1
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Stewart R, Canaj AB, Liu S, Regincós Martí E, Celmina A, Nichol G, Cheng HP, Murrie M, Hill S. Engineering Clock Transitions in Molecular Lanthanide Complexes. J Am Chem Soc 2024; 146:11083-11094. [PMID: 38619978 PMCID: PMC11046435 DOI: 10.1021/jacs.3c09353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 03/11/2024] [Accepted: 03/27/2024] [Indexed: 04/17/2024]
Abstract
Molecular lanthanide (Ln) complexes are promising candidates for the development of next-generation quantum technologies. High-symmetry structures incorporating integer spin Ln ions can give rise to well-isolated crystal field quasi-doublet ground states, i.e., quantum two-level systems that may serve as the basis for magnetic qubits. Recent work has shown that symmetry lowering of the coordination environment around the Ln ion can produce an avoided crossing or clock transition within the ground doublet, leading to significantly enhanced coherence. Here, we employ single-crystal high-frequency electron paramagnetic resonance spectroscopy and high-level ab initio calculations to carry out a detailed investigation of the nine-coordinate complexes, [HoIIIL1L2], where L1 = 1,4,7,10-tetrakis(2-pyridylmethyl)-1,4,7,10-tetraaza-cyclododecane and L2 = F- (1) or [MeCN]0 (2). The pseudo-4-fold symmetry imposed by the neutral organic ligand scaffold (L1) and the apical anionic fluoride ion generates a strong axial anisotropy with an mJ = ±8 ground-state quasi-doublet in 1, where mJ denotes the projection of the J = 8 spin-orbital moment onto the ∼C4 axis. Meanwhile, off-diagonal crystal field interactions give rise to a giant 116.4 ± 1.0 GHz clock transition within this doublet. We then demonstrate targeted crystal field engineering of the clock transition by replacing F- with neutral MeCN (2), resulting in an increase in the clock transition frequency by a factor of 2.2. The experimental results are in broad agreement with quantum chemical calculations. This tunability is highly desirable because decoherence caused by second-order sensitivity to magnetic noise scales inversely with the clock transition frequency.
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Affiliation(s)
- Robert Stewart
- National
High Magnetic Field Laboratory, Florida
State University, Tallahassee, Florida 32310, United States
- Department
of Physics, Florida State University, Tallahassee, Florida 32306, United States
- Center
for Molecular Magnetic Quantum Materials, University of Florida, Gainesville, Florida 32611, United States
| | - Angelos B. Canaj
- School
of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K.
| | - Shuanglong Liu
- Center
for Molecular Magnetic Quantum Materials, University of Florida, Gainesville, Florida 32611, United States
- Department
of Physics, Northeastern University, Boston, Massachusetts 02115, United States
| | - Emma Regincós Martí
- School
of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K.
| | - Anna Celmina
- School
of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K.
| | - Gary Nichol
- EastCHEM
School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh EH9 3FJ, Scotland, U.K.
| | - Hai-Ping Cheng
- Center
for Molecular Magnetic Quantum Materials, University of Florida, Gainesville, Florida 32611, United States
- Department
of Physics, Northeastern University, Boston, Massachusetts 02115, United States
| | - Mark Murrie
- School
of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, U.K.
| | - Stephen Hill
- National
High Magnetic Field Laboratory, Florida
State University, Tallahassee, Florida 32310, United States
- Department
of Physics, Florida State University, Tallahassee, Florida 32306, United States
- Center
for Molecular Magnetic Quantum Materials, University of Florida, Gainesville, Florida 32611, United States
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2
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Chiesa A, Santini P, Garlatti E, Luis F, Carretta S. Molecular nanomagnets: a viable path toward quantum information processing? REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2024; 87:034501. [PMID: 38314645 DOI: 10.1088/1361-6633/ad1f81] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 01/17/2024] [Indexed: 02/06/2024]
Abstract
Molecular nanomagnets (MNMs), molecules containing interacting spins, have been a playground for quantum mechanics. They are characterized by many accessible low-energy levels that can be exploited to store and process quantum information. This naturally opens the possibility of using them as qudits, thus enlarging the tools of quantum logic with respect to qubit-based architectures. These additional degrees of freedom recently prompted the proposal for encoding qubits with embedded quantum error correction (QEC) in single molecules. QEC is the holy grail of quantum computing and this qudit approach could circumvent the large overhead of physical qubits typical of standard multi-qubit codes. Another important strength of the molecular approach is the extremely high degree of control achieved in preparing complex supramolecular structures where individual qudits are linked preserving their individual properties and coherence. This is particularly relevant for building quantum simulators, controllable systems able to mimic the dynamics of other quantum objects. The use of MNMs for quantum information processing is a rapidly evolving field which still requires to be fully experimentally explored. The key issues to be settled are related to scaling up the number of qudits/qubits and their individual addressing. Several promising possibilities are being intensively explored, ranging from the use of single-molecule transistors or superconducting devices to optical readout techniques. Moreover, new tools from chemistry could be also at hand, like the chiral-induced spin selectivity. In this paper, we will review the present status of this interdisciplinary research field, discuss the open challenges and envisioned solution paths which could finally unleash the very large potential of molecular spins for quantum technologies.
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Affiliation(s)
- A Chiesa
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
- INFN-Sezione di Milano-Bicocca, Gruppo Collegato di Parma, 43124 Parma, Italy
- UdR Parma, INSTM, I-43124 Parma, Italy
| | - P Santini
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
- INFN-Sezione di Milano-Bicocca, Gruppo Collegato di Parma, 43124 Parma, Italy
- UdR Parma, INSTM, I-43124 Parma, Italy
| | - E Garlatti
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
- INFN-Sezione di Milano-Bicocca, Gruppo Collegato di Parma, 43124 Parma, Italy
- UdR Parma, INSTM, I-43124 Parma, Italy
| | - F Luis
- Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC, Universidad de Zaragoza, Zaragoza, Spain
- Departamento de Fısica de la Materia Condensada, Universidad de Zaragoza, Zaragoza, Spain
| | - S Carretta
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, I-43124 Parma, Italy
- INFN-Sezione di Milano-Bicocca, Gruppo Collegato di Parma, 43124 Parma, Italy
- UdR Parma, INSTM, I-43124 Parma, Italy
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3
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Little EJ, Mrozek J, Rogers CJ, Liu J, McInnes EJL, Bowen AM, Ardavan A, Winpenny REP. Title: experimental realisation of multi-qubit gates using electron paramagnetic resonance. Nat Commun 2023; 14:7029. [PMID: 37919283 PMCID: PMC10622571 DOI: 10.1038/s41467-023-42169-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 09/28/2023] [Indexed: 11/04/2023] Open
Abstract
Quantum information processing promises to revolutionise computing; quantum algorithms have been discovered that address common tasks significantly more efficiently than their classical counterparts. For a physical system to be a viable quantum computer it must be possible to initialise its quantum state, to realise a set of universal quantum logic gates, including at least one multi-qubit gate, and to make measurements of qubit states. Molecular Electron Spin Qubits (MESQs) have been proposed to fulfil these criteria, as their bottom-up synthesis should facilitate tuning properties as desired and the reproducible production of multi-MESQ structures. Here we explore how to perform a two-qubit entangling gate on a multi-MESQ system, and how to readout the state via quantum state tomography. We propose methods of accomplishing both procedures using multifrequency pulse Electron Paramagnetic Resonance (EPR) and apply them to a model MESQ structure consisting of two nitroxide spin centres. Our results confirm the methodological principles and shed light on the experimental hurdles which must be overcome to realise a demonstration of controlled entanglement on this system.
