101
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Kuch W, Bernien M. Controlling the magnetism of adsorbed metal-organic molecules. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:023001. [PMID: 27841987 DOI: 10.1088/0953-8984/29/2/023001] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Gaining control on the size or the direction of the magnetic moment of adsorbed metal-organic molecules constitutes an important step towards the realization of a surface-mounted molecular spin electronics. Such control can be gained by taking advantage of interactions of the molecule's magnetic moment with the environment. The paramagnetic moments of adsorbed metal-organic molecules, for example, can be controlled by the interaction with magnetically ordered substrates. Metalloporphyrins and -phthalocyanines display a quasi-planar geometry, allowing the central metal ion to interact with substrate electronic states. This can lead to magnetic coupling with a ferromagnetic or even antiferromagnetic substrate. The molecule-substrate coupling can be mediated and controlled by insertion layers such as oxygen atoms, graphene, or nonmagnetic metal layers. Control on the magnetic properties of adsorbed metalloporphyrins or -phthalocyanines can also be gained by on-surface chemical modification of the molecules. The magnetic moment or the magnetic coupling to ferromagnetic substrates can be changed by adsorption and thermal desorption of small molecules that interact with the fourfold-coordinated metal center via the remaining axial coordination site. Spin-crossover molecules, which possess a metastable spin state that can be switched by external stimuli such as temperature or light, are another promising class of candidates for control of magnetic properties. However, the immobilization of such molecules on a solid surface often results in a quench of the spin transition due to the interaction with the substrate. We present examples of Fe(II) spin-crossover complexes in direct contact with a solid surface that undergo a reversible spin-crossover transition as a function of temperature, by illumination with visible light, or can be switched by the tip of a scanning tunneling microscope.
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Affiliation(s)
- Wolfgang Kuch
- Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
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102
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Kumar KS, Šalitroš I, Moreno-Pineda E, Ruben M. Spacer type mediated tunable spin crossover (SCO) characteristics of pyrene decorated 2,6-bis(pyrazol-1-yl)pyridine (bpp) based Fe(ii) molecular spintronic modules. Dalton Trans 2017; 46:9765-9768. [DOI: 10.1039/c7dt02219k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Two isomer-like, pyrene-decorated Fe(ii) spin crossover (SCO) complexes, [Fe(L1)2](BF4)2 and [Fe(L2)2](BF4)2, exhibit a dramatic 140 K (ΔT1/2) variation in their switching temperatures.
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Affiliation(s)
- Kuppusamy Senthil Kumar
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)
- CNRS-Université de Strasbourg
- 67034 Strasbourg cedex 2
- France
| | - Ivan Šalitroš
- Institute of Inorganic Chemistry
- Technology and Materials
- Faculty of Chemical and Food Technology
- Slovak University of Technology
- Bratislava
| | - Eufemio Moreno-Pineda
- Institute of Nanotechnology
- Karlsruhe Institute of Technology (KIT)
- Eggenstein-Leopoldshafen
- Germany
| | - Mario Ruben
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS)
- CNRS-Université de Strasbourg
- 67034 Strasbourg cedex 2
- France
- Institute of Nanotechnology
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103
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Schäfer B, Bauer T, Faus I, Wolny JA, Dahms F, Fuhr O, Lebedkin S, Wille HC, Schlage K, Chevalier K, Rupp F, Diller R, Schünemann V, Kappes MM, Ruben M. A luminescent Pt2Fe spin crossover complex. Dalton Trans 2017; 46:2289-2302. [DOI: 10.1039/c6dt04360g] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A heterotrinuclear luminescent [Pt2Fe] spin crossover (SCO) complex was developed, synthesized, and investigated.
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104
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Rat S, Ridier K, Vendier L, Molnár G, Salmon L, Bousseksou A. Solvatomorphism and structural-spin crossover property relationship in bis[hydrotris(1,2,4-triazol-1-yl)borate]iron(ii). CrystEngComm 2017. [DOI: 10.1039/c7ce00741h] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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105
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Song H, Fu C, Li N, Zhu H, Peng Z, Zhao W, Dai J, Xing L, Huang Z, Chen W, Wang Y, Yang J, Wu K. On the shuttling mechanism of a chlorine atom in a chloroaluminum phthalocyanine based molecular switch. Phys Chem Chem Phys 2017; 19:22401-22405. [DOI: 10.1039/c7cp03153j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A ClAlPc-based molecular switch works via the mechanism in which Cl is squeezed in between Al and an inner N-containing ring.
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106
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Deimel PS, Bababrik RM, Wang B, Blowey PJ, Rochford LA, Thakur PK, Lee TL, Bocquet ML, Barth JV, Woodruff DP, Duncan DA, Allegretti F. Direct quantitative identification of the "surface trans-effect". Chem Sci 2016; 7:5647-5656. [PMID: 30034702 PMCID: PMC6022009 DOI: 10.1039/c6sc01677d] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 06/08/2016] [Indexed: 02/03/2023] Open
Abstract
The strong parallels between coordination chemistry and adsorption on metal surfaces, with molecules and ligands forming local bonds to individual atoms within a metal surface, have been established over many years of study. The recently proposed "surface trans-effect" (STE) appears to be a further manifestation of this analogous behaviour, but so far the true nature of the modified molecule-metal surface bonding has been unclear. The STE could play an important role in determining the reactivities of surface-supported metal-organic complexes, influencing the design of systems for future applications. However, the current understanding of this effect is incomplete and lacks reliable structural parameters with which to benchmark theoretical calculations. Using X-ray standing waves, we demonstrate that ligation of ammonia and water to iron phthalocyanine (FePc) on Ag(111) increases the adsorption height of the central Fe atom; dispersion corrected density functional theory calculations accurately model this structural effect. The calculated charge redistribution in the FePc/H2O electronic structure induced by adsorption shows an accumulation of charge along the σ-bonding direction between the surface, the Fe atom and the water molecule, similar to the redistribution caused by ammonia. This apparent σ-donor nature of the observed STE on Ag(111) is shown to involve bonding to the delocalised metal surface electrons rather than local bonding to one or more surface atoms, thus indicating that this is a true surface trans-effect.
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Affiliation(s)
- Peter S Deimel
- Physics Department E20 , Technical University of Munich , 85748 Garching , Germany .
| | - Reda M Bababrik
- Center for Interfacial Reaction Engineering , School of Chemical, Biological and Materials Engineering , The University of Oklahoma , Norman , 73019-1004 Oklahoma , USA
| | - Bin Wang
- Center for Interfacial Reaction Engineering , School of Chemical, Biological and Materials Engineering , The University of Oklahoma , Norman , 73019-1004 Oklahoma , USA
| | - Phil J Blowey
- Diamond Light Source , Harwell Science and Innovation Campus , Didcot , OX11 0QX , UK .
- Department of Physics , University of Warwick , Coventry , CV4 7AL , UK
| | - Luke A Rochford
- Department of Chemistry , University of Warwick , Coventry , CV4 7AL , UK
| | - Pardeep K Thakur
- Diamond Light Source , Harwell Science and Innovation Campus , Didcot , OX11 0QX , UK .
| | - Tien-Lin Lee
- Diamond Light Source , Harwell Science and Innovation Campus , Didcot , OX11 0QX , UK .
| | - Marie-Laure Bocquet
- ENS - Department of Chemistry , PSL Research University , CNRS UMR 8640 PASTEUR , 75005 Paris , France
| | - Johannes V Barth
- Physics Department E20 , Technical University of Munich , 85748 Garching , Germany .
| | - D Phil Woodruff
- Department of Physics , University of Warwick , Coventry , CV4 7AL , UK
| | - David A Duncan
- Physics Department E20 , Technical University of Munich , 85748 Garching , Germany .
