151
|
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]
|
152
|
Palii A, Clemente-Juan JM, Tsukerblat B, Coronado E. Electric field control of the optical properties in magnetic mixed-valence molecules. Chem Sci 2014. [DOI: 10.1039/c4sc01056f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In delocalized magnetic mixed-valence molecules the spin-crossover induced by an electric field may have a strong influence on their optical properties.
Collapse
Affiliation(s)
- Andrew Palii
- Institute of Applied Physics
- Academy of Sciences of Moldova
- Kishinev, Moldova
| | | | - Boris Tsukerblat
- Department of Chemistry
- Ben-Gurion University of the Negev
- Beer-Sheva, 84105 Israel
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol)
- Universidad de Valencia
- E-46980 Paterna, Spain
| |
Collapse
|
153
|
Dommaschk M, Schütt C, Venkataramani S, Jana U, Näther C, Sönnichsen FD, Herges R. Rational design of a room temperature molecular spin switch. The light-driven coordination induced spin state switch (LD-CISSS) approach. Dalton Trans 2014; 43:17395-405. [DOI: 10.1039/c4dt03048f] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A record player type molecule changes spin state reversibly upon irradiation with green and blue light in solution at room temperature without measureable fatigue.
Collapse
Affiliation(s)
- M. Dommaschk
- Otto-Diels-Institut für Organische Chemie
- Christian-Albrechts-Universität
- D-24098 Kiel, Germany
| | - C. Schütt
- Otto-Diels-Institut für Organische Chemie
- Christian-Albrechts-Universität
- D-24098 Kiel, Germany
| | - S. Venkataramani
- Indian Institute for Science Education and Research (IISER) Mohali
- Manauli PO 140306, India
| | - U. Jana
- Department of Chemistry
- Jadavpur University
- Kolkata-700032, India
| | - C. Näther
- Institut für Anorganische Chemie
- Christian-Albrechts-Universität
- 24098 Kiel, Germany
| | - F. D. Sönnichsen
- Otto-Diels-Institut für Organische Chemie
- Christian-Albrechts-Universität
- D-24098 Kiel, Germany
| | - R. Herges
- Otto-Diels-Institut für Organische Chemie
- Christian-Albrechts-Universität
- D-24098 Kiel, Germany
| |
Collapse
|
154
|
Wiedemann D, Grohmann A. Bulk spin-crossover in the complex [FeL(NCS)2] of a tris(pyridyl)ethane-derived N4-ligand—a temperature-dependent crystallographic study. Dalton Trans 2014; 43:2406-17. [DOI: 10.1039/c3dt53070a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
155
|
Halcrow MA. Recent advances in the synthesis and applications of 2,6-dipyrazolylpyridine derivatives and their complexes. NEW J CHEM 2014. [DOI: 10.1039/c3nj00835e] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
156
|
Zhang X, Palamarciuc T, Létard JF, Rosa P, Lozada EV, Torres F, Rosa LG, Doudin B, Dowben PA. The spin state of a molecular adsorbate driven by the ferroelectric substrate polarization. Chem Commun (Camb) 2014; 50:2255-7. [DOI: 10.1039/c3cc46892e] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
157
|
Schmidt SO, Kisslinger S, Würtele C, Bonnet S, Schindler S, Tuczek F. Iron(II) Complexes Supported by a Tetradentate Ligand Providing a Strained Equatorial Coordination Environment: Geometric and Electronic-Structural Implications. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300425] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
158
|
