunneling microscopy under an ultra-high vacuum and low temperature, atomic force microscopy, scanning electron microscopy coupled with energy dispersive spectroscopy, and ultraviolet-visible spectroscopy. The molecules formed a well-ordered self-assembled helix-shaped array with regular periodicity on the tube surface. Additionally, some magnetic properties of the BDP-molecule as well as the resulting BDP-SWNT composites were investigated by superconducting quantum interference measurements. The molecule exhibits single-molecule magnetic (SMM) properties and the composite's magnetization increases almost linearly with decreasing temperature which is possibly due to the coupling between porphyrin molecules and SWNTs. Consequently, this may enable the development of more advanced spintronic devices based on porphyrin-nanocarbon composites. For the first time, using scanning probe microscopy, the supramolecular structures of terbium porphyrin double-decker complexes were observed on single-walled carbon nanotubes surfaces, where the molecules formed a well-ordered self-assembled array.![]()
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Affiliation(s)
- Ahmed I A Abd El-Mageed
- Chemistry Department, Graduate School of Science, Osaka University Machikaneyama 1-1 Toyonaka Osaka 560-0043 Japan .,Chemistry Department, Faculty of Science, Minia University Minia 61519 Egypt
| | - Takuji Ogawa
- Chemistry Department, Graduate School of Science, Osaka University Machikaneyama 1-1 Toyonaka Osaka 560-0043 Japan
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37
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Wang K, Zhang J, Lu J, Jing P, Li L. Slow magnetic relaxation in Cu-Ln heterometallic Schiff base complexes containing Ln(hfac)4− as counterions. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.02.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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38
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Shukla P, Metre RK, Du MH, Kong XJ, Das S. [5×1 + 1×1] Hexanuclear Lanthanide(III) Cocrystal Complexes: Syntheses, Structures, and Magnetic Properties. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900163] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Pooja Shukla
- Department of Chemistry; Institute of Infrastructure Technology Research and Management; 380026 India
| | - Ramesh K. Metre
- Department of Chemistry; Indian Institute of Technology Jodhpur; 342037 India
| | - Ming-Hao Du
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering; Xiamen University; 361005 China
| | - Xiang-Jian Kong
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering; Xiamen University; 361005 China
| | - Sourav Das
- Department of Chemistry; Institute of Infrastructure Technology Research and Management; 380026 India
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39
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Sakaguchi Y, Kizaki K, Fuyuhiro A, Fukuda T, Ishikawa N. System Composed of Three Types of Electronic Angular Momenta: A J-S-L Triad in a Photoexcited π-Radical Bis(phthalocyaninato)terbium Single-Molecule Magnet. Inorg Chem 2018; 57:15438-15444. [PMID: 30495937 DOI: 10.1021/acs.inorgchem.8b02743] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Interactions of three different types of electronic angular momenta, namely, spin, orbital, and total angular momenta from different origins in a photoexcited neutral bis(phthalocyaninato)terbium single-molecule magnet (Pc2Tb, where Pc2- denotes a phthalocyaninato anion) have been studied. We have conducted varied-temperature and varied-magnetic-field magnetic circular dichroism (MCD) measurements on the highest occupied molecular orbital-lowest unoccupied molecular orbital electronic transition in the ligand side of the neutral Pc2Tb to reveal the quantum nature of the system composed of a π-radical with a spin angular momentum S, the 4f system with a total angular momentum J, and the cyclic π conjugate system with a photoinduced orbital angular momentum L. We have constructed a new theoretical model that gives a quantitative agreement to the temperature and magnetic field dependence of MCD. The theoretical analysis revealed that the system takes eight quantum states that can be expressed as | J z S z L z⟩ = |±±±⟩, where the three angular momenta are quantized along the fourfold symmetry axis. Thus, we have identified the existence of the magnetic interactions among the three angular momenta and quantitatively determined their magnitudes for the first time.