- Diamond Light Source , Harwell Science and Innovation Campus , Didcot , OX11 0QX , UK .
| | - Francesco Allegretti
- Physics Department E20 , Technical University of Munich , 85748 Garching , Germany .
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107
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Lefter C, Rat S, Costa JS, Manrique-Juárez MD, Quintero CM, Salmon L, Séguy I, Leichle T, Nicu L, Demont P, Rotaru A, Molnár G, Bousseksou A. Current Switching Coupled to Molecular Spin-States in Large-Area Junctions. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:7508-7514. [PMID: 27308873 DOI: 10.1002/adma.201601420] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Revised: 05/19/2016] [Indexed: 06/06/2023]
Abstract
The fabrication of large-area vertical junctions with a molecular spin-crossover complex displaying concerted changes of spin degrees of freedom and charge-transport properties is reported. Fabricated devices allow spin-state switching in the spin-crossover layer to be triggered and probed by optical means, while detecting associated changes in electrical resistance in the junctions.
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Affiliation(s)
- Constantin Lefter
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
- Faculty of Electrical Engineering and Computer Science & MANSiD Research Center, Stefan cel Mare University, 13, Str. Universitatii, Suceava, 720229, Romania
| | - Sylvain Rat
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
| | - José Sánchez Costa
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
| | - María D Manrique-Juárez
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
- LAAS, CNRS & Université de Toulouse, INSA, UPS, F-31077, Toulouse, France
| | - Carlos M Quintero
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
- LAAS, CNRS & Université de Toulouse, INSA, UPS, F-31077, Toulouse, France
| | - Lionel Salmon
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France
| | - Isabelle Séguy
- LAAS, CNRS & Université de Toulouse, INSA, UPS, F-31077, Toulouse, France
| | - Thierry Leichle
- LAAS, CNRS & Université de Toulouse, INSA, UPS, F-31077, Toulouse, France
| | - Liviu Nicu
- LAAS, CNRS & Université de Toulouse, INSA, UPS, F-31077, Toulouse, France
| | - Philippe Demont
- LPP-CIRIMAT, CNRS & Université de Toulouse III, 31062, Toulouse, France
| | - Aurelian Rotaru
- Faculty of Electrical Engineering and Computer Science & MANSiD Research Center, Stefan cel Mare University, 13, Str. Universitatii, Suceava, 720229, Romania.
| | - Gábor Molnár
- LCC, CNRS and Université de Toulouse, UPS, INP, F-31077, Toulouse, France.
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108
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Khusniyarov MM. How to Switch Spin-Crossover Metal Complexes at Constant Room Temperature. Chemistry 2016; 22:15178-15191. [DOI: 10.1002/chem.201601140] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Marat M. Khusniyarov
- Department of Chemistry and Pharmacy; Friedrich-Alexander University Erlangen-Nürnberg (FAU); Egerlandstr. 1 91058 Erlangen Germany
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109
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Frisenda R, Harzmann GD, Celis Gil JA, Thijssen JM, Mayor M, van der Zant HSJ. Stretching-Induced Conductance Increase in a Spin-Crossover Molecule. NANO LETTERS 2016; 16:4733-7. [PMID: 27088578 DOI: 10.1021/acs.nanolett.5b04899] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We investigate transport through mechanically triggered single-molecule switches that are based on the coordination sphere-dependent spin state of Fe(II)-species. In these molecules, in certain junction configurations the relative arrangement of two terpyridine ligands within homoleptic Fe(II)-complexes can be mechanically controlled. Mechanical pulling may thus distort the Fe(II) coordination sphere and eventually modify their spin state. Using the movable nanoelectrodes in a mechanically controlled break-junction at low temperature, current-voltage measurements at cryogenic temperatures support the hypothesized switching mechanism based on the spin-crossover behavior. A large fraction of molecular junctions formed with the spin-crossover-active Fe(II)-complex displays a conductance increase for increasing electrode separation and this increase can reach 1-2 orders of magnitude. Theoretical calculations predict a stretching-induced spin transition in the Fe(II)-complex and a larger transmission for the high-spin configuration.
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Affiliation(s)
- Riccardo Frisenda
- Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
| | | | - Jose A Celis Gil
- Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
| | - Joseph M Thijssen
- Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
| | - Marcel Mayor
- University of Base l, 4056 Basel, Switzerland
- Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, 76021 Karlsruhe, Germany
- Lehn Institute of Functional Materials (LIFM), Sun Yat-Sen University (SYSU) , Gunagzhou, China
| | - Herre S J van der Zant
- Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands
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110
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Molecular-scale dynamics of light-induced spin cross-over in a two-dimensional layer. Nat Commun 2016; 7:12212. [PMID: 27425776 PMCID: PMC4960305 DOI: 10.1038/ncomms12212] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 06/13/2016] [Indexed: 01/31/2023] Open
Abstract
Spin cross-over molecules show the unique ability to switch between two spin states when submitted to external stimuli such as temperature, light or voltage. If controlled at the molecular scale, such switches would be of great interest for the development of genuine molecular devices in spintronics, sensing and for nanomechanics. Unfortunately, up to now, little is known on the behaviour of spin cross-over molecules organized in two dimensions and their ability to show cooperative transformation. Here we demonstrate that a combination of scanning tunnelling microscopy measurements and ab initio calculations allows discriminating unambiguously between both states by local vibrational spectroscopy. We also show that a single layer of spin cross-over molecules in contact with a metallic surface displays light-induced collective processes between two ordered mixed spin-state phases with two distinct timescale dynamics. These results open a way to molecular scale control of two-dimensional spin cross-over layers. Spin crossover molecules may find applications in ultimately small magnetic devices, given the sensitivity of their spin-states to external stimuli. Here, the authors show a light-induced transition between two ordered dynamic phases in two-dimensional spin crossover layers on a metallic surface.
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111
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In Situ AFM Imaging of Microstructural Changes Associated with The Spin Transition in [Fe(Htrz)₂(Trz)](Bf₄) Nanoparticles. MATERIALS 2016; 9:ma9070537. [PMID: 28773659 PMCID: PMC5456918 DOI: 10.3390/ma9070537] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 06/23/2016] [Accepted: 06/28/2016] [Indexed: 11/21/2022]
Abstract
Topographic images of [Fe(Htrz)2(trz)](BF4) nanoparticles were acquired across the first-order spin transition using variable-temperature atomic force microscopy (AFM) in amplitude modulation mode. These studies revealed a complex morphology of the particles consisting of aggregates of small nanocrystals, which expand, separate and re-aggregate due to the mechanical stress during the spin-state switching events. Both reversible (prompt or slow recovery) and irreversible effects (fatigue) on the particle morphology were evidenced and correlated with the spin crossover properties.
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112
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Scheil K, Gopakumar TG, Bahrenburg J, Temps F, Maurer RJ, Reuter K, Berndt R. Switching of an Azobenzene-Tripod Molecule on Ag(111). J Phys Chem Lett 2016; 7:2080-2084. [PMID: 27193044 DOI: 10.1021/acs.jpclett.6b01011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The trans-cis isomerization makes azobenzene (AB) a robust molecular switch. Once adsorbed to a metal, however, the switching is inefficient or absent due to rapid excited-state quenching or loss of the trans-cis bistability. We find that tris-[4-(phenylazo)-phenyl]-amine is a rather efficient switch on Ag(111). Using scanning tunneling and atomic force microscopy at submolecular resolution along with density functional theory calculations, we show that the switching process is no trans-cis isomerization but rather a reorientation of the N-N bond of an AB unit. It proceeds through a twisting motion of the azo-bridge that leads to a lateral shift of a phenyl ring. Thus, the role of the Ag substrate is ambivalent. While it suppresses the original bistability of the azobenzene units, it creates a new one by inducing a barrier for the rotation of the N-N bond.