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Affiliation(s)
- Edmund J Little
- Photon Science Institute and School of Chemistry, The University of Manchester, Oxford Road, M13 9PL, Manchester, UK
| | - Jacob Mrozek
- Clarendon Laboratory, University of Oxford, Parks Road, OX1 3PU, Oxford, UK
| | - Ciarán J Rogers
- Photon Science Institute and School of Chemistry, The University of Manchester, Oxford Road, M13 9PL, Manchester, UK
| | - Junjie Liu
- Clarendon Laboratory, University of Oxford, Parks Road, OX1 3PU, Oxford, UK
| | - Eric J L McInnes
- Photon Science Institute and School of Chemistry, The University of Manchester, Oxford Road, M13 9PL, Manchester, UK
| | - Alice M Bowen
- Photon Science Institute and School of Chemistry, The University of Manchester, Oxford Road, M13 9PL, Manchester, UK.
| | - Arzhang Ardavan
- Clarendon Laboratory, University of Oxford, Parks Road, OX1 3PU, Oxford, UK.
| | - Richard E P Winpenny
- Photon Science Institute and School of Chemistry, The University of Manchester, Oxford Road, M13 9PL, Manchester, UK.
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4
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Alotaibi R, Booth A, Little E, Brookfield A, Achari A, Lockyer SJ, Timco GA, Whitehead GFS, Vitórica-Yrezábal IJ, Chilton NF, Nair RR, Collison D, Winpenny REP. Synthesis and characterization of heterometallic rings templated through alkylammonium or imidazolium cations. Dalton Trans 2023; 52:7473-7481. [PMID: 37194350 PMCID: PMC10242454 DOI: 10.1039/d3dt00982c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 05/09/2023] [Indexed: 05/18/2023]
Abstract
We report the synthesis and structural characterization of a series of heterometallic rings templated via alkylammonium or imidazolium cations. The template and preference of each metal's coordination geometry can control the structure of heterometallic compounds, leading to octa-, nona-, deca-, dodeca-, and tetradeca-metallic rings. The compounds were characterized by single-crystal X-ray diffraction, elemental analysis, magnetometry, and EPR measurements. Magnetic measurements show that the exchange coupling between metal centres is antiferromagnetic. EPR spectroscopy shows that the spectra of {Cr7Zn} and {Cr9Zn} have S = 3/2 ground states, while the spectra of {Cr12Zn2} and {Cr8Zn} are consistent with S = 1 and 2 excited states. The EPR spectra of {(ImidH)-Cr6Zn2}, {(1-MeImH)-Cr8Zn2}, and {(1,2-diMeImH)-Cr8Zn2} include a combination of linkage isomers. The results on these related compounds allow us to examine the transferability of magnetic parameters between compounds.
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Affiliation(s)
- Rajeh Alotaibi
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Amy Booth
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Edmund Little
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Adam Brookfield
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Amritroop Achari
- Department of Chemical Engineering and Analytical Science and National Graphene Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Selena J Lockyer
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Grigore A Timco
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - George F S Whitehead
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Iñigo J Vitórica-Yrezábal
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Nicholas F Chilton
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Rahul R Nair
- Department of Chemical Engineering and Analytical Science and National Graphene Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - David Collison
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
| | - Richard E P Winpenny
- Department of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
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5
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Hu Z, Ullah A, Prima‐Garcia H, Chin S, Wang Y, Aragó J, Shi Z, Gaita‐Ariño A, Coronado E. Binding Sites, Vibrations and Spin-Lattice Relaxation Times in Europium(II)-Based Metallofullerene Spin Qubits. Chemistry 2021; 27:13242-13248. [PMID: 34268813 PMCID: PMC8518920 DOI: 10.1002/chem.202101922] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Indexed: 11/06/2022]
Abstract
To design molecular spin qubits with enhanced quantum coherence, a control of the coupling between the local vibrations and the spin states is crucial, which could be realized in principle by engineering molecular structures via coordination chemistry. To this end, understanding the underlying structural factors that govern the spin relaxation is a central topic. Here, we report the investigation of the spin dynamics in a series of chemically designed europium(II)-based endohedral metallofullerenes (EMFs). By introducing a unique structural difference, i. e. metal-cage binding site, while keeping other molecular parameters constant between different complexes, these manifest the key role of the three low-energy metal-displacing vibrations in mediating the spin-lattice relaxation times (T1 ). The temperature dependence of T1 can thus be normalized by the frequencies of these low energy vibrations to show an unprecedentedly universal behavior for EMFs in frozen CS2 solution. Our theoretical analysis indicates that this structural difference determines not only the vibrational rigidity but also spin-vibration coupling in these EMF-based qubit candidates.
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Affiliation(s)
- Ziqi Hu
- Instituto de Ciencia MolecularUniversidad de ValenciaC/Catedrático José Beltrán 246980PaternaSpain
- National Laboratory for Molecular SciencesState Key Laboratory of Rare Earth Materials Chemistryand ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871People's Republic of China
| | - Aman Ullah
- Instituto de Ciencia MolecularUniversidad de ValenciaC/Catedrático José Beltrán 246980PaternaSpain
| | - Helena Prima‐Garcia
- Instituto de Ciencia MolecularUniversidad de ValenciaC/Catedrático José Beltrán 246980PaternaSpain
| | - Sang‐Hyun Chin
- Instituto de Ciencia MolecularUniversidad de ValenciaC/Catedrático José Beltrán 246980PaternaSpain
| | - Yuanyuan Wang
- National Laboratory for Molecular SciencesState Key Laboratory of Rare Earth Materials Chemistryand ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871People's Republic of China
| | - Juan Aragó
- Instituto de Ciencia MolecularUniversidad de ValenciaC/Catedrático José Beltrán 246980PaternaSpain
| | - Zujin Shi
- National Laboratory for Molecular SciencesState Key Laboratory of Rare Earth Materials Chemistryand ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing100871People's Republic of China
| | - Alejandro Gaita‐Ariño
- Instituto de Ciencia MolecularUniversidad de ValenciaC/Catedrático José Beltrán 246980PaternaSpain
| | - Eugenio Coronado
- Instituto de Ciencia MolecularUniversidad de ValenciaC/Catedrático José Beltrán 246980PaternaSpain
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6
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Garlatti E, Tesi L, Lunghi A, Atzori M, Voneshen DJ, Santini P, Sanvito S, Guidi T, Sessoli R, Carretta S. Unveiling phonons in a molecular qubit with four-dimensional inelastic neutron scattering and density functional theory. Nat Commun 2020; 11:1751. [PMID: 32273510 PMCID: PMC7145838 DOI: 10.1038/s41467-020-15475-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 03/05/2020] [Indexed: 11/09/2022] Open
Abstract
Phonons are the main source of relaxation in molecular nanomagnets, and different mechanisms have been proposed in order to explain the wealth of experimental findings. However, very limited experimental investigations on phonons in these systems have been performed so far, yielding no information about their dispersions. Here we exploit state-of-the-art single-crystal inelastic neutron scattering to directly measure for the first time phonon dispersions in a prototypical molecular qubit. Both acoustic and optical branches are detected in crystals of [VO(acac)[Formula: see text]] along different directions in the reciprocal space. Using energies and polarisation vectors calculated with state-of-the-art Density Functional Theory, we reproduce important qualitative features of [VO(acac)[Formula: see text]] phonon modes, such as the presence of low-lying optical branches. Moreover, we evidence phonon anti-crossings involving acoustic and optical branches, yielding significant transfers of the spin-phonon coupling strength between the different modes.