Poneti G, Mannini M, Cortigiani B, Poggini L, Sorace L, Otero E, Sainctavit P, Sessoli R, Dei A. Magnetic and spectroscopic investigation of thermally and optically driven valence tautomerism in thioether-bridged dinuclear cobalt-dioxolene complexes. Inorg Chem 2013; 52:11798-805. [PMID: 24090074 DOI: 10.1021/ic4011949] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of dinuclear cobalt complexes of general formula [Co(Mentpa)(diox-S-diox)Co(Mentpa)](PF6)2·MeOH (n = 0, 2, 3) was prepared through the synthesis of the bis-bidentate ligand 6,6'-((1,4-phenylenebis(methylene))bis(sulfanediyl))bis(3,5-di-tert-butyl-benzene-1,2-diol) (diox-S-diox). The ancillary ligands Mentpa are obtained by the tripodal tris(2-pyridylmethyl)amine (tpa) ligand through successive introduction of methyl groups into the 6 position of the pyridine moieties. As expected, the steric hindrance induced by this substitution modulates the redox properties of the metal acceptor, determining the charge distribution of the metal-dioxolene adduct at room temperature. Magnetic measurements and X-ray photoelectron and X-ray absorption spectroscopies indicate that the charge distributions low-spin-Co(III)-catecholate and high-spin-Co(II)-semiquinonate characterize the complexes formed by the tpa and Me3tpa tetradentate ligands, respectively. The complex formed by the Me2tpa ligand undergoes a thermal- and light-induced interconversion of the two states, in agreement with the existence of a valence tautomeric equilibrium. All complexes were stable and behaved reproducibly under X-ray irradiation. This work points out a fast and simple chemical approach to structurally and electronically modify the catechol ring while leaving its coordination capabilities unaffected. These findings afford a robust chemical method to prepare sulfur-functionalized dioxolene ligands as new molecular bricks for chemical functionalization of noble metal surfaces with this class of molecular switches.
Collapse
Affiliation(s)
- Giordano Poneti
- Laboratory of Molecular Magnetism (LaMM), Dipartimento di Chimica 'Ugo Schiff', Università degli Studi di Firenze & INSTM RU of Firenze , via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | | | | | | | | | | | | | | | | |
Collapse
|
159
|
Gopakumar TG, Bernien M, Naggert H, Matino F, Hermanns CF, Bannwarth A, Mühlenberend S, Krüger A, Krüger D, Nickel F, Walter W, Berndt R, Kuch W, Tuczek F. Spin-crossover complex on Au(111): structural and electronic differences between mono- and multilayers. Chemistry 2013; 19:15702-9. [PMID: 24123564 DOI: 10.1002/chem.201302241] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Indexed: 11/10/2022]
Abstract
Submono-, mono- and multilayers of the Fe(II) spin-crossover (SCO) complex [Fe(bpz)2 (phen)] (bpz=dihydrobis(pyrazolyl)borate, phen=1,10-phenanthroline) have beenprepared by vacuum deposition on Au(111) substrates and investigated with near edge X-ray absorption fine structure (NEXAFS) spectroscopy and scanning tunneling microscopy (STM). As evidenced by NEXAFS, molecules of the second layer exhibit a thermal spin crossover transition, although with a more gradual characteristics than in the bulk. For mono- and submonolayers of [Fe(bpz)2 (phen)] deposited on Au(111) substrates at room temperature both NEXAFS and STM indicate a dissociation of [Fe(bpz)2 (phen)] on Au(111) into four-coordinate complexes, [Fe(bpz)2 ], and phen molecules. Keeping the gold substrate at elevated temperatures ordered monolayers of intact molecules of [Fe(bpz)2 (phen)] are formed which can be spin-switched by electron-induced excited spin-state trapping (ELIESST).