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Affiliation(s)
- Yutaro Sakaguchi
- Department of Chemistry, Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan
| | - Kazuro Kizaki
- Department of Chemistry, Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan
| | - Akira Fuyuhiro
- Department of Chemistry, Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan
| | - Takamitsu Fukuda
- Department of Chemistry, Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan
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40
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Randall McClain K, Gould CA, Chakarawet K, Teat SJ, Groshens TJ, Long JR, Harvey BG. High-temperature magnetic blocking and magneto-structural correlations in a series of dysprosium(iii) metallocenium single-molecule magnets. Chem Sci 2018; 9:8492-8503. [PMID: 30568773 PMCID: PMC6256727 DOI: 10.1039/c8sc03907k] [Citation(s) in RCA: 303] [Impact Index Per Article: 50.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Accepted: 10/18/2018] [Indexed: 01/08/2023] Open
Abstract
A series of dysprosium(iii) metallocenium salts, [Dy(CpiPr4R)2][B(C6F5)4] (R = H (1), Me (2), Et (3), iPr (4)), was synthesized by reaction of DyI3 with the corresponding known NaCpiPr4R (R = H, iPr) and novel NaCpiPr4R (R = Me, Et) salts at high temperature, followed by iodide abstraction with [H(SiEt3)2][B(C6F5)4]. Variation of the substituents in this series results in substantial changes in molecular structure, with more sterically-encumbering cyclopentadienyl ligands promoting longer Dy-C distances and larger Cp-Dy-Cp angles. Dc and ac magnetic susceptibility data reveal that these structural changes have a considerable impact on the magnetic relaxation behavior and operating temperature of each compound. In particular, the magnetic relaxation barrier increases as the Dy-C distance decreases and the Cp-Dy-Cp angle increases. An overall 45 K increase in the magnetic blocking temperature is observed across the series, with compounds 2-4 exhibiting the highest 100 s blocking temperatures yet reported for a single-molecule magnet. Compound 2 possesses the highest operating temperature of the series with a 100 s blocking temperature of 62 K. Concomitant increases in the effective relaxation barrier and the maximum magnetic hysteresis temperature are observed, with 2 displaying a barrier of 1468 cm-1 and open magnetic hysteresis as high as 72 K at a sweep rate of 3.1 mT s-1. Magneto-structural correlations are discussed with the goal of guiding the synthesis of future high operating temperature DyIII metallocenium single-molecule magnets.
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Affiliation(s)
- K Randall McClain
- US Navy , Naval Air Warfare Center , Weapons Division , Research Department , Chemistry Division , China Lake , California 93555 , USA .
| | - Colin A Gould
- Department of Chemistry , University of California, Berkeley , Berkeley , California 94720 , USA .
| | - Khetpakorn Chakarawet
- Department of Chemistry , University of California, Berkeley , Berkeley , California 94720 , USA .
| | - Simon J Teat
- Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Thomas J Groshens
- US Navy , Naval Air Warfare Center , Weapons Division , Research Department , Chemistry Division , China Lake , California 93555 , USA .
| | - Jeffrey R Long
- Department of Chemistry , University of California, Berkeley , Berkeley , California 94720 , USA .
- Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
- Department of Chemical and Biomolecular Engineering , University of California, Berkeley , Berkeley , California 94720 , USA
| | - Benjamin G Harvey
- US Navy , Naval Air Warfare Center , Weapons Division , Research Department , Chemistry Division , China Lake , California 93555 , USA .
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41
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Izuogu DC, Yoshida T, Zhang H, Cosquer G, Katoh K, Ogata S, Hasegawa M, Nojiri H, Damjanović M, Wernsdorfer W, Uruga T, Ina T, Breedlove BK, Yamashita M. Slow Magnetic Relaxation in a Palladium-Gadolinium Complex Induced by Electron Density Donation from the Palladium Ion. Chemistry 2018; 24:9285-9294. [PMID: 29663534 DOI: 10.1002/chem.201800699] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 04/12/2018] [Indexed: 11/06/2022]
Abstract
Incorporating palladium in the first coordination sphere of acetato-bridged lanthanoid complexes, [Pd2 Ln2 (H2 O)2 (AcO)10 ]⋅2 AcOH (Ln=Gd (1), Y (2), Gd0.4 Y1.6 (3), Eu (4)), led to significant bonding interactions between the palladium and the lanthanoid ions, which were demonstrated by experimental and theoretical methods. We found that electron density was donated from the d8 Pd2+ ion to Gd3+ ion in 1 and 3, leading to the observed slow magnetic relaxation by using local orbital locator (LOL) and X-ray absorption near-edge structure (XANES) analysis. Field-induced dual slow magnetic relaxation was observed for 1 up to 20 K. Complex 3 and frozen aqueous and acetonitrile solutions of 1 showed only one relaxation peak, which confirms the role of intermolecular dipolar interactions in slowing the magnetic relaxation of 1. The slow magnetic relaxation occurred through a combination of Orbach and Direct processes with the highest pre-exponential factor (τo =0.06 s) reported so far for a gadolinium complex exhibiting slow magnetic relaxation. The results revealed that transition metal-lanthanoid (TM-Ln) axial interactions indeed could lead to new physical properties by affecting both the electronic and magnetic states of the compounds.