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Affiliation(s)
- E Garlatti
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK.,Dipartimento di Science Matematiche, Fisiche e Informatiche, Università di Parma and UdR Parma, INSTM, Parco Area delle Scienze 7/A, 43124, Parma, Italy
| | - L Tesi
- Dipartimento di Chimica U. Schiff, Università degli Studi di Firenze and UdR Firenze, INSTM, Via della Lastruccia 3, I50019, Sesto Fiorentino, Firenze, Italy.,Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - A Lunghi
- School of Physics, CRANN and AMBER Trinity College, Dublin 2, Ireland
| | - M Atzori
- Dipartimento di Chimica U. Schiff, Università degli Studi di Firenze and UdR Firenze, INSTM, Via della Lastruccia 3, I50019, Sesto Fiorentino, Firenze, Italy.,Laboratoire National des Champs Magnétiques Intenses (LNCMI) - CNRS, 25 rue des Martyrs, 38042, Grenoble, France
| | - D J Voneshen
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - P Santini
- Dipartimento di Science Matematiche, Fisiche e Informatiche, Università di Parma and UdR Parma, INSTM, Parco Area delle Scienze 7/A, 43124, Parma, Italy
| | - S Sanvito
- School of Physics, CRANN and AMBER Trinity College, Dublin 2, Ireland
| | - T Guidi
- ISIS Facility, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK.
| | - R Sessoli
- Dipartimento di Chimica U. Schiff, Università degli Studi di Firenze and UdR Firenze, INSTM, Via della Lastruccia 3, I50019, Sesto Fiorentino, Firenze, Italy.
| | - S Carretta
- Dipartimento di Science Matematiche, Fisiche e Informatiche, Università di Parma and UdR Parma, INSTM, Parco Area delle Scienze 7/A, 43124, Parma, Italy.
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7
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Assembly of Five Coordination Polymers Based on Furan-2,5-dicarboxylic acid and 4,4′-Azobispyridine: Synthesis, Structures and Luminescence Properties. J Inorg Organomet Polym Mater 2020. [DOI: 10.1007/s10904-019-01199-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Fang YH, Liu Z, Wang YX, Zhou S, Jiang SD, Gao S. Orientation mapping of Rabi frequencies in a rare-earth molecular qu dit. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00784f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Utilizing the S = 7/2 4f spin and the D4 symmetry of a Gd(iii) complex, we propose and demonstrate an eight-leveled rare-earth molecular qudit, which can be coherently manipulated between adjacent energy levels with precompiled pulse durations.
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Affiliation(s)
- Yu-Hui Fang
- Beijing National Laboratory of Molecular Science
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Zheng Liu
- Beijing National Laboratory of Molecular Science
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Ye-Xin Wang
- Beijing National Laboratory of Molecular Science
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Shen Zhou
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
- China
- College of Aerospace Science and Engineering
| | - Shang-Da Jiang
- Beijing National Laboratory of Molecular Science
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Song Gao
- Beijing National Laboratory of Molecular Science
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
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9
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Yoshida T, Ninomiya Y, Higuchi M. Reversible four-color electrochromism triggered by the electrochemical multi-step redox of Cr-based metallo-supramolecular polymers. RSC Adv 2020; 10:10904-10909. [PMID: 35492949 PMCID: PMC9050427 DOI: 10.1039/d0ra00676a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 02/28/2020] [Indexed: 12/12/2022] Open
Abstract
Four color electrochromism (yellow, magenta, blue, and navy) has been achieved in Cr(iii)-based metallo-supramolecular polymers (polyCr), which were synthesized by 1 : 1 complexation of Cr ions and 1,4-di[[2,2′:6′,2′′-terpyridin]-4′-yl]benzene (L).
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Affiliation(s)
- Takefumi Yoshida
- Electronic Functional Macromolecules Group
- National Institute for Materials Science (NIMS)
- Tsukuba 305-0044
- Japan
| | - Yoshikazu Ninomiya
- Electronic Functional Macromolecules Group
- National Institute for Materials Science (NIMS)
- Tsukuba 305-0044
- Japan
| | - Masayoshi Higuchi
- Electronic Functional Macromolecules Group
- National Institute for Materials Science (NIMS)
- Tsukuba 305-0044
- Japan
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10
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Jackson CE, Lin CY, Johnson SH, van Tol J, Zadrozny JM. Nuclear-spin-pattern control of electron-spin dynamics in a series of V(iv) complexes. Chem Sci 2019; 10:8447-8454. [PMID: 31803424 PMCID: PMC6839508 DOI: 10.1039/c9sc02899d] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 07/27/2019] [Indexed: 12/28/2022] Open
Abstract
Achieving control of phase memory relaxation times (T m) in metal ions is an important goal of molecular spintronics. Herein we provide the first evidence that nuclear-spin patterning in the ligand shell is an important handle to modulate T m in metal ions. We synthesized and studied a series of five V(iv) complexes with brominated catecholate ligands, [V(C6H4-n Br n O2)3]2- (n = 0, 1, 2, and 4), where the 79/81Br and 1H nuclear spins are arranged in different substitutional patterns. High-field, high-frequency (120 GHz) pulsed electron paramagnetic resonance spectroscopic analysis of this series reveals a pattern-dependent variation in T m for the V(iv) ion. Notably, we show that it is possible for two molecules to have starkly different (by 50%) T m values despite the same chemical composition. Nuclear magnetic resonance analyses of the protons on the ligand shell suggest that relative chemical shift (δ), controlled by the patterning of nuclear spins, is an important underlying design principle. Here, having multiple ligand-based protons with nearly identical chemical shift values in the ligand shell will, ultimately, engender a short T m for the bound metal ion.
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Affiliation(s)
- Cassidy E Jackson
- Department of Chemistry , Colorado State University , Fort Collins , CO 80523 , USA .
| | - Chun-Yi Lin
- Department of Chemistry , Colorado State University , Fort Collins , CO 80523 , USA .
| | - Spencer H Johnson
- Department of Chemistry , Colorado State University , Fort Collins , CO 80523 , USA .
| | - Johan van Tol
- National High Magnetic Field Laboratory , Tallahassee , FL 32310 , USA
| | - Joseph M Zadrozny
- Department of Chemistry , Colorado State University , Fort Collins , CO 80523 , USA .