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Affiliation(s)
- Katharina Scheil
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität , 24098 Kiel, Germany
| | | | - Julia Bahrenburg
- Institut für Physikalische Chemie, Christian-Albrechts-Universität , 24098 Kiel, Germany
| | - Friedrich Temps
- Institut für Physikalische Chemie, Christian-Albrechts-Universität , 24098 Kiel, Germany
| | - Reinhard Johann Maurer
- Lehrstuhl für Theoretische Chemie, Technische Unversität München , 85747 Garching, Germany
| | - Karsten Reuter
- Lehrstuhl für Theoretische Chemie, Technische Unversität München , 85747 Garching, Germany
| | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität , 24098 Kiel, Germany
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113
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Raman and nuclear inelastic scattering study of the lattice dynamics of the [Fe(H 2 B(pz) 2 ) 2 (phen)] spin crossover complex. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.04.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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114
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Beniwal S, Zhang X, Mu S, Naim A, Rosa P, Chastanet G, Létard JF, Liu J, Sterbinsky GE, Arena DA, Dowben PA, Enders A. Surface-induced spin state locking of the [Fe(H2B(pz)2)2(bipy)] spin crossover complex. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:206002. [PMID: 27121917 DOI: 10.1088/0953-8984/28/20/206002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Temperature- and coverage-dependent studies of the Au(1 1 1)-supported spin crossover Fe(II) complex (SCO) of the type [Fe(H2B(pz)2)2(bipy)] with a suite of surface-sensitive spectroscopy and microscopy tools show that the substrate inhibits thermally induced transitions of the molecular spin state, so that both high-spin and low-spin states are preserved far beyond the spin transition temperature of free molecules. Scanning tunneling microscopy confirms that [Fe(H2B(pz)2)2(bipy)] grows as ordered, molecular bilayer islands at sub-monolayer coverage and as disordered film at higher coverage. The temperature dependence of the electronic structure suggest that the SCO films exhibit a mixture of spin states at room temperature, but upon cooling below the spin crossover transition the film spin state is best described as a mix of high-spin and low-spin state molecules of a ratio that is constant. This locking of the spin state is most likely the result of a substrate-induced conformational change of the interfacial molecules, but it is estimated that also the intra-atomic electron-electron Coulomb correlation energy, or Hubbard correlation energy U, could be an additional contributing factor.
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Affiliation(s)
- S Beniwal
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
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115
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Salazar C, Lach J, Rückerl F, Baumann D, Schimmel S, Knupfer M, Kersting B, Büchner B, Hess C. STM Study of Au(111) Surface-Grafted Paramagnetic Macrocyclic Complexes [Ni2L(Hmba)](+) via Ambidentate Coligands. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:4464-4471. [PMID: 27093097 DOI: 10.1021/acs.langmuir.6b00772] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Molecular anchoring and electronic properties of macrocyclic complexes fixed on gold surfaces have been investigated mainly by using scanning tunnelling microscopy (STM) and complemented with X-ray photoelectron spectroscopy (XPS). Exchange-coupled macrocyclic complexes [Ni2L(Hmba)](+) were deposited via 4-mercaptobenzoate ligands on the surface of a Au(111) single crystal from a mM solution of the perchlorate salt [Ni2L(Hmba)]ClO4 in dichloromethane. The combined results from STM and XPS show the formation of large monolayers anchored via Au-S bonds with a height of about 1.5 nm. Two apparent granular structures are visible: one related to the dinickel molecular complexes (cationic structures) and a second one related to the counterions ClO4(-) which stabilize the monolayer. No type of short and long-range order is observed. STM tip-interaction with the monolayer reveals higher degradation after 8 h of measurement. Spectroscopy measurements suggest a gap of about 2.5 eV between HOMO and LUMO of the cationic structures and smaller gap in the areas related to the anionic structures.
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Affiliation(s)
- Christian Salazar
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden) , Helmholtzstrasse 20, 01171 Dresden, Germany
| | - Jochen Lach
- Institut für Anorganische Chemie, Universität Leipzig , 04103 Leipzig, Germany
| | - Florian Rückerl
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden) , Helmholtzstrasse 20, 01171 Dresden, Germany
| | - Danny Baumann
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden) , Helmholtzstrasse 20, 01171 Dresden, Germany
| | - Sebastian Schimmel
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden) , Helmholtzstrasse 20, 01171 Dresden, Germany
| | - Martin Knupfer
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden) , Helmholtzstrasse 20, 01171 Dresden, Germany
| | - Berthold Kersting
- Institut für Anorganische Chemie, Universität Leipzig , 04103 Leipzig, Germany
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden) , Helmholtzstrasse 20, 01171 Dresden, Germany
- Center for Transport and Devices, Technische Universität Dresden , 01069 Dresden, Germany
| | - Christian Hess
- Leibniz Institute for Solid State and Materials Research (IFW-Dresden) , Helmholtzstrasse 20, 01171 Dresden, Germany
- Center for Transport and Devices, Technische Universität Dresden , 01069 Dresden, Germany
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116
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Yan Z, Liu W, Peng YY, Chen YC, Li QW, Ni ZP, Tong ML. Spin-Crossover Phenomenon in a Pentanuclear Iron(II) Cluster Helicate. Inorg Chem 2016; 55:4891-6. [DOI: 10.1021/acs.inorgchem.6b00416] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Zheng Yan
- Key
Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of
Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
- College
of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, P. R. China
| | - Wei Liu
- Key
Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of
Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Yuan-Yuan Peng
- Key
Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of
Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Yan-Cong Chen
- Key
Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of
Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Quan-Wen Li
- Key
Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of
Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Zhao-Ping Ni
- Key
Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of
Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
| | - Ming-Liang Tong
- Key
Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of
Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
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117
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Karan S, Berndt R. Generation of spin in single cholesterol molecules on gold. Phys Chem Chem Phys 2016; 18:9334-7. [PMID: 26948454 DOI: 10.1039/c5cp07410j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Compact islands of cholesterol on Au(111) were investigated with scanning tunneling microscopy at ∼5 K. Single molecules have been switched among several states, three of which exhibit a sharp spectroscopic feature at the Fermi level. This feature signals the presence of a localized spin and suggests that the molecule may be controllably switched between paramagnetic and diamagnetic states.
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Affiliation(s)
- Sujoy Karan
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
| | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.
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118
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Charge Transport and Electrical Properties of Spin Crossover Materials: Towards Nanoelectronic and Spintronic Devices. MAGNETOCHEMISTRY 2016. [DOI: 10.3390/magnetochemistry2010018] [Citation(s) in RCA: 143] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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119
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Gueddida S, Gruber M, Miyamachi T, Beaurepaire E, Wulfhekel W, Alouani M. Exchange Coupling of Spin-Crossover Molecules to Ferromagnetic Co Islands. J Phys Chem Lett 2016; 7:900-904. [PMID: 26895075 DOI: 10.1021/acs.jpclett.6b00172] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The properties of Fe(1,10-phenanthroline)2(NCS)2 (Fe-phen) molecules deposited on Co/Cu(111) are studied with scanning tunneling microscopy (STM) operated in ultrahigh vacuum at low temperature (4 K) and ab initio calculations. Both the experimental and theoretical results are used to identify the high-spin (HS) state of Fe-phen. Additionally, the calculations reveal a strong spin-polarization of the density of states (DOS) and is validated experimentally using the spin sensitivity of spin-polarized STM. Finally, it is shown that the magnetic moment of the Fe-ion within HS Fe-phen is strongly magnetically coupled to the underlying magnetic Co through the NCS groups. These findings enable promising spintronic perspectives.