Collapse
Affiliation(s)
- Thiruvancheril G Gopakumar
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel (Germany)
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
160
|
Milek M, Heinemann FW, Khusniyarov MM. Spin Crossover Meets Diarylethenes: Efficient Photoswitching of Magnetic Properties in Solution at Room Temperature. Inorg Chem 2013; 52:11585-92. [DOI: 10.1021/ic401960x] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Magdalena Milek
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen−Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
| | - Frank W. Heinemann
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen−Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
| | - Marat M. Khusniyarov
- Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen−Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
| |
Collapse
|
161
|
Jacob H, Kathirvel K, Petersen F, Strunskus T, Bannwarth A, Meyer S, Tuczek F. Grafting of functionalized [Fe(III)(salten)] complexes to Au(111) surfaces via thiolate groups: surface spectroscopic characterization and comparison of different linker designs. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:8534-8543. [PMID: 23751117 DOI: 10.1021/la400663y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Functionalization of surfaces with spin crossover complexes is an intensively studied topic. Starting from dinuclear iron(III)-salten complexes [Fe(salten)(pyS)]2(BPh4)2 and [Fe(thiotolylsalten)(NCS)]2 with disulfide-containing bridging ligands, corresponding mononuclear complexes [Fe(salten)(pyS)](+) and [Fe(thiotolylsalten)(NCS)] are covalently attached to Au(111) surfaces (pySH, pyridinethiol; salten, bis(3-salicylidene-aminopropyl)amine). The adsorbed monolayers are investigated by infrared reflection absorption spectroscopy (IRRAS) in combination with X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS). Comparison of the surface vibrational spectra with bulk data allows us to draw conclusions with respect to the geometry of the adsorbed complexes. An anomaly is observed in the spectra of the surface-adsorbed monolayer of [Fe(salten)(pyS)](+), which suggests that the salten ligand is partially decoordinated from the Fe(III) center and one of its phenolate arms binds to the Au(111) surface. For complex [Fe(thiotolylsalten)(NCS)] that is bound to the Au(111) surface via a thiolate-functionalized salten ligand, this anomaly is not observed, which indicates that the coordination sphere of the complex in the bulk is retained on the surface. The implications of these results with respect to the preparation of surface-adsorbed monolayers of functional transition-metal complexes are discussed.
Collapse
Affiliation(s)
- Hanne Jacob
- Institut für Anorganische Chemie, Christian-Albrechts-Universität Kiel, Max-Eyth-Strasse 2, 24118 Kiel, Germany
| | | | | | | | | | | | | |
Collapse
|
162
|
Golecki M, Lach J, Jeremies A, Lungwitz F, Fronk M, Salvan G, Zahn DRT, Park J, Krupskaya Y, Kataev V, Klingeler R, Büchner B, Mahns B, Knupfer M, Siles PF, Grimm D, Schmidt OG, Reis A, Thiel WR, Breite D, Abel B, Kersting B. Chemisorption of exchange-coupled [Ni2L(dppba)]+ complexes on gold by using ambidentate 4-(diphenylphosphino)benzoate co-ligands. Chemistry 2013; 19:7787-801. [PMID: 23595564 DOI: 10.1002/chem.201300496] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Indexed: 11/09/2022]
Abstract
A new strategy for the fixation of redox-active dinickel(II) complexes with high-spin ground states to gold surfaces was developed. The dinickel(II) complex [Ni2L(Cl)]ClO4 (1ClO4), in which L(2-) represents a 24-membered macrocyclic hexaaza-dithiophenolate ligand, reacts with ambidentate 4-(diphenylphosphino)benzoate (dppba) to form the carboxylato-bridged complex [Ni2L(dppba)](+), which can be isolated as an air-stable perchlorate [Ni2L(dppba)]ClO4 (2ClO4) or tetraphenylborate [Ni2L(dppba)]BPh4 (2BPh4) salt. The auration of 2ClO4 was probed on a molecular level, by reaction with AuCl, which leads to the monoaurated Ni(II)2Au(I) complex [Ni(II)2L(dppba)Au(I)Cl]ClO4 (3ClO4). Metathesis of 3ClO4 with NaBPh4 produces [Ni(II)2L(dppba)Au(I)Ph]BPh4 (4BPh4), in which the Cl(-) is replaced by a Ph(-) group. The complexes were fully characterized by ESI mass spectrometry, IR and UV/Vis spectroscopy, X-ray crystallography (2BPh4 and 4BPh4), cyclic voltammetry, SQUID magnetometry and HF-ESR spectroscopy. Temperature-dependent magnetic susceptibility measurements reveal a ferromagnetic coupling J = +15.9 and +17.9 cm(-1) between the two Ni(II) ions in 2ClO4 and 4BPh4 (H = -2 JS1S2). HF-ESR measurements yield a negative axial magnetic anisotropy (D<0), which implies a bistable (easy axis) magnetic ground state. The binding of the [Ni2L(dppba)]ClO4 complex to gold was ascertained by four complementary surface analytical methods: contact angle measurements, atomic-force microscopy, X-ray photoelectron spectroscopy, and spectroscopic ellipsometry. The results indicate that the complexes are attached to the Au surface through coordinative Au-P bonds in a monolayer.
