1
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Zhang Y, Torres-Cavanillas R, Yan X, Zeng Y, Jiang M, Clemente-León M, Coronado E, Shi S. Spin crossover iron complexes with spin transition near room temperature based on nitrogen ligands containing aromatic rings: from molecular design to functional devices. Chem Soc Rev 2024. [PMID: 39072682 DOI: 10.1039/d3cs00688c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
During last decades, significant advances have been made in iron-based spin crossover (SCO) complexes, with a particular emphasis on achieving reversible and reproducible thermal hysteresis at room temperature (RT). This pursuit represents a pivotal goal within the field of molecular magnetism, aiming to create molecular devices capable of operating in ambient conditions. Here, we summarize the recent progress of iron complexes with spin transition near RT based on nitrogen ligands containing aromatic rings from molecular design to functional devices. Specifically, we discuss the various factors, including supramolecular interactions, crystal packing, guest molecules and pressure effects, that could influence its cooperativity and the spin transition temperature. Furthermore, the most recent advances in their implementation as mechanical actuators, switching/memories, sensors, and other devices, have been introduced as well. Finally, we give a perspective on current challenges and future directions in SCO community.
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Affiliation(s)
- Yongjie Zhang
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Ramón Torres-Cavanillas
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Xinxin Yan
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Yixun Zeng
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Mengyun Jiang
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
| | - Miguel Clemente-León
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, Catedrático José Beltrán 2, 46980 Paterna, Spain.
| | - Shengwei Shi
- Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China.
- Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education), Jianghan University, Wuhan, 430056, China
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2
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Marino M, Molteni E, Achilli S, Onida G, Fratesi G. Ab Initio Electronic, Magnetic, and Optical Properties of Fe Phthalocyanine on Cr 2O 3(0001). Molecules 2024; 29:2889. [PMID: 38930954 PMCID: PMC11206909 DOI: 10.3390/molecules29122889] [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: 05/20/2024] [Revised: 06/14/2024] [Accepted: 06/16/2024] [Indexed: 06/28/2024] Open
Abstract
The organic molecules adsorbed on antiferromagnetic surfaces can produce interesting interface states, characterized by charge transfer mechanisms, hybridization of molecular-substrate orbitals, as well as magnetic couplings. Here, we apply an ab initio approach to study the adsorption of Fe phthalocyanine on stoichiometric Cr2O3(0001). The molecule binds via a bidentate configuration forming bonds between two opposite imide N atoms and two protruding Cr ones, making this preferred over the various possible adsorption structures. In addition to the local modifications at these sites, the electronic structure of the molecule is weakly influenced. The magnetic structure of the surface Cr atoms shows a moderate influence of molecule adsorption, not limited to the atoms in the close proximity of the molecule. Upon optical excitation at the onset, electron density moves toward the molecule, enhancing the ground state charge transfer. We investigate this movement of charge as a mechanism at the base of light-induced modifications of the magnetic structure at the interface.
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Affiliation(s)
- Marco Marino
- ETSF and Physics Department “Aldo Pontremoli”, University of Milan, Via Celoria 16, 20133 Milan, Italy; (E.M.); (S.A.); (G.O.)
| | | | | | | | - Guido Fratesi
- ETSF and Physics Department “Aldo Pontremoli”, University of Milan, Via Celoria 16, 20133 Milan, Italy; (E.M.); (S.A.); (G.O.)
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3
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Gnoli L, Benini M, Del Conte C, Riminucci A, Rakshit RK, Singh M, Sanna S, Yadav R, Lin KW, Mezzi A, Achilli S, Molteni E, Marino M, Fratesi G, Dediu V, Bergenti I. Enhancement of Magnetic Stability in Antiferromagnetic CoO Films by Adsorption of Organic Molecules. ACS APPLIED ELECTRONIC MATERIALS 2024; 6:3138-3146. [PMID: 38828040 PMCID: PMC11137817 DOI: 10.1021/acsaelm.3c01599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 02/14/2024] [Accepted: 02/19/2024] [Indexed: 06/05/2024]
Abstract
Antiferromagnets are a class of magnetic materials of great interest in spintronic devices because of their stability and ultrafast dynamics. When interfaced with an organic molecular layer, antiferromagnetic (AF) films are expected to form a spinterface that can allow fine control of specific AF properties. In this paper, we investigate spinterface effects on CoO, an AF oxide. To access the magnetic state of the antiferromagnet, we couple it to a ferromagnetic Co film via an exchange bias (EB) effect. In this way, the formation of a spinterface is detected through changes induced on the CoO/Co EB system. We demonstrate that C60 and Gaq3 adsorption on CoO shifts its blocking temperature; in turn, an increase in both the EB fields and the coercivities is observed on the EB-coupled Co layer. Ab initio calculations for the CoO/C60 interface indicate that the molecular adsorption is responsible for a charge redistribution on the CoO layer that alters the occupation of the d orbitals of Co atoms and, to a smaller extent, the p orbitals of oxygen. As a result, the AF coupling between Co atoms in the CoO is enhanced. Considering the granular nature of CoO, a larger AF stability upon molecular adsorption is then associated with a larger number of AF grains that are stable upon reversal of the Co layer.