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Affiliation(s)
- David C Izuogu
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan.,Department of Pure & Industrial Chemistry, University of Nigeria, Nsukka, 410001, Nigeria.,Department of Chemistry, University of Cambridge, Lensfield Rd., Cambridge, CB2 1EW, UK
| | - Takefumi Yoshida
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan.,Electronic Functional Macromolecules Group, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan
| | - Haitao Zhang
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan
| | - Goulven Cosquer
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan
| | - Shuhei Ogata
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama-Gakuin University, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5258, Japan
| | - Miki Hasegawa
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama-Gakuin University, Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5258, Japan
| | - Hiroyuki Nojiri
- Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan
| | - Marko Damjanović
- Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology, Wolfgang-Gaede-Strasse 1, 76131, Karlsruhe, Germany
| | - Wolfgang Wernsdorfer
- Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology, Wolfgang-Gaede-Strasse 1, 76131, Karlsruhe, Germany.,CNRS and Université Grenoble Alpes, Institut Néel, 38042, Grenoble, France
| | - Tomoya Uruga
- Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Toshiaki Ina
- Research & Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Brian K Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Sendai, 980-8578, Japan.,WPI-Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai, 980-8577, Japan.,School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
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42
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Affiliation(s)
- Juan Sun
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zan Sun
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Licun Li
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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43
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Fernandez Garcia G, Lunghi A, Totti F, Sessoli R. The disclosure of mesoscale behaviour of a 3d-SMM monolayer on Au(111) through a multilevel approach. Nanoscale 2018; 10:4096-4104. [PMID: 29431791 DOI: 10.1039/c7nr06320b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Here we present a computational study of a full- and a half-monolayer of a Fe4 single molecule magnet ([Fe4(L)2(dpm)6], where H3L = 2-hydroxymethyl-2-phenylpropane-1,3-diol and Hdpm = dipivaloylmethane, Fe4Ph) on an unreconstructed surface of Au(111). This has been possible through the application of an integrated approach, which allows the explicit inclusion of the packing effects in the classical dynamics to be used in a second step in periodic and non-periodic high level DFT calculations. In this way we can obtain access to mesoscale geometrical data and verify how they can influence the magnetic properties of interest of the single Fe4 molecule. The proposed approach allows to overcome the ab initio state-of-the-art approaches used to study Single Molecule Magnets (SMMs), which are based on the study of one single adsorbed molecule and cannot represent effects on the scale of a monolayer. Indeed, we show here that it is possible to go beyond the computational limitations inherent to the use, for such complex systems, of accurate calculation techniques (e.g. ab initio molecular dynamics) without losing the level of accuracy necessary to gain new detailed insights, hardly reachable at the experimental level. Indeed, long-range and edge effects on the Fe4 structures and their easy axis of magnetization orientations have been evidenced as their different contributions to the overall macroscopic behavior.
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Affiliation(s)
- Guglielmo Fernandez Garcia
- Università degli Studi di Firenze. Dipartimento di Chimica "Ugo Schiff", Via della Lastruccia 3-13, 50019, Sesto Fiorentino, FI, Italy.