Collapse
Affiliation(s)
- Matthias Golecki
- Institut für Anorganische Chemie, Universität Leipzig, 04103 Leipzig, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
163
|
Cremades E, Pemmaraju CD, Sanvito S, Ruiz E. Spin-polarized transport through single-molecule magnet Mn6 complexes. NANOSCALE 2013; 5:4751-4757. [PMID: 23599124 DOI: 10.1039/c3nr00054k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The coherent transport properties of a device, constructed by sandwiching a Mn6 single-molecule magnet between two gold surfaces, are studied theoretically by using the non-equilibrium Green's function approach combined with density functional theory. Two spin states of such Mn6 complexes are explored, namely the ferromagnetically coupled configuration of the six Mn(III) cations, leading to the S = 12 ground state, and the low S = 4 spin state. For voltages up to 1 volt the S = 12 ground state shows a current one order of magnitude larger than that of the S = 4 state. Furthermore this is almost completely spin-polarized, since the Mn6 frontier molecular orbitals for S = 12 belong to the same spin manifold. As such the high-anisotropy Mn6 molecule appears as a promising candidate for implementing, at the single molecular level, both spin-switches and low-temperature spin-valves.
Collapse
Affiliation(s)
- Eduard Cremades
- Departament de Química Inorgànica and Centre de Recerca en Química Teòrica, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
| | | | | | | |
Collapse
|
164
|
Warner B, Oberg JC, Gill TG, El Hallak F, Hirjibehedin CF, Serri M, Heutz S, Arrio MA, Sainctavit P, Mannini M, Poneti G, Sessoli R, Rosa P. Temperature- and Light-Induced Spin Crossover Observed by X-ray Spectroscopy on Isolated Fe(II) Complexes on Gold. J Phys Chem Lett 2013; 4:1546-1552. [PMID: 26282313 DOI: 10.1021/jz4005619] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Using X-ray absorption techniques, we show that temperature- and light-induced spin crossover properties are conserved for a submonolayer of the [Fe(H2B(pz)2)2(2,2'-bipy)] complex evaporated onto a Au(111) surface. For a significant fraction of the molecules, we see changes in the absorption at the L2,3 edges that are consistent with those observed in bulk and thick film references. Assignment of these changes to spin crossover is further supported by multiplet calculations to simulate the X-ray absorption spectra. As others have observed in experiments on monolayer coverages, we find that many molecules in our submonolayer system remain pinned in one of the two spin states. Our results clearly demonstrate that temperature- and light-induced spin crossover is possible for isolated molecules on surfaces but that interactions with the surface may play a key role in determining when this can occur.
Collapse
Affiliation(s)
| | | | | | | | | | - Michele Serri
- #Department of Materials and London Centre for Nanotechnology, Imperial College London, London, United Kingdom
| | - Sandrine Heutz
- #Department of Materials and London Centre for Nanotechnology, Imperial College London, London, United Kingdom
| | - Marie-Anne Arrio
- ¶Institut de Minéralogie et de Physique des Milieux Condensés, UMR7590, Université Pierre et Marie Curie, Paris, France
| | - Philippe Sainctavit
- ¶Institut de Minéralogie et de Physique des Milieux Condensés, UMR7590, Université Pierre et Marie Curie, Paris, France
| | | | - Giordano Poneti
- ∇Department of Applied Sciences and Technology, Guglielmo Marconi University, Rome, Italy
| | | | - Patrick Rosa
- ∥CNRS, Univ. Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France
| |
Collapse
|
165
|
Pronschinske A, Chen Y, Lewis GF, Shultz DA, Calzolari A, Nardelli MB, Dougherty DB. Modification of molecular spin crossover in ultrathin films. NANO LETTERS 2013; 13:1429-1434. [PMID: 23517023 DOI: 10.1021/nl304304e] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Scanning tunneling microscopy and local conductance mapping show spin-state coexistence in bilayer films of Fe[(H2Bpz2)2bpy] on Au(111) that is independent of temperature between 131 and 300 K. This modification of bulk behavior is attributed in part to the unique packing constraints of the bilayer film that promote deviations from bulk behavior. The local density of states measured for different spin states shows that high-spin molecules have a smaller transport gap than low-spin molecules and are in agreement with density functional theory calculations.