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11
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Lockyer SJ, Fielding AJ, Whitehead GFS, Timco GA, Winpenny REP, McInnes EJL. Close Encounters of the Weak Kind: Investigations of Electron-Electron Interactions between Dissimilar Spins in Hybrid Rotaxanes. J Am Chem Soc 2019; 141:14633-14642. [PMID: 31411874 PMCID: PMC6814243 DOI: 10.1021/jacs.9b05590] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
![]()
We report a family of hybrid [2]rotaxanes
based on inorganic [Cr7NiF8(O2CtBu)16]− (“{Cr7Ni}”)
rings templated about organic threads that are terminated at one end
with pyridyl groups. These rotaxanes can be coordinated to [Cu(hfac)2] (where Hhfac = 1,1,1,5,5,5-hexafluoroacetylacetone), to
give 1:1 or 1:2 Cu:{Cr7Ni} adducts: {[Cu(hfac)2](py-CH2NH2CH2CH2Ph)[Cr7NiF8(O2CtBu)16]}, {[Cu(hfac)2][py-CH2NH2CH2CH3][Cr7NiF8(O2CtBu)16]}, {[Cu(hfac)2]([py-CH2CH2NH2CH2C6H4SCH3][Cr7NiF8(O2CtBu)16])2}, {[Cu(hfac)2]([py-C6H4-CH2NH2(CH2)4Ph][Cr7NiF8(O2CtBu)16])2}, and {[Cu(hfac)2]([3-py-CH2CH2NH2(CH2)3SCH3][Cr7NiF8(O2CtBu)16])2}, the structures of which have been
determined by X-ray diffraction. The {Cr7Ni} rings and
CuII ions both have electronic spin S =
1/2, but with very different g-values. Continuous-wave
EPR spectroscopy reveals the exchange interactions between these dissimilar
spins, and hence the communication between the different molecular
components that comprise these supramolecular systems. The interactions
are weak such that we observe AX or AX2 type spectra. The
connectivity between the {Cr7Ni} ring and thread terminus
is varied such that the magnitude of the exchange interaction J can be tuned. The coupling is shown to be dominated by
through-bond rather than through-space mechanisms.
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Affiliation(s)
- Selena J Lockyer
- School of Chemistry and Photon Science Institute , The University of Manchester , Oxford Road , Manchester M13 9PL , U.K
| | - Alistair J Fielding
- School of Pharmacy and Biomolecular Sciences , Liverpool John Moores University , Liverpool L3 5UX , U.K
| | - George F S Whitehead
- School of Chemistry and Photon Science Institute , The University of Manchester , Oxford Road , Manchester M13 9PL , U.K
| | - Grigore A Timco
- School of Chemistry and Photon Science Institute , The University of Manchester , Oxford Road , Manchester M13 9PL , U.K
| | - Richard E P Winpenny
- School of Chemistry and Photon Science Institute , The University of Manchester , Oxford Road , Manchester M13 9PL , U.K
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute , The University of Manchester , Oxford Road , Manchester M13 9PL , U.K
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12
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Lenz S, Bamberger H, Hallmen PP, Thiebes Y, Otto S, Heinze K, van Slageren J. Chromium(iii)-based potential molecular quantum bits with long coherence times. Phys Chem Chem Phys 2019; 21:6976-6983. [PMID: 30869710 DOI: 10.1039/c9cp00745h] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular quantum bits based on copper(ii) or vanadium(iv) have been shown to possess long coherence times on multiple occasions. In contrast, studies in which non-spin-½ ions are employed are relatively scarce. High-spin ions provide additional states that can be used to encode further quantum bits. Furthermore, an optical rather than a microwave readout of molecular quantum bits is highly desirable, because in principle it could allow addressing at the single quantum bit level. The chromium(iii) complex [Cr(ddpd)2]3+ (ddpd = N,N'-dimethyl-N,N'-dipyridine-2-yl-pyridine-2,6-diamine) combines both the large spin (S = 3/2) and optical activity (strong, long lived luminescence). Here we demonstrate that the compound possesses coherence times of up to 8.4(1) μs, which are much longer (at least three times) than those for other chromium(iii)-based compounds. On the other hand, it is proved to be impossible to read out or influence the quantum state by optical means, underlining that further work is needed in this direction.
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Affiliation(s)
- Samuel Lenz
- Institute of Physical Chemistry and Center for Integrated Quantum Science and Technology, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
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13
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Xu MX, Liu Z, Dong BW, Cui HH, Wang YX, Su J, Wang Z, Song Y, Chen XT, Jiang SD, Gao S. Single-Crystal Study of a Low Spin Co(II) Molecular Qubit: Observation of Anisotropic Rabi Cycles. Inorg Chem 2019; 58:2330-2335. [PMID: 30648391 DOI: 10.1021/acs.inorgchem.8b02685] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mei-Xing Xu
- Beijing National Laboratory for Molecular Sciences, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zheng Liu
- Beijing National Laboratory for Molecular Sciences, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Bo-Wei Dong
- Beijing National Laboratory for Molecular Sciences, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Hui-Hui Cui
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Ye-Xin Wang
- Beijing National Laboratory for Molecular Sciences, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Jie Su
- Beijing National Laboratory for Molecular Sciences, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center & School of Physics, Huazhong University of Science and Technology, Wu-han 430074, P. R. China
| | - You Song
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Shang-Da Jiang
- Beijing National Laboratory for Molecular Sciences, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Beijing Academy of Quantum Information Sciences, West Bld. #3,No. 10 Xibeiwang East Rd., Haidian District, Beijing 100193, P. R. China
| | - Song Gao
- Beijing National Laboratory for Molecular Sciences, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Beijing Academy of Quantum Information Sciences, West Bld. #3,No. 10 Xibeiwang East Rd., Haidian District, Beijing 100193, P. R. China
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14
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Abstract
A viable qubit must have a long coherence time T 2 . In molecular nanomagnets, T 2 is often limited at low temperatures by the presence of dipole and hyperfine interactions, which are often mitigated through sample dilution, chemical engineering and isotope substitution in synthesis. Atomic-clock transitions offer another route to reducing decoherence from environmental fields by reducing the effective susceptibility of the working transition to field fluctuations. The Cr7Mn molecular nanomagnet, a heterometallic ring, features a clock transition at zero field. Both continuous-wave and spin-echo electron-spin resonance experiments on Cr7Mn samples, diluted via co-crystallization, show evidence of the effects of the clock transition with a maximum T 2 ∼ 390 ns at 1.8 K. We discuss improvements to the experiment that may increase T 2 further.
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15
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Robert J, Parizel N, Turek P, Boudalis AK. Relevance of Dzyaloshinskii–Moriya spectral broadenings in promoting spin decoherence: a comparative pulsed-EPR study of two structurally related iron(iii) and chromium(iii) spin-triangle molecular qubits. Phys Chem Chem Phys 2019; 21:19575-19584. [DOI: 10.1039/c9cp03422f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two related iron(iii) and chromium(iii) spin-triangle molecular qubits show coherent driving of their spins, and decoherence that is not significantly affected by Dzyaloshikskii–Moriya spectral broadenings.