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Affiliation(s)
- Luca Gnoli
- CNR
ISMN, Via Gobetti 101, 40129 Bologna, Italy
| | | | - Corrado Del Conte
- Department
of Physics and Astronomy “A. Righi”, University of Bologna, Via Berti-Pichat 6/2, I-40127 Bologna, Italy
| | | | | | - Manju Singh
- CNR
ISMN, Via Gobetti 101, 40129 Bologna, Italy
| | - Samuele Sanna
- Department
of Physics and Astronomy “A. Righi”, University of Bologna, Via Berti-Pichat 6/2, I-40127 Bologna, Italy
| | - Roshni Yadav
- Materials
Science and Engineering Department, National
Chung Hsing University, Taichung 402, Taiwan
| | - Ko-Wei Lin
- Materials
Science and Engineering Department, National
Chung Hsing University, Taichung 402, Taiwan
| | - Alessio Mezzi
- CNR
ISMN, Via Salaria km
29.300, 00015 Monterotondo
Scalo, Italy
| | - Simona Achilli
- Physics
Department, Università degli Studi
di Milano, Via Celoria 16, 20133 Milan, Italy
| | - Elena Molteni
- Physics
Department, Università degli Studi
di Milano, Via Celoria 16, 20133 Milan, Italy
| | - Marco Marino
- Physics
Department, Università degli Studi
di Milano, Via Celoria 16, 20133 Milan, Italy
| | - Guido Fratesi
- Physics
Department, Università degli Studi
di Milano, Via Celoria 16, 20133 Milan, Italy
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4
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Clyde DRM, Cortie DL, Granville S, Ware DC, Brothers PJ, Malmström J. Nanoscale Magnetic Arrays through Block Copolymer Templating of Polyoxometalates. NANO LETTERS 2024; 24:2165-2174. [PMID: 38329906 PMCID: PMC10885194 DOI: 10.1021/acs.nanolett.3c03825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
Magnetic nanoarrays promise to enable new energy-efficient computations based on spintronics or magnonics. In this work, we present a block copolymer-assisted strategy for fabricating ordered magnetic nanostructures on silicon and permalloy substrates. Block copolymer micelle-like structures were used as a template in which polyoxometalate (POM) clusters could assemble in an opal-like structure. A combination of microscopy and scattering techniques was used to confirm the structural and organizational features of the fabricated materials. The magnetic properties of these materials were investigated by polarized neutron reflectometry, nuclear magnetic resonance, and magnetometry measurements. The data show that a magnetic structural design was achieved and that a thin layer of patterned POMs strongly influenced an underlying permalloy layer. This work demonstrates that the bottom-up pathway is a potentially viable method for patterning magnetic substrates on a sub-100 nm scale, toward the magnetic nanostructures needed for spintronic or magnonic crystal devices.