Collapse
Affiliation(s)
- Alex Pronschinske
- Department of Physics, North Carolina State University, Raleigh, North Carolina 27695, United States
| | | | | | | | | | | | | |
Collapse
|
166
|
Gütlich P, Gaspar AB, Garcia Y. Spin state switching in iron coordination compounds. Beilstein J Org Chem 2013; 9:342-91. [PMID: 23504535 PMCID: PMC3596041 DOI: 10.3762/bjoc.9.39] [Citation(s) in RCA: 486] [Impact Index Per Article: 44.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 01/18/2013] [Indexed: 11/29/2022] Open
Abstract
The article deals with coordination compounds of iron(II) that may exhibit thermally induced spin transition, known as spin crossover, depending on the nature of the coordinating ligand sphere. Spin transition in such compounds also occurs under pressure and irradiation with light. The spin states involved have different magnetic and optical properties suitable for their detection and characterization. Spin crossover compounds, though known for more than eight decades, have become most attractive in recent years and are extensively studied by chemists and physicists. The switching properties make such materials potential candidates for practical applications in thermal and pressure sensors as well as optical devices. The article begins with a brief description of the principle of molecular spin state switching using simple concepts of ligand field theory. Conditions to be fulfilled in order to observe spin crossover will be explained and general remarks regarding the chemical nature that is important for the occurrence of spin crossover will be made. A subsequent section describes the molecular consequences of spin crossover and the variety of physical techniques usually applied for their characterization. The effects of light irradiation (LIESST) and application of pressure are subjects of two separate sections. The major part of this account concentrates on selected spin crossover compounds of iron(II), with particular emphasis on the chemical and physical influences on the spin crossover behavior. The vast variety of compounds exhibiting this fascinating switching phenomenon encompasses mono-, oligo- and polynuclear iron(II) complexes and cages, polymeric 1D, 2D and 3D systems, nanomaterials, and polyfunctional materials that combine spin crossover with another physical or chemical property.
Collapse
Affiliation(s)
- Philipp Gütlich
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg-Universität, Staudingerweg 9, 55099 Mainz, Germany
| | - Ana B Gaspar
- Institut de Ciència Molecular (ICMOL)/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, 46071 València, Spain
| | - Yann Garcia
- Institute of Condensed Matter and Nanosciences, MOST – Inorganic Chemistry, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain la Neuve, Belgium
| |
Collapse
|
167
|
Uhlmann C, Swart I, Repp J. Controlling the orbital sequence in individual Cu-phthalocyanine molecules. NANO LETTERS 2013; 13:777-80. [PMID: 23356959 DOI: 10.1021/nl304483h] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We report on the controlled change of the energetic ordering of molecular orbitals. Negatively charged copper(II)phthalocyanine on NaCl/Cu(100) undergoes a Jahn-Teller distortion that lifts the degeneracy of two frontier orbitals. The energetic order of the levels can be controlled by Au and Ag atoms in the vicinity of the molecule. As only one of the states is occupied, the control of the energetic order is accompanied by bistable changes of the charge distribution inside the molecule, rendering it a bistable switch.