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Li H, Sun J, Yang M, Sun Z, Tang J, Ma Y, Li L. Functionalized Nitronyl Nitroxide Biradicals for the Construction of 3d–4f Heterometallic Compounds. Inorg Chem 2018; 57:9757-9765. [DOI: 10.1021/acs.inorgchem.7b03186] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hongdao Li
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Juan Sun
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Meng Yang
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zan Sun
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Jinkui Tang
- State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Yue Ma
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Licun Li
- Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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45
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Sun J, Yang M, Xi L, Ma Y, Li L. Magnetic relaxation in [Ln(hfac)4]− anions with [Cu(hfac)-radical]nn+ cation chains as counterions. Dalton Trans 2018; 47:8142-8148. [DOI: 10.1039/c8dt01651h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two novel 3d–4f compounds involving [Ln(hfac)4]− anions and {[Cu-radical]+}n cation chains are presented. The Dy derivative exhibits slow magnetization relaxation.
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Affiliation(s)
- Juan Sun
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Meng Yang
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Lu Xi
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Yue Ma
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Licun Li
- Department of Chemistry
- Key Laboratory of Advanced Energy Materials Chemistry and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
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46
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Xiao ZX, Miao H, Shao D, Wei HY, Zhang YQ, Wang XY. A family of lanthanide compounds with reduced nitronyl nitroxide diradical: syntheses, structures and magnetic properties. Dalton Trans 2018; 47:7925-7933. [DOI: 10.1039/c8dt01112e] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A new diradical based on the pyrazine ring and a series of Ln2 compounds with its reduced form have been synthesized and characterized structurally and magnetically.
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Affiliation(s)
- Zhao-Xin Xiao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Hao Miao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Dong Shao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
| | - Hai-Yan Wei
- Jiangsu Key Laboratory of Biofunctional Materials
- School of Chemistry and Materials Science
- Nanjing Normal University
- Nanjing
- China
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS
- School of Physical Science and Technology
- Nanjing Normal University
- Nanjing 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
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47
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Abstract
Multifunctional molecular materials exhibiting electrical conductivity and single-molecule magnet (SMM) behaviour are particularly attractive for electronic devices and related applications owing to the interaction between electronic conduction and magnetization of unimolecular units.
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Affiliation(s)
- Goulven Cosquer
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Yongbing Shen
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Manuel Almeida
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Masahiro Yamashita
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
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48
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Fukuda T, Ozawa H, Sakaguchi Y, Kizaki K, Kobayashi T, Fuyuhiro A, Ishikawa N. Selective Stabilization of the Spin States of a Magnetically Anisotropic Dysprosium Ion Induced by Photo-Excitation of the Associated Cyclic π-Conjugated System. Chemistry 2017; 23:16357-16363. [PMID: 28884845 DOI: 10.1002/chem.201703588] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Indexed: 11/10/2022]
Abstract
The presence of a new electronic interaction, which couples a 4 f-electronic system with a total angular momentum J and a photoexcited cyclic π-conjugated system with an orbital angular momentum L, in the bis(phthalocyaninato)dysprosium single-molecule magnet ([DyPc2 ]- ) is reported. Two π-π* excited states in the visible spectral region of the [DyPc2 ]- complex, which are denoted here as QL and QH , showed significantly different temperature and field dependences of the magnetic circular dichroism (MCD) A-term intensity. This phenomenon not only indicates the presence of a "J-L" interaction, but also that the interaction generates two different preferred orientations of the J-L pair, either parallel (for the QH band) or antiparallel (for the QL band), depending on the excitation energy. We have constructed a theoretical model that reproduces the temperature and field dependences, and quantitatively evaluated the J-L interaction.