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Affiliation(s)
- Jérôme Robert
- Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra)
- Université de Strasbourg
- F-67081 Strasbourg
- France
- Sorbonne Université
| | - Nathalie Parizel
- Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra)
- Université de Strasbourg
- F-67081 Strasbourg
- France
| | - Philippe Turek
- Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra)
- Université de Strasbourg
- F-67081 Strasbourg
- France
| | - Athanassios K. Boudalis
- Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra)
- Université de Strasbourg
- F-67081 Strasbourg
- France
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16
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Huang G, Fernandez-Garcia G, Badiane I, Camarra M, Freslon S, Guillou O, Daiguebonne C, Totti F, Cador O, Guizouarn T, Le Guennic B, Bernot K. Magnetic Slow Relaxation in a Metal-Organic Framework Made of Chains of Ferromagnetically Coupled Single-Molecule Magnets. Chemistry 2018; 24:6983-6991. [DOI: 10.1002/chem.201800095] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Gang Huang
- Univ. Rennes, INSA Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
| | - Guglielmo Fernandez-Garcia
- Univ. Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
- Laboratory of Molecular Magnetism (LaMM); Università degli studi di Firenze, INSTM unit; Via della lastruccia 3 50019 Sesto Fiorentino Italy
| | - Insa Badiane
- Univ. Rennes, INSA Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
- LCPM-Groupe “Matériaux Inorganiques: Chimie Douce et Cristallographie”; Université Assane Seck de Ziguinchor; BP 523 Ziguinchor Sénégal
| | - Magatte Camarra
- Univ. Rennes, INSA Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
- LCPM-Groupe “Matériaux Inorganiques: Chimie Douce et Cristallographie”; Université Assane Seck de Ziguinchor; BP 523 Ziguinchor Sénégal
| | - Stéphane Freslon
- Univ. Rennes, INSA Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
| | - Olivier Guillou
- Univ. Rennes, INSA Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
| | - Carole Daiguebonne
- Univ. Rennes, INSA Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
| | - Federico Totti
- Laboratory of Molecular Magnetism (LaMM); Università degli studi di Firenze, INSTM unit; Via della lastruccia 3 50019 Sesto Fiorentino Italy
| | - Olivier Cador
- Univ. Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
| | - Thierry Guizouarn
- 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
| | - Kevin Bernot
- Univ. Rennes, INSA Rennes, CNRS; ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226; 35000 Rennes France
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17
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Nam MS, Williams BH, Chen Y, Contera S, Yao S, Lu M, Chen YF, Timco GA, Muryn CA, Winpenny REP, Ardavan A. How to probe the spin contribution to momentum relaxation in topological insulators. Nat Commun 2018; 9:56. [PMID: 29302030 PMCID: PMC5754345 DOI: 10.1038/s41467-017-02420-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 11/28/2017] [Indexed: 11/29/2022] Open
Abstract
Topological insulators exhibit a metallic surface state in which the directions of the carriers' momentum and spin are locked together. This characteristic property, which lies at the heart of proposed applications of topological insulators, protects carriers in the surface state from back-scattering unless the scattering centres are time-reversal symmetry breaking (i.e. magnetic). Here, we introduce a method of probing the effect of magnetic scattering by decorating the surface of topological insulators with molecules, whose magnetic degrees of freedom can be engineered independently of their electrostatic structure. We show that this approach allows us to separate the effects of magnetic and non-magnetic scattering in the perturbative limit. We thereby confirm that the low-temperature conductivity of SmB6 is dominated by a surface state and that the momentum of quasiparticles in this state is particularly sensitive to magnetic scatterers, as expected in a topological insulator.
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Affiliation(s)
- Moon-Sun Nam
- The Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, UK.
| | - Benjamin H Williams
- The Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, UK
| | - Yulin Chen
- The Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, UK
| | - Sonia Contera
- The Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, UK
| | - Shuhua Yao
- National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, 210093, Nanjing, China
| | - Minghui Lu
- National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, 210093, Nanjing, China
| | - Yan-Feng Chen
- National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, 210093, Nanjing, China
| | - Grigore A Timco
- School of Chemistry and Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK
| | - Christopher A Muryn
- School of Chemistry and Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK
| | - Richard E P Winpenny
- School of Chemistry and Photon Science Institute, The University of Manchester, Manchester, M13 9PL, UK
| | - Arzhang Ardavan
- The Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, UK.
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18
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19
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Leng JD, Kostopoulos AK, Isherwood LH, Ariciu AM, Tuna F, Vitórica-Yrezábal IJ, Pritchard RG, Whitehead GFS, Timco GA, Mills DP, Winpenny REP. Chromium chains as polydentate fluoride ligands for actinides and group IV metals. Dalton Trans 2018; 47:6361-6369. [DOI: 10.1039/c8dt00803e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
New heterometallic rings containing Cr(iii) and tetravalent metals are reported, including a {Cr6Th2} cage.
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Affiliation(s)
- Ji-Dong Leng
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- School of Chemistry and Chemical Engineering
- Guangzhou University
- 230 Wai Huan Xi Road
- Guangzhou Higher Education Mega Center
| | | | - Liam H. Isherwood
- School of Chemistry and Photon Science Institute
- University of Manchester
- Manchester
- UK
| | - Ana-Maria Ariciu
- School of Chemistry and Photon Science Institute
- University of Manchester
- Manchester
- UK
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute
- University of Manchester
- Manchester
- UK
| | | | - Robin G. Pritchard
- School of Chemistry and Photon Science Institute
- University of Manchester
- Manchester
- UK
| | | | - Grigore A. Timco
- School of Chemistry and Photon Science Institute
- University of Manchester
- Manchester
- UK
| | - David P. Mills
- School of Chemistry and Photon Science Institute
- University of Manchester
- Manchester
- UK
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20
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Timco GA, Fernandez A, Kostopoulos AK, Muryn CA, Pritchard RG, Strashnov I, Vitorica-Yrezebal IJ, Whitehead GFS, Winpenny REP. An Extensive Family of Heterometallic Titanium(IV)-Metal(III) Rings with Structure Control through Templates. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706679] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Grigore A. Timco
- The School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Antonio Fernandez
- The School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Andreas K. Kostopoulos
- The School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Christopher A. Muryn
- The School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Robin G. Pritchard
- The School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Ilya Strashnov
- The School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | | | - George F. S. Whitehead
- The School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Richard E. P. Winpenny
- The School of Chemistry; The University of Manchester; Oxford Road Manchester M13 9PL UK
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21
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Timco GA, Fernandez A, Kostopoulos AK, Muryn CA, Pritchard RG, Strashnov I, Vitorica-Yrezebal IJ, Whitehead GFS, Winpenny REP. An Extensive Family of Heterometallic Titanium(IV)-Metal(III) Rings with Structure Control through Templates. Angew Chem Int Ed Engl 2017; 56:13629-13632. [PMID: 28884939 DOI: 10.1002/anie.201706679] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 09/04/2017] [Indexed: 12/24/2022]
Abstract
A family of heterometallic [Cat][Tix MO(x+1 )(O2 Ct Bu)2x+2 ] rings is reported where Cat=a secondary or tertiary alkyl ammonium ion, x=7, 8 or 9, and M=FeIII , GaIII , CrIII , InIII and AlIII . The structures are regular polygons with eight, nine or ten vertices with each edge bridged by an oxide and two pivalates. The size of the ring formed is controlled by the alkylammonium cation present. In each case a homometallic by-product is found [Cat][Tix O(x+1 )(O2 Ct Bu)2x-1 ].