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Affiliation(s)
- Daniel R M Clyde
- Department of Chemical and Materials Engineering, University of Auckland, Auckland 1010, New Zealand
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6012, New Zealand
| | - David L Cortie
- Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
| | - Simon Granville
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6012, New Zealand
- Robinson Research Institute, Victoria University of Wellington, Wellington 6012, New Zealand
| | - David C Ware
- School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand
| | - Penelope J Brothers
- Research School of Chemistry, Australian National University, Canberra, ACT 2600, Australia
| | - Jenny Malmström
- Department of Chemical and Materials Engineering, University of Auckland, Auckland 1010, New Zealand
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington 6012, New Zealand
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5
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Mutunga E, D'Angelo C, Tyagi P. Magnetic molecules lose identity when connected to different combinations of magnetic metal electrodes in MTJ-based molecular spintronics devices (MTJMSD). Sci Rep 2023; 13:16201. [PMID: 37758736 PMCID: PMC10533507 DOI: 10.1038/s41598-023-42731-9] [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: 05/14/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023] Open
Abstract
Understanding the magnetic molecules' interaction with different combinations of metal electrodes is vital to advancing the molecular spintronics field. This paper describes experimental and theoretical understanding showing how paramagnetic single-molecule magnet (SMM) catalyzes long-range effects on metal electrodes and, in that process, loses its basic magnetic properties. For the first time, our Monte Carlo simulations, verified for consistency with regards to experimental studies, discuss the properties of the whole device and a generic paramagnetic molecule analog (GPMA) connected to the combinations of ferromagnet-ferromagnet, ferromagnet-paramagnet, and ferromagnet-antiferromagnet metal electrodes. We studied the magnetic moment vs. magnetic field of GPMA exchange coupled between two metal electrodes along the exposed side edge of cross junction-shaped magnetic tunnel junction (MTJ). We also studied GPMA-metal electrode interfaces' magnetic moment vs. magnetic field response. We have also found that the MTJ dimension impacted the molecule response. This study suggests that SMM spin at the MTJ exposed sides offers a unique and high-yield method of connecting molecules to virtually endless magnetic and nonmagnetic electrodes and observing unprecedented phenomena in the molecular spintronics field.
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Affiliation(s)
- Eva Mutunga
- Mechanical Engineering, Center for Nanotechnology Research and Education (CNRE), University of the District of Columbia, 4200 Connecticut Ave. NW, Washington, DC, 20008, USA
| | - Christopher D'Angelo
- Mechanical Engineering, Center for Nanotechnology Research and Education (CNRE), University of the District of Columbia, 4200 Connecticut Ave. NW, Washington, DC, 20008, USA
| | - Pawan Tyagi
- Mechanical Engineering, Center for Nanotechnology Research and Education (CNRE), University of the District of Columbia, 4200 Connecticut Ave. NW, Washington, DC, 20008, USA.
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6
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Review of Fe-based spin crossover metal complexes in multiscale device architectures. Inorganica Chim Acta 2023. [DOI: 10.1016/j.ica.2022.121168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Bergenti I, Kamiya T, Li D, Riminucci A, Graziosi P, MacLaren DA, Rakshit RK, Singh M, Benini M, Tada H, Smogunov A, Dediu VA. Spinterface Effects in Hybrid La 0.7Sr 0.3MnO 3/SrTiO 3/C 60/Co Magnetic Tunnel Junctions. ACS APPLIED ELECTRONIC MATERIALS 2022; 4:4273-4279. [PMID: 36193212 PMCID: PMC9523579 DOI: 10.1021/acsaelm.2c00300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 08/10/2022] [Indexed: 06/16/2023]
Abstract
Orbital hybridization at the Co/C60 interface been has proved to strongly enhance the magnetic anisotropy of the cobalt layer, promoting such hybrid systems as appealing components for sensing and memory devices. Correspondingly, the same hybridization induces substantial variations in the ability of the Co/C60 interface to support spin-polarized currents and can bring out a spin-filtering effect. The knowledge of the effects at both sides allows for a better and more complete understanding of interfacial physics. In this paper we investigate the Co/C60 bilayer in the role of a spin-polarized electrode in the La0.7Sr0.3MnO3/SrTiO3/C60/Co configuration, thus substituting the bare Co electrode in the well-known La0.7Sr0.3MnO3/SrTiO3/Co magnetic tunnel junction. The study revealed that the spin polarization (SP) of the tunneling currents escaping from the Co/C60 electrode is generally negative: i.e., inverted with respect to the expected SP of the Co electrode. The observed sign of the spin polarization was confirmed via DFT calculations by considering the hybridization between cobalt and molecular orbitals.