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Affiliation(s)
- Saber Gueddida
- Institut de Physique et de Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Manuel Gruber
- Institut de Physique et de Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Toshio Miyamachi
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Eric Beaurepaire
- Institut de Physique et de Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Wulf Wulfhekel
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
- Institute of Nanotechnology, Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany
| | - Mebarek Alouani
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
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120
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Schütt C, Heitmann G, Wendler T, Krahwinkel B, Herges R. Design and Synthesis of Photodissociable Ligands Based on Azoimidazoles for Light-Driven Coordination-Induced Spin State Switching in Homogeneous Solution. J Org Chem 2016; 81:1206-15. [PMID: 26761623 DOI: 10.1021/acs.joc.5b02817] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Light-switchable azoimidazoles were rationally designed and synthesized, and their performance was investigated as photodissociable ligands (PDL) and for spin state switching of Ni porphyrins. The rationally designed ligands exhibit a high photochemical conversion rate (trans → cis > 98%) and no measurable fatigue over a large number of switching cycles at room temperature under air. As compared to the known phenylazopyridines, the phenylazoimidazoles exhibit a much stronger affinity as axial ligands to Ni porphyrin in the binding trans configuration and a low affinity in their cis form. This affinity switching was used to control the coordination number of Ni(2+). Concomitant with the change in coordination number is the change of the spin state from triplet (high spin) to singlet state (low spin). We report on phenylazoimidazole-based PDLs that switch the paramagnetic ratio of the investigated nickel species by up to 70%. Consequently, azoimidazoles exhibit considerably higher switching efficiencies than previously described pyridine-based PDLs.
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Affiliation(s)
- Christian Schütt
- Otto Diels-Institute for Organic Chemistry, University of Kiel , Otto-Hahn-Platz 4, Kiel D-24119, Germany
| | - Gernot Heitmann
- Otto Diels-Institute for Organic Chemistry, University of Kiel , Otto-Hahn-Platz 4, Kiel D-24119, Germany
| | - Thore Wendler
- Otto Diels-Institute for Organic Chemistry, University of Kiel , Otto-Hahn-Platz 4, Kiel D-24119, Germany
| | - Bahne Krahwinkel
- Otto Diels-Institute for Organic Chemistry, University of Kiel , Otto-Hahn-Platz 4, Kiel D-24119, Germany
| | - Rainer Herges
- Otto Diels-Institute for Organic Chemistry, University of Kiel , Otto-Hahn-Platz 4, Kiel D-24119, Germany
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121
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Aragonès AC, Aravena D, Cerdá JI, Acís-Castillo Z, Li H, Real JA, Sanz F, Hihath J, Ruiz E, Díez-Pérez I. Large Conductance Switching in a Single-Molecule Device through Room Temperature Spin-Dependent Transport. NANO LETTERS 2016; 16:218-26. [PMID: 26675052 DOI: 10.1021/acs.nanolett.5b03571] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Controlling the spin of electrons in nanoscale electronic devices is one of the most promising topics aiming at developing devices with rapid and high density information storage capabilities. The interface magnetism or spinterface resulting from the interaction between a magnetic molecule and a metal surface, or vice versa, has become a key ingredient in creating nanoscale molecular devices with novel functionalities. Here, we present a single-molecule wire that displays large (>10000%) conductance switching by controlling the spin-dependent transport under ambient conditions (room temperature in a liquid cell). The molecular wire is built by trapping individual spin crossover Fe(II) complexes between one Au electrode and one ferromagnetic Ni electrode in an organic liquid medium. Large changes in the single-molecule conductance (>100-fold) are measured when the electrons flow from the Au electrode to either an α-up or a β-down spin-polarized Ni electrode. Our calculations show that the current flowing through such an interface appears to be strongly spin-polarized, thus resulting in the observed switching of the single-molecule wire conductance. The observation of such a high spin-dependent conductance switching in a single-molecule wire opens up a new door for the design and control of spin-polarized transport in nanoscale molecular devices at room temperature.
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Affiliation(s)
- Albert C Aragonès
- Departament de Química Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain
- Institute for Bioengineering of Catalonia (IBEC) , Baldiri Reixac 15-21, 08028 Barcelona, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN) , Campus Río Ebro-Edificio I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
| | - Daniel Aravena
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona , Diagonal 645, 08028 Barcelona, Spain
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile (USACH) , Casilla 40, Correo 33, Santiago, Chile
| | - Jorge I Cerdá
- Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco , 28049 Madrid, Spain
| | - Zulema Acís-Castillo
- Institut de Ciència Molecular (ICMol), Universitat de València , 46980 Paterna, València, Spain
| | - Haipeng Li
- Department of Electrical and Computing Engineering, University of California-Davis , 2064 Kemper Hall, Davis, California 95616, United States
| | - José Antonio Real
- Institut de Ciència Molecular (ICMol), Universitat de València , 46980 Paterna, València, Spain
| | - Fausto Sanz
- Departament de Química Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain
- Institute for Bioengineering of Catalonia (IBEC) , Baldiri Reixac 15-21, 08028 Barcelona, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN) , Campus Río Ebro-Edificio I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
| | - Josh Hihath
- Department of Electrical and Computing Engineering, University of California-Davis , 2064 Kemper Hall, Davis, California 95616, United States
| | - Eliseo Ruiz
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona , Diagonal 645, 08028 Barcelona, Spain
| | - Ismael Díez-Pérez
- Departament de Química Física, Universitat de Barcelona , Martí i Franquès 1, 08028 Barcelona, Spain
- Institute for Bioengineering of Catalonia (IBEC) , Baldiri Reixac 15-21, 08028 Barcelona, Spain
- Centro Investigación Biomédica en Red (CIBER-BBN) , Campus Río Ebro-Edificio I+D, Poeta Mariano Esquillor s/n, 50018 Zaragoza, Spain
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122
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Lefter C, Tan R, Dugay J, Tricard S, Molnár G, Salmon L, Carrey J, Nicolazzi W, Rotaru A, Bousseksou A. Unidirectional electric field-induced spin-state switching in spin crossover based microelectronic devices. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2015.11.036] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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123
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Unruh D, Homenya P, Kumar M, Sindelar R, Garcia Y, Renz F. Spin state switching of metal complexes by visible light or hard X-rays. Dalton Trans 2016; 45:14008-18. [DOI: 10.1039/c6dt01745b] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Different kinds of stimuli to induce spin crossover in iron compounds are covered, focusing on electromagnetic irradiation-induced spin state switching phenomena in mono- as well as multinuclear coordination compounds.