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Affiliation(s)
- Grigore A Timco
- The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Antonio Fernandez
- The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Andreas K Kostopoulos
- The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Christopher A Muryn
- The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Robin G Pritchard
- The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Ilya Strashnov
- The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | | | - George F S Whitehead
- The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Richard E P Winpenny
- The School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
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22
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Molecular magnetism, quo vadis? A historical perspective from a coordination chemist viewpoint☆. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.004] [Citation(s) in RCA: 240] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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23
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Zaripov R, Vavilova E, Khairuzhdinov I, Salikhov K, Voronkova V, Abdulmalic MA, Meva FE, Weheabby S, Rüffer T, Büchner B, Kataev V. Tuning the spin coherence time of Cu(II)-(bis)oxamato and Cu(II)-(bis)oxamidato complexes by advanced ESR pulse protocols. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:943-955. [PMID: 28546889 PMCID: PMC5433190 DOI: 10.3762/bjnano.8.96] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 03/29/2017] [Indexed: 06/07/2023]
Abstract
We have investigated with the pulsed ESR technique at X- and Q-band frequencies the coherence and relaxation of Cu spins S = 1/2 in single crystals of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opba)] (1%) in the host lattice of [n-Bu4N]2[Ni(opba)] (99%, opba = o-phenylenebis(oxamato)) and of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opbon-Pr2)] (1%) in the host lattice of [n-Bu4N]2[Ni(opbon-Pr2)] (99%, opbon-Pr2 = o-phenylenebis(N(propyl)oxamidato)). For that we have measured the electron spin dephasing time Tm at different temperatures with the two-pulse primary echo and with the special Carr-Purcell-Meiboom-Gill (CPMG) multiple microwave pulse sequence. Application of the CPMG protocol has led to a substantial increase of the spin coherence lifetime in both complexes as compared to the primary echo results. It shows the efficiency of the suppression of the electron spin decoherence channel in the studied complexes arising due to spectral diffusion induced by a random modulation of the hyperfine interaction with the nuclear spins. We argue that this method can be used as a test for the relevance of the spectral diffusion for the electron spin decoherence. Our results have revealed a prominent role of the opba4- and opbon-Pr24- ligands for the dephasing of the Cu spins. The presence of additional 14N nuclei and protons in [Cu(opbon-Pr2)]2- as compared to [Cu(opba)]2- yields significantly shorter Tm times. Such a detrimental effect of the opbon-Pr24- ligands has to be considered when discussing a potential application of the Cu(II)-(bis)oxamato and Cu(II)-(bis)oxamidato complexes as building blocks of more complex molecular structures in prototype spintronic devices. Furthermore, in our work we propose an improved CPMG pulse protocol that enables elimination of unwanted echoes that inevitably appear in the case of inhomogeneously broadened ESR spectra due to the selective excitation of electron spins.
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Affiliation(s)
- Ruslan Zaripov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Evgeniya Vavilova
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Iskander Khairuzhdinov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Kev Salikhov
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Violeta Voronkova
- Kazan E. K. Zavoisky Physical -Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| | - Mohammad A Abdulmalic
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Francois E Meva
- Department of Pharmaceutical Sciences, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, BP 2701, Cameroon
| | - Saddam Weheabby
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Tobias Rüffer
- Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Institut für Chemie, Straße der Nationen 62, D-09111 Chemnitz, Germany
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
- Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Vladislav Kataev
- Leibniz Institute for Solid State and Materials Research IFW Dresden, D-01171 Dresden, Germany
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24
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Yu CJ, Graham MJ, Zadrozny JM, Niklas J, Krzyaniak MD, Wasielewski MR, Poluektov OG, Freedman DE. Long Coherence Times in Nuclear Spin-Free Vanadyl Qubits. J Am Chem Soc 2016; 138:14678-14685. [PMID: 27797487 DOI: 10.1021/jacs.6b08467] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Quantum information processing (QIP) offers the potential to create new frontiers in fields ranging from quantum biology to cryptography. Two key figures of merit for electronic spin qubits, the smallest units of QIP, are the coherence time (T2), the lifetime of the qubit, and the spin-lattice relaxation time (T1), the thermally defined upper limit of T2. To achieve QIP, processable qubits with long coherence times are required. Recent studies on (Ph4P-d20)2[V(C8S8)3], a vanadium-based qubit, demonstrate that millisecond T2 times are achievable in transition metal complexes with nuclear spin-free environments. Applying these principles to vanadyl complexes offers a route to combine the previously established surface compatibility of the flatter vanadyl structures with a long T2. Toward those ends, we investigated a series of four qubits, (Ph4P)2[VO(C8S8)2] (1), (Ph4P)2[VO(β-C3S5)2] (2), (Ph4P)2[VO(α-C3S5)2] (3), and (Ph4P)2[VO(C3S4O)2] (4), by pulsed electron paramagnetic resonance (EPR) spectroscopy and compared the performance of these species with our recently reported set of vanadium tris(dithiolene) complexes. Crucially we demonstrate that solutions of 1-4 in SO2, a uniquely polar nuclear spin-free solvent, reveal T2 values of up to 152(6) μs, comparable to the best molecular qubit candidates. Upon transitioning to vanadyl species from the tris(dithiolene) analogues, we observe a remarkable order of magnitude increase in T1, attributed to stronger solute-solvent interactions with the polar vanadium-oxo moiety. Simultaneously, we detect a small decrease in T2 for the vanadyl analogues relative to the tris(dithiolene) complexes. We attribute this decrease to the absence of one nuclear spin-free ligand, which served to shield the vanadium centers against solvent nuclear spins. Our results highlight new design principles for long T1 and T2 times by demonstrating the efficacy of ligand-based tuning of solute-solvent interactions.
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Affiliation(s)
- Chung-Jui Yu
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Michael J Graham
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Joseph M Zadrozny
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Jens Niklas
- Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Matthew D Krzyaniak
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.,Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , Evanston, Illinois 60208-3113, United States
| | - Michael R Wasielewski
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.,Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , Evanston, Illinois 60208-3113, United States
| | - Oleg G Poluektov
- Chemical Sciences and Engineering Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Danna E Freedman
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
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25
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26
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Náfrádi B, Choucair M, Dinse KP, Forró L. Room temperature manipulation of long lifetime spins in metallic-like carbon nanospheres. Nat Commun 2016; 7:12232. [PMID: 27426851 PMCID: PMC4960311 DOI: 10.1038/ncomms12232] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Accepted: 06/14/2016] [Indexed: 01/28/2023] Open
Abstract
The time-window for processing electron spin information (spintronics) in solid-state quantum electronic devices is determined by the spin–lattice and spin–spin relaxation times of electrons. Minimizing the effects of spin–orbit coupling and the local magnetic contributions of neighbouring atoms on spin–lattice and spin–spin relaxation times at room temperature remain substantial challenges to practical spintronics. Here we report conduction electron spin–lattice and spin–spin relaxation times of 175 ns at 300 K in 37±7 nm carbon spheres, which is remarkably long for any conducting solid-state material of comparable size. Following the observation of spin polarization by electron spin resonance, we control the quantum state of the electron spin by applying short bursts of an oscillating magnetic field and observe coherent oscillations of the spin state. These results demonstrate the feasibility of operating electron spins in conducting carbon nanospheres as quantum bits at room temperature. Electronic decoherence due to spin-orbit and magnetic interactions limits the application of spintronic nanosystems in quantum information processing. Here, the authors report notably long spin-lattice and spin-spin relaxation times of 175 ns at room temperature in carbon nanospheres.