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Affiliation(s)
- Ilaria Bergenti
- Institute
of Nanostructured Materials ISMN-CNR, Via Gobetti 101, Bologna 40129, Italy
| | - Takeshi Kamiya
- Department
of Materials Engineering Science, Osaka
University, 1-3, Machikaneyama, Toyonaka, Osaka, Japan 560-8531
| | - Dongzhe Li
- CEMES,
Université de Toulouse, CNRS, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - Alberto Riminucci
- Institute
of Nanostructured Materials ISMN-CNR, Via Gobetti 101, Bologna 40129, Italy
| | - Patrizio Graziosi
- Institute
of Nanostructured Materials ISMN-CNR, Via Gobetti 101, Bologna 40129, Italy
| | - Donald A. MacLaren
- SUPA,
School of Physics and Astronomy, University
of Glasgow, Glasgow G12 8QQ, U.K.
| | - Rajib K. Rakshit
- CSIR
- National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
| | - Manju Singh
- CSIR
- National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi 110012, India
| | - Mattia Benini
- Institute
of Nanostructured Materials ISMN-CNR, Via Gobetti 101, Bologna 40129, Italy
| | - Hirokazu Tada
- Department
of Materials Engineering Science, Osaka
University, 1-3, Machikaneyama, Toyonaka, Osaka, Japan 560-8531
| | - Alexander Smogunov
- Service de
Physique de l’Etat Condensé (SPEC), CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette
Cedex France
| | - Valentin A. Dediu
- Institute
of Nanostructured Materials ISMN-CNR, Via Gobetti 101, Bologna 40129, Italy
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8
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Li P, Zhou L, Zhao C, Ju H, Gao Q, Si W, Cheng L, Hao J, Li M, Chen Y, Jia C, Guo X. Single-molecule nano-optoelectronics: insights from physics. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2022; 85:086401. [PMID: 35623319 DOI: 10.1088/1361-6633/ac7401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Accepted: 05/27/2022] [Indexed: 06/15/2023]
Abstract
Single-molecule optoelectronic devices promise a potential solution for miniaturization and functionalization of silicon-based microelectronic circuits in the future. For decades of its fast development, this field has made significant progress in the synthesis of optoelectronic materials, the fabrication of single-molecule devices and the realization of optoelectronic functions. On the other hand, single-molecule optoelectronic devices offer a reliable platform to investigate the intrinsic physical phenomena and regulation rules of matters at the single-molecule level. To further realize and regulate the optoelectronic functions toward practical applications, it is necessary to clarify the intrinsic physical mechanisms of single-molecule optoelectronic nanodevices. Here, we provide a timely review to survey the physical phenomena and laws involved in single-molecule optoelectronic materials and devices, including charge effects, spin effects, exciton effects, vibronic effects, structural and orbital effects. In particular, we will systematically summarize the basics of molecular optoelectronic materials, and the physical effects and manipulations of single-molecule optoelectronic nanodevices. In addition, fundamentals of single-molecule electronics, which are basic of single-molecule optoelectronics, can also be found in this review. At last, we tend to focus the discussion on the opportunities and challenges arising in the field of single-molecule optoelectronics, and propose further potential breakthroughs.
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Affiliation(s)
- Peihui Li
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Li Zhou
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Cong Zhao
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Hongyu Ju
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
- School of Pharmaceutical Science and Technology, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, People's Republic of China
| | - Qinghua Gao
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Wei Si
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Li Cheng
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Jie Hao
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Mengmeng Li
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Yijian Chen
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
| | - Chuancheng Jia
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
- Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, 292 Chengfu Road, Haidian District, Beijing 100871, People's Republic of China
| | - Xuefeng Guo
- Center of Single-Molecule Sciences, Institute of Modern Optics, Frontiers Science Center for New Organic Matter, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, College of Electronic Information and Optical Engineering, Nankai University, 38 Tongyan Road, Jinnan District, Tianjin 300350, People's Republic of China
- Beijing National Laboratory for Molecular Sciences, National Biomedical Imaging Center, College of Chemistry and Molecular Engineering, Peking University, 292 Chengfu Road, Haidian District, Beijing 100871, People's Republic of China
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9