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Affiliation(s)
- Daniel Unruh
- Institute of Inorganic Chemistry
- Leibniz Universität Hannover
- 30167 Hannover
- Germany
| | - Patrick Homenya
- Institute of Inorganic Chemistry
- Leibniz Universität Hannover
- 30167 Hannover
- Germany
| | - Manish Kumar
- Faculty II
- University of Applied Science and Arts
- 30459 Hannover
- Germany
| | - Ralf Sindelar
- Faculty II
- University of Applied Science and Arts
- 30459 Hannover
- Germany
| | - Yann Garcia
- Institute of Condensed Matter and Nanosciences
- Molecules
- Solids and Reactivity (IMCN/MOST)
- Université catholique de Louvain
- 1348 Louvain-la-Neuve
| | - Franz Renz
- Institute of Inorganic Chemistry
- Leibniz Universität Hannover
- 30167 Hannover
- Germany
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124
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Gardinier JR, Treleven AR, Meise KJ, Lindeman SV. Accessing spin-crossover behaviour in iron(ii) complexes of N-confused scorpionate ligands. Dalton Trans 2016; 45:12639-43. [DOI: 10.1039/c6dt01898j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Scorpionates with a dislocated pyrazolyl have been prepared on a large scale to allow new variations in iron(ii) spin-crossover materials.
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Affiliation(s)
| | - Alex R. Treleven
- Department of Chemistry
- Marquette University
- Milwaukee
- USA 53201-1881
| | - Kristin J. Meise
- Department of Chemistry
- Marquette University
- Milwaukee
- USA 53201-1881
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125
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Pointillart F, Liu X, Kepenekian M, Le Guennic B, Golhen S, Dorcet V, Roisnel T, Cador O, You Z, Hauser J, Decurtins S, Ouahab L, Liu SX. Thermal and near-infrared light induced spin crossover in a mononuclear iron(ii) complex with a tetrathiafulvalene-fused dipyridophenazine ligand. Dalton Trans 2016; 45:11267-71. [DOI: 10.1039/c6dt00920d] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A thermal and photo-induced spin transition in a tetrathiafulvalene-based Fe(ii) complex.
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126
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Thermal and Light-Induced Spin Transitions of FeIIComplexes with 4- and 5-(Phenylazo)-2,2′-bipyridine Ligands: Intra- vs. Intermolecular Effects. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201501252] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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127
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Harzmann GD, Frisenda R, van der Zant HSJ, Mayor M. Single‐Molecule Spin Switch Based on Voltage‐Triggered Distortion of the Coordination Sphere. Angew Chem Int Ed Engl 2015; 54:13425-30. [DOI: 10.1002/anie.201505447] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Revised: 07/16/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Gero D. Harzmann
- Department of Chemistry, University of Basel, St. Johanns‐Ring 19, 4056 Basel (Switzerland)
| | - Riccardo Frisenda
- Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft (The Netherlands)
| | - Herre S. J. van der Zant
- Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft (The Netherlands)
| | - Marcel Mayor
- Department of Chemistry, University of Basel, St. Johanns‐Ring 19, 4056 Basel (Switzerland)
- Institute for Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021 Karlsruhe (Germany)
- Lehn Institute of Functional Materials (LIFM), Sun Yat‐Sen University (SYSU), Guangzhou (China)
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128
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Harzmann GD, Frisenda R, van der Zant HSJ, Mayor M. Einzelmolekül‐Spinschalter auf Basis spannungsinduzierter Verzerrung der Koordinationssphäre. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505447] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gero D. Harzmann
- Departement Chemie, Universität Basel, St. Johanns‐Ring 19, 4056 Basel (Schweiz)
| | - Riccardo Frisenda
- Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology, Postfach 5046, 2600 GA <Delft (Niederlande)
| | - Herre S. J. van der Zant
- Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology, Postfach 5046, 2600 GA <Delft (Niederlande)
| | - Marcel Mayor
- Departement Chemie, Universität Basel, St. Johanns‐Ring 19, 4056 Basel (Schweiz)
- Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT), Postfach 3640, 76021 Karlsruhe (Deutschland)
- Lehn Institute of Functional Materials (LIFM), Sun Yat‐Sen University (SYSU), Guangzhou (China)
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129
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Bernien M, Naggert H, Arruda LM, Kipgen L, Nickel F, Miguel J, Hermanns CF, Krüger A, Krüger D, Schierle E, Weschke E, Tuczek F, Kuch W. Highly Efficient Thermal and Light-Induced Spin-State Switching of an Fe(II) Complex in Direct Contact with a Solid Surface. ACS NANO 2015; 9:8960-8966. [PMID: 26266974 DOI: 10.1021/acsnano.5b02840] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Spin crossover (SCO) complexes possess a bistable spin state that reacts sensitively to changes in temperature or excitation with light. These effects have been well investigated in solids and solutions, while technological applications require the immobilization and contacting of the molecules at surfaces, which often results in the suppression of the SCO. We report on the thermal and light-induced SCO of [Fe(bpz)2phen] molecules in direct contact with a highly oriented pyrolytic graphite surface. We are able to switch on the magnetic moment of the molecules by illumination with green light at T = 6 K, and off by increasing the temperature to 65 K. The light-induced switching process is highly efficient leading to a complete spin conversion from the low-spin to the high-spin state within a submonolayer of molecules. [Fe(bpz)2phen] complexes immobilized on weakly interacting graphite substrates are thus promising candidates to realize the vision of an optically controlled molecular logic unit for spintronic devices.
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Affiliation(s)
- Matthias Bernien
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
| | - Holger Naggert
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2, 24098 Kiel, Germany
| | - Lucas M Arruda
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
| | - Lalminthang Kipgen
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
| | - Fabian Nickel
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
| | - Jorge Miguel
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
| | - Christian F Hermanns
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
| | - Alex Krüger
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
| | - Dennis Krüger
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
| | - Enrico Schierle
- Helmholtz-Zentrum Berlin für Materialien und Energie , Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Eugen Weschke
- Helmholtz-Zentrum Berlin für Materialien und Energie , Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Felix Tuczek
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel , Max-Eyth-Straße 2, 24098 Kiel, Germany
| | - Wolfgang Kuch
- Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany
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130
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Gómez V, Sáenz de Pipaón C, Maldonado-Illescas P, Waerenborgh JC, Martin E, Benet-Buchholz J, Galán-Mascarós JR. Easy Excited-State Trapping and Record High TTIESST in a Spin-Crossover Polyanionic FeII Trimer. J Am Chem Soc 2015; 137:11924-7. [DOI: 10.1021/jacs.5b07879] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Verónica Gómez
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - Cristina Sáenz de Pipaón
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - Pilar Maldonado-Illescas
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - João Carlos Waerenborgh
- Centro
de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal
| | - Eddy Martin
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - Jordi Benet-Buchholz
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
| | - José Ramón Galán-Mascarós
- Institute of Chemical Research of Catalonia (ICIQ), Avinguda Paisos Catalans 16, E-43007 Tarragona, Spain
- Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluis Companys, 23, E-08010 Barcelona, Spain
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131
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Zhu L, Zou F, Gao JH, Fu YS, Gao GY, Fu HH, Wu MH, Lü JT, Yao KL. The integrated spintronic functionalities of an individual high-spin state spin-crossover molecule between graphene nanoribbon electrodes. NANOTECHNOLOGY 2015; 26:315201. [PMID: 26180074 DOI: 10.1088/0957-4484/26/31/315201] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The spin-polarized transport properties of a high-spin-state spin-crossover molecular junction with zigzag-edge graphene nanoribbon electrodes have been studied using density functional theory combined with the nonequilibrium Green's-function formalism. The molecular junction presents integrated spintronic functionalities such as negative differential resistance behavior, spin filter and the spin rectifying effect, associated with the giant magnetoresistance effect by tuning the external magnetic field. Furthermore, the transport properties are almost unaffected by the electrode temperature. The microscopic mechanism of these functionalities is discussed. These results represent a step toward multifunctional molecular spintronic devices on the level of the individual spin-crossover molecule.