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Affiliation(s)
- Bálint Náfrádi
- Laboratory of Physics of Complex Matter (LPMC), Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Mohammad Choucair
- School of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Klaus-Peter Dinse
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - László Forró
- Laboratory of Physics of Complex Matter (LPMC), Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
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27
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Fataftah MS, Zadrozny JM, Coste SC, Graham MJ, Rogers DM, Freedman DE. Employing Forbidden Transitions as Qubits in a Nuclear Spin-Free Chromium Complex. J Am Chem Soc 2016; 138:1344-8. [DOI: 10.1021/jacs.5b11802] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Majed S. Fataftah
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Joseph M. Zadrozny
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Scott C. Coste
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Michael J. Graham
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Dylan M. Rogers
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Danna E. Freedman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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28
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Fernandez A, Ferrando-Soria J, Pineda EM, Tuna F, Vitorica-Yrezabal IJ, Knappke C, Ujma J, Muryn CA, Timco GA, Barran PE, Ardavan A, Winpenny RE. Making hybrid [n]-rotaxanes as supramolecular arrays of molecular electron spin qubits. Nat Commun 2016; 7:10240. [PMID: 26742716 PMCID: PMC4729860 DOI: 10.1038/ncomms10240] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Accepted: 11/17/2015] [Indexed: 02/04/2023] Open
Abstract
Quantum information processing (QIP) would require that the individual units involved--qubits--communicate to other qubits while retaining their identity. In many ways this resembles the way supramolecular chemistry brings together individual molecules into interlocked structures, where the assembly has one identity but where the individual components are still recognizable. Here a fully modular supramolecular strategy has been to link hybrid organic-inorganic [2]- and [3]-rotaxanes into still larger [4]-, [5]- and [7]-rotaxanes. The ring components are heterometallic octanuclear [Cr7NiF8(O2C(t)Bu)16](-) coordination cages and the thread components template the formation of the ring about the organic axle, and are further functionalized to act as a ligand, which leads to large supramolecular arrays of these heterometallic rings. As the rings have been proposed as qubits for QIP, the strategy provides a possible route towards scalable molecular electron spin devices for QIP. Double electron-electron resonance experiments demonstrate inter-qubit interactions suitable for mediating two-qubit quantum logic gates.
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Affiliation(s)
- Antonio Fernandez
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Jesus Ferrando-Soria
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Eufemio Moreno Pineda
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Iñigo J. Vitorica-Yrezabal
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | | | - Jakub Ujma
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
- The Michael Barber Centre for Collaborative Mass Spectrometry, Manchester Institute of Biotechnology, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Christopher A. Muryn
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Grigore A. Timco
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Perdita E. Barran
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
- The Michael Barber Centre for Collaborative Mass Spectrometry, Manchester Institute of Biotechnology, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Arzhang Ardavan
- Department of Physics, Centre for Advanced Electron Spin Resonance, The Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
| | - Richard E.P. Winpenny
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
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29
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Ghirri A, Chiesa A, Carretta S, Troiani F, van Tol J, Hill S, Vitorica-Yrezabal I, Timco GA, Winpenny REP, Affronte M. Coherent Spin Dynamics in Molecular Cr8Zn Wheels. J Phys Chem Lett 2015; 6:5062-6. [PMID: 26633293 DOI: 10.1021/acs.jpclett.5b02527] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Controlling and understanding transitions between molecular spin states allows selection of the most suitable ones for qubit encoding. Here we present a detailed investigation of single crystals of a polynuclear Cr8Zn molecular wheel using 241 GHz electron paramagnetic resonance (EPR) spectroscopy in high magnetic field. Continuous wave spectra are well reproduced by spin Hamiltonian calculations, which evidence that transitions in correspondence to a well-defined anticrossing involve mixed states with different total spin. We studied, by means of spin echo experiments, the temperature dependence of the dephasing time (T2) down to 1.35 K. These results are reproduced by considering both hyperfine and intermolecular dipolar interactions, evidencing that the dipolar contribution is completely suppressed at the lowest temperature. Overall, these results shed light on the effects of the decoherence mechanisms, whose understanding is crucial to exploit chemically engineered molecular states as a resource for quantum information processing.
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Affiliation(s)
- Alberto Ghirri
- Istituto Nanoscienze-CNR , via G. Campi 213A, 41125 Modena, Italy
| | - Alessandro Chiesa
- Dipartimento di Fisica e Scienze della Terra, Università di Parma , Parco Area delle Scienze 7/a, 43123 Parma, Italy
| | - Stefano Carretta
- Dipartimento di Fisica e Scienze della Terra, Università di Parma , Parco Area delle Scienze 7/a, 43123 Parma, Italy
| | - Filippo Troiani
- Istituto Nanoscienze-CNR , via G. Campi 213A, 41125 Modena, Italy
| | - Johan van Tol
- National High Magnetic Field Laboratory , Tallahassee, Florida 32310, United States
| | - Stephen Hill
- National High Magnetic Field Laboratory , Tallahassee, Florida 32310, United States
- Department of Physics, Florida State University , Tallahassee, Florida 32306, United States
| | - Inigo Vitorica-Yrezabal
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Grigore A Timco
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Richard E P Winpenny
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Marco Affronte
- Istituto Nanoscienze-CNR , via G. Campi 213A, 41125 Modena, Italy
- Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia , via Campi 213A, 41125 Modena, Italy
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30
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McInnes EJL, Timco GA, Whitehead GFS, Winpenny REP. Heterometallic Rings: Their Physics and use as Supramolecular Building Blocks. Angew Chem Int Ed Engl 2015; 54:14244-69. [PMID: 26459810 DOI: 10.1002/anie.201502730] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Indexed: 11/10/2022]
Abstract
An enormous family of heterometallic rings has been made. The first were Cr7 M rings where M = Ni(II), Zn(II), Mn(II), and rings have been made with as many as fourteen metal centers in the cyclic structure. They are bridged externally by carboxylates, and internally by fluorides or a penta-deprotonated polyol. The size of the rings is controlled through templates which have included a range of ammonium or imidazolium ions, alkali metals and coordination compounds. The rings can be functionalized to act as ligands, and incorporated into hybrid organic-inorganic rotaxanes and into molecules containing up to 200 metal centers. Physical studies reported include: magnetic measurements, inelastic neutron scattering (including single crystal measurements), electron paramagnetic resonance spectroscopy (including measurements of phase memory times), NMR spectroscopy (both solution and solid state), and polarized neutron diffraction. The rings are hence ideal for understanding magnetism in elegant exchange-coupled systems.
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Affiliation(s)
- Eric J L McInnes
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL (UK)
| | - Grigore A Timco
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL (UK)
| | - George F S Whitehead
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL (UK)
| | - Richard E P Winpenny
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL (UK).
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31
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McInnes EJL, Timco GA, Whitehead GFS, Winpenny REP. Heterometallische Ringe: physikalische Eigenschaften und Verwendung als supramolekulare Bausteine. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502730] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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32
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Kim J, Silakov A, Yennawar HP, Lear BJ. Structural, Electronic, and Magnetic Characterization of a Dinuclear Zinc Complex Containing TCNQ(-) and a μ-[TCNQ-TCNQ](2-) Ligand. Inorg Chem 2015; 54:6072-4. [PMID: 26085029 DOI: 10.1021/acs.inorgchem.5b00808] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A dinuclear zinc complex containing both a σ-dimerized 7,7,8,8-tetracyanoquinodimethane (TCNQ) ligand ([TCNQ-TCNQ](2-)) and TCNQ(-) was synthesized for the first time. This is the first instance of a single molecular complex with a bridging [TCNQ-TCNQ](2-) ligand. Each zinc center is coordinated with two 2,2'-bipyrimidines and one TCNQ(-), and the remaining coordination site is occupied by a [TCNQ-TCNQ](2-) ligand, which bridges the two zinc centers. The complex facilitates π-stacking of TCNQ(-) ligands when crystallized, which gives rise to a near-IR charge-transfer transition and strong antiferromagnetic coupling.