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Metzelaars M, Schleicher S, Hattori T, Borca B, Matthes F, Sanz S, Bürgler DE, Rawson J, Schneider CM, Kögerler P. Cyclophane with eclipsed pyrene units enables construction of spin interfaces with chemical accuracy. Chem Sci 2021; 12:8430-8437. [PMID: 34221324 PMCID: PMC8221062 DOI: 10.1039/d1sc01036k] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Advanced functionality in molecular electronics and spintronics is orchestrated by exact molecular arrangements at metal surfaces, but the strategies for constructing such arrangements remain limited. Here, we report the synthesis and surface hybridization of a cyclophane that comprises two pyrene groups fastened together by two ferrocene pillars. Crystallographic structure analysis revealed pyrene planes separated by ∼352 pm and stacked in an eclipsed geometry that approximates the rare configuration of AA-stacked bilayer graphene. We deposited this cyclophane onto surfaces of Cu(111) and Co(111) at submonolayer coverage and studied the resulting hybrid entities with scanning tunnelling microscopy (STM). We found distinct characteristics of this cyclophane on each metal surface: on non-magnetic Cu(111), physisorption occurred and the two pyrene groups remained electronically coupled to each other; on ferromagnetic Co(111) nanoislands, chemisorption occurred and the two pyrene groups became electronically decoupled. Spin-polarized STM measurements revealed that the ferrocene groups had spin polarization opposite to that of the surrounding Co metal, while the pyrene stack had no spin polarization. Comparisons to the non-stacked analogue comprising only one pyrene group bolster our interpretation of the cyclophane's STM features. The design strategy presented herein can be extended to realize versatile, three-dimensional platforms in single-molecule electronics and spintronics. A chemical strategy for the bottom-up construction of 3D spin interfaces is presented. Scanning tunnelling microscopy reveals distinct electronic features of a cyclophane with precisely designed pi-stacking on ferromagnetic Co(111) nanoislands.![]()
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Affiliation(s)
- Marvin Metzelaars
- Institute of Inorganic Chemistry, RWTH Aachen University 52074 Aachen Germany
| | | | - Takuma Hattori
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Bogdana Borca
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany .,National Institute of Materials Physics Atomistilor 405A, Magurele 077125 Ilfov Romania
| | - Frank Matthes
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Sergio Sanz
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Daniel E Bürgler
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Jeff Rawson
- Institute of Inorganic Chemistry, RWTH Aachen University 52074 Aachen Germany.,Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Claus M Schneider
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University 52074 Aachen Germany.,Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
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10
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Kumar KS, Ruben M. Sublimable Spin-Crossover Complexes: From Spin-State Switching to Molecular Devices. Angew Chem Int Ed Engl 2021; 60:7502-7521. [PMID: 31769131 PMCID: PMC8048919 DOI: 10.1002/anie.201911256] [Citation(s) in RCA: 122] [Impact Index Per Article: 40.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Indexed: 11/10/2022]
Abstract
Spin-crossover (SCO) active transition metal complexes are an important class of switchable molecular materials due to their bistable spin-state switching characteristics at or around room temperature. Vacuum-sublimable SCO complexes are a subclass of SCO complexes suitable for fabricating ultraclean spin-switchable films desirable for applications, especially in molecular electronics/spintronics. Consequently, on-surface SCO of thin-films of sublimable SCO complexes have been studied employing spectroscopy and microscopy techniques, and results of fundamental and technological importance have been obtained. This Review provides complete coverage of advances made in the field of vacuum-sublimable SCO complexes: progress made in the design and synthesis of sublimable functional SCO complexes, on-surface SCO of molecular and multilayer thick films, and various molecular and thin-film device architectures based on the sublimable SCO complexes.
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Affiliation(s)
- Kuppusamy Senthil Kumar
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)CNRS-Université de Strasbourg23, rue du Loess, BP 4367034Strasbourg cedex 2France
| | - Mario Ruben
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)CNRS-Université de Strasbourg23, rue du Loess, BP 4367034Strasbourg cedex 2France
- Institute of NanotechnologyKarlsruhe Institute of Technology (KIT)Hermann-von-Helmholtz-Platz 176344Eggenstein-LeopoldshafenGermany
- Institute of Quantum Materials and -TechnologyKarlsruhe Institute of Technology (KIT)Hermann-von-Helmholtz-Platz 176344Eggenstein-LeopoldshafenGermany
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11
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Bhattacharjee S, Lee SC. Cooperation and competition between magnetism and chemisorption. Phys Chem Chem Phys 2021; 23:3802-3809. [PMID: 33533337 DOI: 10.1039/d0cp06007k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Chemisorption on ferromagnetic and non-magnetic surfaces is discussed within the Newns-Anderson-Grimley model along with the Stoner model of ferromagnetism. In the case of ferromagnetic surfaces, the adsorption energy is formulated in terms of the change in surface magnetic moments. Using such a formulation, we address the issue of how an adsorbate's binding strength depends on the magnetic moments of the surface and how the adsorption process reduces/enhances the magnetic moments of the surface. Our results indicate a possible scaling relationship of adsorption energy in terms of surface magnetic moments. In the case of non-magnetic surfaces, we formulate a modified Stoner criterion and discuss the condition for the appearance of magnetism due to chemisorption on an otherwise non-magnetic surface.