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Affiliation(s)
- L Zhu
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
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132
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Valverde-Muñoz FJ, Gaspar AB, Shylin SI, Ksenofontov V, Real JA. Synthesis of Nanocrystals and Particle Size Effects Studies on the Thermally Induced Spin Transition of the Model Spin Crossover Compound [Fe(phen)2(NCS)2]. Inorg Chem 2015. [DOI: 10.1021/acs.inorgchem.5b00978] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Francisco Javier Valverde-Muñoz
- Institut de Ciència
Molecular/Departament de Química Inorgànica, Universitat de València, C/Catedratic José Beltrán Martínez,
2, 46980 Paterna, València, Spain
| | - Ana B. Gaspar
- Institut de Ciència
Molecular/Departament de Química Inorgànica, Universitat de València, C/Catedratic José Beltrán Martínez,
2, 46980 Paterna, València, Spain
| | - Sergii I. Shylin
- Institut für Anorganische und Analytsiche Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany
- Department of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska 64/13, 01601 Kyiv, Ukraine
| | - Vadim Ksenofontov
- Institut für Anorganische und Analytsiche Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany
| | - José A. Real
- Institut de Ciència
Molecular/Departament de Química Inorgànica, Universitat de València, C/Catedratic José Beltrán Martínez,
2, 46980 Paterna, València, Spain
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133
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Stock P, Spintig N, Scholz J, Epping JD, Oelsner C, Wiedemann D, Grohmann A, Hörner G. Spin-state dynamics of a photochromic iron(II) complex and its immobilization on oxide surfaces via phenol anchors. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1066778] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Philipp Stock
- Institut für Chemie, Technische Universität Berlin, Berlin, Germany
- Department of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
| | - Nicole Spintig
- Institut für Chemie, Technische Universität Berlin, Berlin, Germany
| | - Juliane Scholz
- Institut für Chemie, Technische Universität Berlin, Berlin, Germany
| | - Jan Dirk Epping
- Institut für Chemie, Technische Universität Berlin, Berlin, Germany
| | - Christian Oelsner
- Department Chemie und Pharmazie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Dennis Wiedemann
- Institut für Chemie, Technische Universität Berlin, Berlin, Germany
| | - Andreas Grohmann
- Institut für Chemie, Technische Universität Berlin, Berlin, Germany
| | - Gerald Hörner
- Institut für Chemie, Technische Universität Berlin, Berlin, Germany
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134
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Seredyuk M, Piñeiro-López L, Muñoz MC, Martínez-Casado FJ, Molnár G, Rodriguez-Velamazán JA, Bousseksou A, Real JA. Homoleptic Iron(II) Complexes with the Ionogenic Ligand 6,6′-Bis(1H-tetrazol-5-yl)-2,2′-bipyridine: Spin Crossover Behavior in a Singular 2D Spin Crossover Coordination Polymer. Inorg Chem 2015; 54:7424-32. [DOI: 10.1021/acs.inorgchem.5b01001] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Maksym Seredyuk
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, 46980 Paterna, Valencia, Spain
- Department of Physical Chemistry, National Taras Shevchenko University, Volodymyrska Str. 64, Kiev 01601, Ukraine
| | - Lucía Piñeiro-López
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, 46980 Paterna, Valencia, Spain
| | - M. Carmen Muñoz
- Departamento de Física Aplicada, Universitat Politècnica de València, 46022 Valencia, Valencia, Spain
| | | | - Gábor Molnár
- LCC, CNRS & Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - José Alberto Rodriguez-Velamazán
- Instituto
de Ciencia de Materiales de Aragón (ICMA), CSIC and Universidad de Zaragoza and Institut Laue-Langevin, 38042 Grenoble
Cedex 9, France
| | - Azzedine Bousseksou
- LCC, CNRS & Université de Toulouse (UPS, INP), 205 route de Narbonne, F-31077 Toulouse, France
| | - José Antonio Real
- Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, 46980 Paterna, Valencia, Spain
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135
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Karan S, Jacob D, Karolak M, Hamann C, Wang Y, Weismann A, Lichtenstein AI, Berndt R. Shifting the Voltage Drop in Electron Transport Through a Single Molecule. PHYSICAL REVIEW LETTERS 2015; 115:016802. [PMID: 26182113 DOI: 10.1103/physrevlett.115.016802] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Indexed: 06/04/2023]
Abstract
A Mn-porphyrin was contacted on Au(111) in a low-temperature scanning tunneling microscope (STM). Differential conductance spectra show a zero-bias resonance that is due to an underscreened Kondo effect according to many-body calculations. When the Mn center is contacted by the STM tip, the spectrum appears to invert along the voltage axis. A drastic change in the electrostatic potential of the molecule involving a small geometric relaxation is found to cause this observation.
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Affiliation(s)
- Sujoy Karan
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - David Jacob
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany
| | - Michael Karolak
- Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Christian Hamann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Yongfeng Wang
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Alexander Weismann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | | | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
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136
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Devid EJ, Martinho PN, Kamalakar MV, Šalitroš I, Prendergast Ú, Dayen JF, Meded V, Lemma T, González-Prieto R, Evers F, Keyes TE, Ruben M, Doudin B, van der Molen SJ. Spin transition in arrays of gold nanoparticles and spin crossover molecules. ACS NANO 2015; 9:4496-4507. [PMID: 25835284 DOI: 10.1021/acsnano.5b01103] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We investigate if the functionality of spin crossover molecules is preserved when they are assembled into an interfacial device structure. Specifically, we prepare and investigate gold nanoparticle arrays, into which room-temperature spin crossover molecules are introduced, more precisely, [Fe(AcS-BPP)2](ClO4)2, where AcS-BPP = (S)-(4-{[2,6-(dipyrazol-1-yl)pyrid-4-yl]ethynyl}phenyl)ethanethioate (in short, Fe(S-BPP)2). We combine three complementary experiments to characterize the molecule-nanoparticle structure in detail. Temperature-dependent Raman measurements provide direct evidence for a (partial) spin transition in the Fe(S-BPP)2-based arrays. This transition is qualitatively confirmed by magnetization measurements. Finally, charge transport measurements on the Fe(S-BPP)2-gold nanoparticle devices reveal a minimum in device resistance versus temperature, R(T), curves around 260-290 K. This is in contrast to similar networks containing passive molecules only that show monotonically decreasing R(T) characteristics. Backed by density functional theory calculations on single molecular conductance values for both spin states, we propose to relate the resistance minimum in R(T) to a spin transition under the hypothesis that (1) the molecular resistance of the high spin state is larger than that of the low spin state and (2) transport in the array is governed by a percolation model.