Collapse
Affiliation(s)
- C Uhlmann
- Institute of Experimental and Applied Physics, University of Regensburg, 93053 Regensburg, Germany
| | | | | |
Collapse
|
168
|
Pronschinske A, Bruce RC, Lewis G, Chen Y, Calzolari A, Buongiorno-Nardelli M, Shultz DA, You W, Dougherty DB. Iron(ii) spin crossover films on Au(111): scanning probe microscopy and photoelectron spectroscopy. Chem Commun (Camb) 2013; 49:10446-52. [DOI: 10.1039/c3cc44904a] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
169
|
Ellingsworth EC, Turner B, Szulczewski G. Thermal conversion of [Fe(phen)3](SCN)2 thin films into the spin crossover complex Fe(phen)2(NCS)2. RSC Adv 2013. [DOI: 10.1039/c3ra22534h] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
170
|
|
171
|
Shepherd HJ, Molnár G, Nicolazzi W, Salmon L, Bousseksou A. Spin Crossover at the Nanometre Scale. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201201205] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
172
|
Sheu C, Chen S, Lee G, Liu Y, Wen Y, Lee J, Chuang Y, Wang Y. Structure and Magnetism of the Iron(III) Spin‐Crossover Complex [Fe
III
{
N
‐ethyl‐
N
‐(2‐aminoethyl)salicylaldiminate}
2
]ClO
4. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201201067] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Chou‐Fu Sheu
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, Fax: +886‐2‐23638377, http://www.ntu.edu.tw/
| | - Szu‐Miao Chen
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, Fax: +886‐2‐23638377, http://www.ntu.edu.tw/
| | - Gene‐Hsiang Lee
- Instrumentation Center, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Yi‐Hung Liu
- Instrumentation Center, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Yuh‐Sheng Wen
- Institute of Chemistry, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 11529, Taiwan
| | - Jey‐Jau Lee
- National Synchrotron Radiation Research Center, Hsin Chu, Taiwan
| | - Yu‐Chun Chuang
- National Synchrotron Radiation Research Center, Hsin Chu, Taiwan
| | - Yu Wang
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, Fax: +886‐2‐23638377, http://www.ntu.edu.tw/
| |
Collapse
|
173
|
Bernien M, Wiedemann D, Hermanns CF, Krüger A, Rolf D, Kroener W, Müller P, Grohmann A, Kuch W. Spin Crossover in a Vacuum-Deposited Submonolayer of a Molecular Iron(II) Complex. J Phys Chem Lett 2012; 3:3431-3434. [PMID: 26290968 DOI: 10.1021/jz3011805] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Spin-state switching of transition-metal complexes (spin crossover) is sensitive to a variety of tiny perturbations. It is often found to be suppressed for molecules directly adsorbed on solid surfaces. We present X-ray absorption spectroscopy measurements of a submonolayer of [Fe(II)(NCS)2L] (L: 1-{6-[1,1-di(pyridin-2-yl)ethyl]-pyridin-2-yl}-N,N-dimethylmethanamine) deposited on a highly oriented pyrolytic graphite substrate in ultrahigh vacuum. These molecules undergo a thermally induced, fully reversible, gradual spin crossover with a transition temperature of T1/2 = 235(6) K and a transition width of ΔT80 = 115(8) K. Our results show that by using a carbon-based substrate the spin-crossover behavior can be preserved even for molecules that are in direct contact with a solid surface.
Collapse
Affiliation(s)
- Matthias Bernien
- †Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Dennis Wiedemann
- ‡Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 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
| | - Daniela Rolf
- †Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Wolfgang Kroener
- §Department of Physics, Universität Erlangen-Nürnberg, Erwin-Rommel-Straße 1, 91058 Erlangen, Germany
| | - Paul Müller
- §Department of Physics, Universität Erlangen-Nürnberg, Erwin-Rommel-Straße 1, 91058 Erlangen, Germany
| | - Andreas Grohmann
- ‡Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
| | - Wolfgang Kuch
- †Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| |
Collapse
|
174
|
Craig GA, Costa JS, Roubeau O, Teat SJ, Aromí G. An FeIISpin-Crossover Complex Becomes Increasingly Cooperative with Ageing. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201201041] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
175
|
Robust spin crossover and memristance across a single molecule. Nat Commun 2012; 3:938. [PMID: 22760637 DOI: 10.1038/ncomms1940] [Citation(s) in RCA: 288] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Accepted: 05/31/2012] [Indexed: 11/08/2022] Open
Abstract
A nanoscale molecular switch can be used to store information in a single molecule. Although the switching process can be detected electrically in the form of a change in the molecule's conductance, adding spin functionality to molecular switches is a key concept for realizing molecular spintronic devices. Here we show that iron-based spin-crossover molecules can be individually and reproducibly switched between a combined high-spin, high-conduction state and a low-spin, low-conduction state, provided the individual molecule is decoupled from a metallic substrate by a thin insulating layer. These results represent a step to achieving combined spin and conduction switching functionality on the level of individual molecules.
Collapse
|