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Affiliation(s)
| | - Seung-Cheol Lee
- Indo-Korea Science and Technology Center (IKST), Bangalore 560065, India.
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12
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Kumar KS, Ruben M. Sublimierbare Spin‐Crossover‐Komplexe: Vom Schalten des Spinzustands zu molekularen Bauelementen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201911256] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Kuppusamy Senthil Kumar
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) CNRS-Université de Strasbourg 23, rue du Loess, BP 43 67034 Strasbourg cedex 2 Frankreich
| | - Mario Ruben
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) CNRS-Université de Strasbourg 23, rue du Loess, BP 43 67034 Strasbourg cedex 2 Frankreich
- Institut für Nanotechnologie Karlsruher Institut für Technologie (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
- Institut für Quantenmaterialien und -technologien Karlsruher Institut für Technologie (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Deutschland
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13
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Bloom BP, Lu Y, Metzger T, Yochelis S, Paltiel Y, Fontanesi C, Mishra S, Tassinari F, Naaman R, Waldeck DH. Asymmetric reactions induced by electron spin polarization. Phys Chem Chem Phys 2020; 22:21570-21582. [PMID: 32697241 DOI: 10.1039/d0cp03129a] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Essential aspects of the chiral induced spin selectivity (CISS) effect and their implications for spin-controlled chemistry and asymmetric electrochemical reactions are described. The generation of oxygen through electrolysis is discussed as an example in which chirality-based spin-filtering and spin selection rules can be used to improve the reaction's efficiency and selectivity. Next the discussion shifts to illustrate how the spin selectivity of chiral molecules (CISS properties) allows one to use the electron spin as a chiral bias for inducing asymmetric reactions and promoting enantiospecific processes. Two enantioselective electrochemical reactions that have used polarized electron spins as a chiral reagent are described; enantioselective electroreduction to resolve an enantiomer from a racemic mixture and an oxidative electropolymerization to generate a chiral polymer from achiral monomers. A complementary approach that has used spin-polarized, but otherwise achiral, molecular films to enantiospecifically associate with one enantiomer from a racemic mixture is also discussed. Each of these reaction types use magnetized films to generate the spin polarized electrons and the enantiospecificity can be selected by choice of the magnetization direction, North pole versus South pole. Possible paths for future research in this area and its compatibility with existing methods based on chiral electrodes are discussed.
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Affiliation(s)
- B P Bloom
- Chemistry Department, University of Pittsburgh, Pittsburgh, PA 15260, USA.
| | - Y Lu
- Chemistry Department, University of Pittsburgh, Pittsburgh, PA 15260, USA.
| | - Tzuriel Metzger
- Applied Physics Department and the Center for Nano-Science and Nano-Technology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
| | - Shira Yochelis
- Applied Physics Department and the Center for Nano-Science and Nano-Technology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
| | - Yossi Paltiel
- Applied Physics Department and the Center for Nano-Science and Nano-Technology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
| | - Claudio Fontanesi
- Department of Engineering "Enzo Ferrari", DIEF, University of Modena and Reggio Emilia, 41125 Modena, Italy.
| | - Suryakant Mishra
- Dept. of Chemical and Biological Physics, Weizmann Institute, Rehovot 76100, Israel.
| | - Francesco Tassinari
- Dept. of Chemical and Biological Physics, Weizmann Institute, Rehovot 76100, Israel.
| | - Ron Naaman
- Dept. of Chemical and Biological Physics, Weizmann Institute, Rehovot 76100, Israel.
| | - D H Waldeck
- Chemistry Department, University of Pittsburgh, Pittsburgh, PA 15260, USA.
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