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Affiliation(s)
- Edwin J Devid
- †Huygens-Kamerlingh Onnes Laboratory, Leiden Institute of Physics, Leiden University P.O. Box 9504, 2300 RA Leiden, The Netherlands
| | - Paulo N Martinho
- ‡Centro de Química e Bioquímica (CQB), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
- ∥Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - M Venkata Kamalakar
- §Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Ivan Šalitroš
- ∥Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- ◊Department of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinskeho 9, SK-812 37, Bratislava, Slovakia
| | - Úna Prendergast
- ⊥School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
| | - Jean-François Dayen
- #Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS UMR 7504, Laboratory NIE, Université de Strasbourg, 23 Rue du Loess, 67034 Strasbourg, France
| | - Velimir Meded
- ∥Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Tibebe Lemma
- ⊥School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
| | - Rodrigo González-Prieto
- ∥Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- ¶Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Ciudad Universitaria, E-28040 Madrid, Spain
| | - Ferdinand Evers
- ∥Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- △Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Straße 1, D-76128 Karlsruhe, Germany
| | - Tia E Keyes
- ⊥School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
| | - Mario Ruben
- ∥Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- #Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS UMR 7504, Laboratory NIE, Université de Strasbourg, 23 Rue du Loess, 67034 Strasbourg, France
| | - Bernard Doudin
- #Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS UMR 7504, Laboratory NIE, Université de Strasbourg, 23 Rue du Loess, 67034 Strasbourg, France
| | - Sense Jan van der Molen
- †Huygens-Kamerlingh Onnes Laboratory, Leiden Institute of Physics, Leiden University P.O. Box 9504, 2300 RA Leiden, The Netherlands
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137
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Poneti G, Poggini L, Mannini M, Cortigiani B, Sorace L, Otero E, Sainctavit P, Magnani A, Sessoli R, Dei A. Thermal and optical control of electronic states in a single layer of switchable paramagnetic molecules. Chem Sci 2015; 6:2268-2274. [PMID: 29308140 PMCID: PMC5645729 DOI: 10.1039/c5sc00163c] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 02/12/2015] [Indexed: 11/21/2022] Open
Abstract
The control of the charge distribution in a monolayer of switchable cobalt-dioxolene complexes undergoing Valence Tautomerism (VT) has been achieved by means of thermal and optical stimuli. Thiol-derivatised VT molecules have been grafted on polycrystalline gold surface as monolayers from solution. X-ray photoelectron spectroscopy and time-of-flight secondary ions mass spectrometry evidenced the formation of a covalent bond between intact VT molecules and the surface and excluded the presence of physisorbed molecules. X-ray absorption spectroscopy revealed that the temperature- and light-induced conversion profiles of the monolayer closely reproduce the ones found for the crystalline phase. This study demonstrates that a wet chemistry based approach allows to transfer switchable paramagnetic molecules at the nanoscale, widening the playground to develop new hybrid molecular based architectures for novel technologies.
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Affiliation(s)
- Giordano Poneti
- University of Florence , Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence , via della Lastruccia 3-13 , 50019 Sesto Fiorentino , Italy . ; ; ; Tel: +39 055 4573269
- "Guglielmo Marconi" University , Department of Applied Science and Technology , via Plinio 44 , 00193 Roma , Italy
| | - Lorenzo Poggini
- University of Florence , Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence , via della Lastruccia 3-13 , 50019 Sesto Fiorentino , Italy . ; ; ; Tel: +39 055 4573269
| | - Matteo Mannini
- University of Florence , Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence , via della Lastruccia 3-13 , 50019 Sesto Fiorentino , Italy . ; ; ; Tel: +39 055 4573269
| | - Brunetto Cortigiani
- University of Florence , Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence , via della Lastruccia 3-13 , 50019 Sesto Fiorentino , Italy . ; ; ; Tel: +39 055 4573269
| | - Lorenzo Sorace
- University of Florence , Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence , via della Lastruccia 3-13 , 50019 Sesto Fiorentino , Italy . ; ; ; Tel: +39 055 4573269
| | - Edwige Otero
- Synchrotron SOLEIL , BP 48 91192 Gif-Sur-Yvette , France
| | - Philippe Sainctavit
- Institut de Minéralogie , de Physique des Matériaux et de Cosmochimie , UMR7590 CNRS , Université Pierre et Marie Curie (Paris 6) , 4 place Jussieu , 75252 Paris , France
| | - Agnese Magnani
- University of Siena , Department of Biotechnologies , Chemistry and Pharmacy , INSTM Research Unit of Siena , Via A. Moro 2 , 53100 Siena , Italy
| | - Roberta Sessoli
- University of Florence , Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence , via della Lastruccia 3-13 , 50019 Sesto Fiorentino , Italy . ; ; ; Tel: +39 055 4573269
| | - Andrea Dei
- University of Florence , Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence , via della Lastruccia 3-13 , 50019 Sesto Fiorentino , Italy . ; ; ; Tel: +39 055 4573269
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138
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Dugay J, Giménez-Marqués M, Kozlova T, Zandbergen HW, Coronado E, van der Zant HSJ. Spin switching in electronic devices based on 2D assemblies of spin-crossover nanoparticles. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:1288-1293. [PMID: 25556348 DOI: 10.1002/adma.201404441] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 11/06/2014] [Indexed: 06/04/2023]
Abstract
Two-dimensional assemblies of triazole-based spin-crossover nanoparticles (SCO NPs) presenting different morphologies are prepared and electrically characterized. The thermal hysteresis loop in the electrical conductance near room temperature correlates with the NP morphologies and their 2D organization. The unprecedentedly large difference - up to two orders of magnitude - in the electrical conductance of the two spin states is of interest for applications.
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Affiliation(s)
- Julien Dugay
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628, CJ, Delft, The Netherlands
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139
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Romero-Morcillo T, Valverde-Muñoz FJ, Piñeiro-López L, Muñoz MC, Romero T, Molina P, Real JA. Spin crossover in iron(ii) complexes with ferrocene-bearing triazole-pyridine ligands. Dalton Trans 2015; 44:18911-8. [DOI: 10.1039/c5dt03084f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Thermal- and light-induced spin crossover properties of two iron(ii) complexes derived from a ferrocene-appended triazole-pyridine ligand are described.
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Affiliation(s)
| | | | - Lucía Piñeiro-López
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
| | - M. Carmen Muñoz
- Departamento de Física Aplicada
- Universitat Politècnica de València
- Spain
| | - Tomás Romero
- Departamento de Química Orgánica
- Facultad de Química
- Campus de Espinardo
- Universidad de Murcia
- E-30100 Murcia
| | - Pedro Molina
- Departamento de Química Orgánica
- Facultad de Química
- Campus de Espinardo
- Universidad de Murcia
- E-30100 Murcia
| | - José A. Real
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- 46980 Paterna
- Spain
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140
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Zhang JL, Zhong JQ, Lin JD, Hu WP, Wu K, Xu GQ, Wee ATS, Chen W. Towards single molecule switches. Chem Soc Rev 2015; 44:2998-3022. [DOI: 10.1039/c4cs00377b] [Citation(s) in RCA: 247] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Scanning tunneling microscope (STM) controlled reversible switching of a single-dipole molecule imbedded in hydrogen-bonded binary molecular networks on graphite.