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Affiliation(s)
- Juyeong Kim
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Alexey Silakov
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Hemant P Yennawar
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Benjamin J Lear
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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33
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Chiesa A, Whitehead GFS, Carretta S, Carthy L, Timco GA, Teat SJ, Amoretti G, Pavarini E, Winpenny REP, Santini P. Molecular nanomagnets with switchable coupling for quantum simulation. Sci Rep 2014; 4:7423. [PMID: 25502419 PMCID: PMC4262827 DOI: 10.1038/srep07423] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 11/17/2014] [Indexed: 11/09/2022] Open
Abstract
Molecular nanomagnets are attractive candidate qubits because of their wide inter- and intra-molecular tunability. Uniform magnetic pulses could be exploited to implement one- and two-qubit gates in presence of a properly engineered pattern of interactions, but the synthesis of suitable and potentially scalable supramolecular complexes has proven a very hard task. Indeed, no quantum algorithms have ever been implemented, not even a proof-of-principle two-qubit gate. Here we show that the magnetic couplings in two supramolecular {Cr7Ni}-Ni-{Cr7Ni} assemblies can be chemically engineered to fit the above requisites for conditional gates with no need of local control. Microscopic parameters are determined by a recently developed many-body ab-initio approach and used to simulate quantum gates. We find that these systems are optimal for proof-of-principle two-qubit experiments and can be exploited as building blocks of scalable architectures for quantum simulation.
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Affiliation(s)
- Alessandro Chiesa
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, Parco Area delle Scienze 7/a, 43124 Parma, Italy
- Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - George F. S. Whitehead
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Stefano Carretta
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, Parco Area delle Scienze 7/a, 43124 Parma, Italy
| | - Laura Carthy
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Grigore A. Timco
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Simon J. Teat
- Advanced Light Source, Lawrence Berkeley Laboratory, MS2-400 Berkeley, California 94720, USA
| | - Giuseppe Amoretti
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, Parco Area delle Scienze 7/a, 43124 Parma, Italy
| | - Eva Pavarini
- Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany
- JARA High-Performance Computing
| | - Richard E. P. Winpenny
- School of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Paolo Santini
- Dipartimento di Fisica e Scienze della Terra, Università di Parma, Parco Area delle Scienze 7/a, 43124 Parma, Italy
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34
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Jung J, Cador O, Bernot K, Pointillart F, Luzon J, Le Guennic B. Influence of the supramolecular architecture on the magnetic properties of a Dy(III) single-molecule magnet: an ab initio investigation. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:2267-2274. [PMID: 25551055 PMCID: PMC4273297 DOI: 10.3762/bjnano.5.236] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Accepted: 10/05/2014] [Indexed: 06/04/2023]
Abstract
Single-crystal angular-resolved magnetometry and wavefunction-based calculations have been used to reconsider the magnetic properties of a recently reported Dy(III)-based single-molecule magnet, namely [Dy(hfac)3(L(1))] with hfac(-) = 1,1,1,5,5,5-hexafluoroacetylacetonate and L(1) = 2-(4,5-bis(propylthio)-1,3-dithiol-2-ylidene)-6-(pyridin-2-yl)-5H-[1,3]dithiolo[4',5':4,5]benzo[1,2-d]imidazole. The magnetic susceptibility and magnetization at low temperature are found to be strongly influenced by supramolecular interactions. Moreover, taking into account the hydrogen-bond networks in the calculations allows to explain the orientation of the magnetic axes. This strongly suggests that hydrogen bonds play an important role in the modulation of the electrostatic environment around the Dy(III) center that governs the nature of its magnetic ground-state and the orientation of its anisotropy axes. We thus show here that SMM properties that rely on supramolecular organization may not be transferable into single-molecule devices.
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Affiliation(s)
- Julie Jung
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Olivier Cador
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Kevin Bernot
- INSA, ISCR, UMR 6226, Université Européenne de Bretagne, 35708 Rennes, France
| | - Fabrice Pointillart
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Javier Luzon
- Instituto de Ciencia de Materiales de Aragon, CSIC–Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
- Centro Universitario de la Defensa, Academia General Militar, Zaragoza, Spain
| | - Boris Le Guennic
- Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
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35
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Room temperature quantum coherence in a potential molecular qubit. Nat Commun 2014; 5:5304. [DOI: 10.1038/ncomms6304] [Citation(s) in RCA: 208] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 09/18/2014] [Indexed: 12/24/2022] Open
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36
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Garlatti E, Albring MA, Baker ML, Docherty RJ, Mutka H, Guidi T, Garcia Sakai V, Whitehead GFS, Pritchard RG, Timco GA, Tuna F, Amoretti G, Carretta S, Santini P, Lorusso G, Affronte M, McInnes EJL, Collison D, Winpenny REP. A Detailed Study of the Magnetism of Chiral {Cr7M} Rings: An Investigation into Parametrization and Transferability of Parameters. J Am Chem Soc 2014; 136:9763-72. [DOI: 10.1021/ja5047445] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elena Garlatti
- Dipartimento
di Fisica e Scienze della Terra, Università di Parma, via G.P. Usberti
7/a, 43123 Parma, Italy
| | - Morten A. Albring
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Michael L. Baker
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
- Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - Rebecca J. Docherty
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Hannu Mutka
- Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042 Grenoble Cedex 9, France
| | - Tatiana Guidi
- ISIS
Facility, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | | | - George F. S. Whitehead
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Robin G. Pritchard
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Grigore A. Timco
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Floriana Tuna
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Giuseppe Amoretti
- Dipartimento
di Fisica e Scienze della Terra, Università di Parma, via G.P. Usberti
7/a, 43123 Parma, Italy
| | - Stefano Carretta
- Dipartimento
di Fisica e Scienze della Terra, Università di Parma, via G.P. Usberti
7/a, 43123 Parma, Italy
| | - Paolo Santini
- Dipartimento
di Fisica e Scienze della Terra, Università di Parma, via G.P. Usberti
7/a, 43123 Parma, Italy
| | - Giulia Lorusso
- Dipartimento
di Fisica, Università di Modena e Reggio Emilia, via Campi
213/a, 41100 Modena, Italy
| | - Marco Affronte
- Dipartimento
di Fisica, Università di Modena e Reggio Emilia, via Campi
213/a, 41100 Modena, Italy
| | - Eric J. L. McInnes
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - David Collison
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Richard E. P. Winpenny
- School
of Chemistry and Photon Science Institute, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
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37
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Graham MJ, Zadrozny JM, Shiddiq M, Anderson JS, Fataftah MS, Hill S, Freedman DE. Influence of Electronic Spin and Spin–Orbit Coupling on Decoherence in Mononuclear Transition Metal Complexes. J Am Chem Soc 2014; 136:7623-6. [DOI: 10.1021/ja5037397] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael J. Graham
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Joseph M. Zadrozny
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Muhandis Shiddiq
- National
High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - John S. Anderson
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Majed S. Fataftah
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Stephen Hill
- National
High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Danna E. Freedman
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
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