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Affiliation(s)
- Takamitsu Fukuda
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyamacho, Toyonaka, Osaka, 560-0043, Japan
| | - Hideaki Ozawa
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyamacho, Toyonaka, Osaka, 560-0043, Japan
| | - Yutaro Sakaguchi
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyamacho, Toyonaka, Osaka, 560-0043, Japan
| | - Kazuro Kizaki
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyamacho, Toyonaka, Osaka, 560-0043, Japan
| | - Toshiya Kobayashi
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyamacho, Toyonaka, Osaka, 560-0043, Japan
| | - Akira Fuyuhiro
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyamacho, Toyonaka, Osaka, 560-0043, Japan
| | - Naoto Ishikawa
- Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyamacho, Toyonaka, Osaka, 560-0043, Japan
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49
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Krainov IV, Klier J, Dmitriev AP, Klyatskaya S, Ruben M, Wernsdorfer W, Gornyi IV. Giant Magnetoresistance in Carbon Nanotubes with Single-Molecule Magnets TbPc 2. ACS Nano 2017; 11:6868-6880. [PMID: 28613829 DOI: 10.1021/acsnano.7b02014] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present experimental results and a theoretical model for the gate-controlled spin-valve effect in carbon nanotubes with side-attached single-molecule magnets TbPc2 (Terbium(III) bis-phthalocyanine). These structures show a giant magnetoresistance up to 1000% in experiments on single-wall nanotubes that are tunnel-coupled to the leads. The proposed theoretical model combines the spin-dependent Fano effect with Coulomb blockade and predicts a spin-spin interaction between the TbPc2 molecules, mediated by conducting electrons via the charging effect. This gate-tuned interaction is responsible for the stable magnetic ordering of the inner spins of the molecules in the absence of magnetic field. In the case of antiferromagnetic arrangement, electrons with either spin experience the scattering by the molecules, which results in blocking the linear transport. In strong magnetic fields, the Zeeman energy exceeds the effective antiferromagnetic coupling and one species of electrons is not scattered by molecules, which leads to a much lower total resistance at the resonant values of gate voltage, and hence to a supramolecular spin-valve effect.
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Affiliation(s)
- Igor V Krainov
- Ioffe Institute of the Russian Academy of Sciences , 194021 St. Petersburg, Russia
- Lappeenranta University of Technology , P.O. Box 20, 53851 Lappeenranta, Finland
| | - Janina Klier
- Institut für Nanotechnologie, Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany
- Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology , 76128 Karlsruhe, Germany
| | - Alexander P Dmitriev
- Ioffe Institute of the Russian Academy of Sciences , 194021 St. Petersburg, Russia
| | - Svetlana Klyatskaya
- Institut für Nanotechnologie, Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany
| | - Mario Ruben
- Institut für Nanotechnologie, Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany
- Institut de Physique et Chimie des Materiaux (IPCMS), CNRS-Université de Strasbourg , 67034 Strasbourg, France
| | - Wolfgang Wernsdorfer
- Institut für Nanotechnologie, Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany
- Physikalisches Institut, Karlsruhe Institute of Technology , 76128 Karlsruhe, Germany
- Institut Néel, CNRS and Université Grenoble Alpes , 38000 Grenoble, France
| | - Igor V Gornyi
- Ioffe Institute of the Russian Academy of Sciences , 194021 St. Petersburg, Russia
- Institut für Nanotechnologie, Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany
- Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology , 76128 Karlsruhe, Germany
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50
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Yamabayashi T, Katoh K, Breedlove BK, Yamashita M. Molecular Orientation of a Terbium(III)-Phthalocyaninato Double-Decker Complex for Effective Suppression of Quantum Tunneling of the Magnetization. Molecules 2017; 22:molecules22060999. [PMID: 28617317 PMCID: PMC6152734 DOI: 10.3390/molecules22060999] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 06/09/2017] [Accepted: 06/12/2017] [Indexed: 11/22/2022] Open
Abstract
Single-molecule magnet (SMM) properties of crystals of a terbium(III)-phthalocyaninato double-decker complex with different molecular packings (1: TbPc2, 2: TbPc2·CH2Cl2) were studied to elucidate the relationship between the molecular packing and SMM properties. From single crystal X-ray analyses, the high symmetry of the coordination environment of 2 suggested that the SMM properties were improved. Furthermore, the shorter intermolecular Tb–Tb distance and relative collinear alignment of the magnetic dipole in 2 indicated that the magnetic dipole–dipole interactions were stronger than those in 1. This was confirmed by using direct current magnetic measurements. From alternating current magnetic measurements, the activation energy for spin reversal for 1 and 2 were similar. However, the relaxation time for 2 is three orders of magnitude slower than that for 1 in the low-T region due to effective suppression of the quantum tunneling of the magnetization. These results suggest that the SMM properties of TbPc2 highly depend on the molecular packing.
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Affiliation(s)
- Tsutomu Yamabayashi
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan.
| | - Keiichi Katoh
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan.
| | - Brian K Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan.
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3, Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan.
- WPI Research Center, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.
- School of Materials Science and Engineering, Nankai University, Tianjin 300350, China.
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