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Affiliation(s)
- Jia Lin Zhang
- Department of Chemistry
- National University of Singapore
- Singapore
- Department of Physics
- National University of Singapore
| | - Jian Qiang Zhong
- Department of Chemistry
- National University of Singapore
- Singapore
- Department of Physics
- National University of Singapore
| | - Jia Dan Lin
- Department of Chemistry
- National University of Singapore
- Singapore
- Department of Physics
- National University of Singapore
| | - Wen Ping Hu
- School of Science
- Tianjin University
- Tian Jin
- China
| | - Kai Wu
- Singapore-Peking University Research Center for a Sustainable Low-Carbon Future
- Singapore
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Guo Qin Xu
- Department of Chemistry
- National University of Singapore
- Singapore
- Singapore-Peking University Research Center for a Sustainable Low-Carbon Future
- Singapore
| | | | - Wei Chen
- Department of Chemistry
- National University of Singapore
- Singapore
- Department of Physics
- National University of Singapore
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141
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Cimatti I, Ninova S, Lanzilotto V, Malavolti L, Rigamonti L, Cortigiani B, Mannini M, Magnano E, Bondino F, Totti F, Cornia A, Sessoli R. UHV deposition and characterization of a mononuclear iron(III) β-diketonate complex on Au(111). BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:2139-48. [PMID: 25551042 PMCID: PMC4273306 DOI: 10.3762/bjnano.5.223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 10/23/2014] [Indexed: 06/04/2023]
Abstract
The adsorption of the sterically hindered β-diketonate complex Fe(dpm)3, where Hdpm = dipivaloylmethane, on Au(111) was investigated by ultraviolet photoelectron spectroscopy (UPS) and scanning tunnelling microscopy (STM). The high volatility of the molecule limited the growth of the film to a few monolayers. While UPS evidenced the presence of the β-diketonate ligands on the surface, the integrity of the molecule on the surface could not be assessed. The low temperature STM images were more informative and at submonolayer coverage they showed the presence of regular domains characterized by a flat morphology and height of ≈0.3 nm. Along with these domains, tetra-lobed features adsorbed on the kinks of the herringbone were also observed. DFT-simulated images of the pristine molecule and its possible decomposition products allowed to assess the partial fragmentation of Fe(dpm)3 upon adsorption on the Au(111) surface. Structural features with intact molecules were only observed for the saturation coverage. An ex situ prepared thick film of the complex was also investigated by X-ray magnetic circular dichroism (XMCD) and features typical of high-spin iron(III) in octahedral environment were observed.
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Affiliation(s)
- Irene Cimatti
- Laboratory of Molecular Magnetism, Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Silviya Ninova
- Laboratory of Molecular Magnetism, Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Valeria Lanzilotto
- Laboratory of Molecular Magnetism, Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Luigi Malavolti
- Laboratory of Molecular Magnetism, Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Luca Rigamonti
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia & INSTM RU of Modena and Reggio Emilia, Via G. Campi 183, 41125 Modena, Italy
| | - Brunetto Cortigiani
- Laboratory of Molecular Magnetism, Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Matteo Mannini
- Laboratory of Molecular Magnetism, Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Elena Magnano
- CNR-IOM, Laboratorio TASC, Basovizza SS-14, Km 163.5, 34149 Trieste, Italy
| | - Federica Bondino
- CNR-IOM, Laboratorio TASC, Basovizza SS-14, Km 163.5, 34149 Trieste, Italy
| | - Federico Totti
- Laboratory of Molecular Magnetism, Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Andrea Cornia
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia & INSTM RU of Modena and Reggio Emilia, Via G. Campi 183, 41125 Modena, Italy
| | - Roberta Sessoli
- Laboratory of Molecular Magnetism, Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
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142
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Koo YS, Galán-Mascarós JR. Spin crossover probes confer multistability to organic conducting polymers. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:6785-9. [PMID: 25183547 DOI: 10.1002/adma.201402579] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2014] [Revised: 07/18/2014] [Indexed: 05/28/2023]
Abstract
Switchable organic conductors can be readily obtained by combining organic conducting polymers (CPs), with the unparalleled bistability of spin crossover (SCO) complexes. Here it is reported how CPs with embedded SCO components exhibit synergic multistability. Upon acting on the SCO probes by external stimuli (thermal activation in this case), the spin transition induces up to a 300% difference in the electrical conductivity of the CP component between the low-spin and high-spin regimes, and with a wide hysteresis at technologically relevant temperatures. These results pave the way for the exploitation of the unique SCO switching capabilities in electronic devices.
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Affiliation(s)
- Yong-Sung Koo
- Institute of Chemical Research of Catalonia (ICIQ), Av. Paisos Catalans 16, E-43007, Tarragona, Spain
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143
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Abstract
The study of spin crossover compounds by means of theoretical or experimental approaches has provided interesting results in recent decades. The main feature of such compounds is the change in the spin state induced by many different external stimuli, i.e. temperature, light, pressure, solvent coordination and the electric field. Spin crossover systems are potentially more useful than other magnetic molecules because their switching behaviour can occur closer to room temperature, and they are thus candidates for use in spintronic devices. Here, I review the state of the art in quantum chemical approaches to the study of such systems and discuss experiments that have focused on transport properties in single-molecule, nano-objects or thin-film spin crossover systems.
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Affiliation(s)
- Eliseo Ruiz
- Departament de Química Inorgànica and Centre de Recerca en Química Teòrica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain.
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144
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Kulmaczewski R, Shepherd HJ, Cespedes O, Halcrow MA. A Homologous Series of [Fe(H2Bpz2)2(L)] Spin-Crossover Complexes with Annelated Bipyridyl Co-Ligands. Inorg Chem 2014; 53:9809-17. [DOI: 10.1021/ic501402q] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Rafal Kulmaczewski
- School
of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
| | - Helena J. Shepherd
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, U.K
| | - Oscar Cespedes
- School of Physics and Astronomy, University of Leeds, E. C. Stoner Building, Leeds LS2 9JT, U.K
| | - Malcolm A. Halcrow
- School
of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, U.K
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145
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Schäfer B, Rajnák C, Šalitroš I, Fuhr O, Klar D, Schmitz-Antoniak C, Weschke E, Wende H, Ruben M. Room temperature switching of a neutral molecular iron(II) complex. Chem Commun (Camb) 2014; 49:10986-8. [PMID: 24136154 DOI: 10.1039/c3cc46624h] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abrupt room temperature switching (T(c) = 295 K with a 5 K hysteresis) was achieved in a neutral Fe(II) complex based on a 2-(1H-pyrazol-1-yl)-6-(1H-tetrazol-5-yl)pyridine ligand. Structural characterization and spin crossover study (via SQUID magnetometry, photoexcitation and X-ray absorption spectroscopy) in the solid state are described.
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Affiliation(s)
- Bernhard Schäfer
- Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Postfach 3640, 76021 Karlsruhe, Germany.
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146
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147
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Hernández EM, Quintero CM, Kraieva O, Thibault C, Bergaud C, Salmon L, Molnár G, Bousseksou A. AFM imaging of molecular spin-state changes through quantitative thermomechanical measurements. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:2889-2893. [PMID: 24510733 DOI: 10.1002/adma.201305539] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 12/06/2013] [Indexed: 06/03/2023]
Abstract
Quantitative atomic force microscopy is used in conjunction with microwire heaters for high-resolution imaging of the Young's modulus changes across the spin-state transition. When going from the high spin to the low spin state, a significant stiffening is observed.
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148
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Karan S, Gopakumar TG, Jacob H, Meyer S, Tuczek F, Berndt R. Remotely Triggered Geometrical Isomerization of a Binuclear Complex. J Am Chem Soc 2014; 136:6163-6. [DOI: 10.1021/ja500154g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Sujoy Karan
- Institut
für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | | | - Hanne Jacob
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Sven Meyer
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Felix Tuczek
- Institut
für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Richard Berndt
- Institut
für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
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149
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Ludwig E, Naggert H, Kalläne M, Rohlf S, Kröger E, Bannwarth A, Quer A, Rossnagel K, Kipp L, Tuczek F. Iron(II) Spin-Crossover Complexes in Ultrathin Films: Electronic Structure and Spin-State Switching by Visible and Vacuum-UV Light. Angew Chem Int Ed Engl 2014; 53:3019-23. [DOI: 10.1002/anie.201307968] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 11/20/2013] [Indexed: 11/08/2022]
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150
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Ludwig E, Naggert H, Kalläne M, Rohlf S, Kröger E, Bannwarth A, Quer A, Rossnagel K, Kipp L, Tuczek F. FeII-Spincrossover-Komplexe in ultradünnen Filmen: elektronische Struktur und Spinschaltung durch sichtbares und Vakuum-UV-Licht. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201307968] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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