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Hyre AS, Doerrer LH. A structural and spectroscopic overview of molecular lanthanide complexes with fluorinated O-donor ligands. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2019.213098] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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2
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Benjalal Y, Bonvoisin J, Bouju X. Unraveling the molecular conformations of a single ruthenium complex adsorbed on the Ag(111) surface by calculations. Phys Chem Chem Phys 2019; 21:10022-10027. [PMID: 31041976 DOI: 10.1039/c9cp01244c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tris(dibenzoylmethanato)ruthenium (Ru(dbm)3) molecule has recently been characterized by scanning tunneling microscopy (STM) experiments upon adsorption on Ag(111). The adsorbed Ru(dbm)3 molecule shows two conformations with respect to the [11[combining macron]0] direction of the substrate, one with a three-lobed feature and the other one with a bi-lobed structure. For each of these structures, the molecule can take two geometries (states). Molecular mechanics calculations in a semi-empirical framework and STM calculated images reveal that these states on the substrate originate from the enantiomer of the Ru(dbm)3 molecule in the case of three-lobed structure and from the rotation of the two phenyls in the top dbm moities for the bi-lobed form.
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Affiliation(s)
- Youness Benjalal
- Université Sultan Moulay Slimane, Faculté polydisciplinaire, Département de chimie, Béni Mellal, Morocco.
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3
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Jeremias L, Novotný J, Repisky M, Komorovsky S, Marek R. Interplay of Through-Bond Hyperfine and Substituent Effects on the NMR Chemical Shifts in Ru(III) Complexes. Inorg Chem 2018; 57:8748-8759. [PMID: 30004686 DOI: 10.1021/acs.inorgchem.8b00073] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The links between the molecular structure and nuclear magnetic resonance (NMR) parameters of paramagnetic transition-metal complexes are still relatively unexplored. This applies particularly to the contact term of the hyperfine contribution to the NMR chemical shift. We report combining experimental NMR with relativistic density functional theory (DFT) to study a series of Ru(III) complexes with 2-substituted β-diketones. A series of complexes with systematically varied substituents was synthesized and analyzed using 1H and 13C NMR spectroscopy. The NMR spectra recorded at several temperatures were used to construct Curie plots and estimate the temperature-independent (orbital) and temperature-dependent (hyperfine) contributions to the NMR shift. Relativistic DFT calculations of electron paramagnetic resonance and NMR parameters were performed to interpret the experimental observations. The effects of individual factors such as basis set, density functional, exact-exchange admixture, and relativity are analyzed and discussed. Based on the calibration study in this work, the fully relativistic Dirac-Kohn-Sham (DKS) method, the GIAO approach (orbital shift), the PBE0 functional with the triple-ζ valence basis sets, and the polarizable continuum model for describing solvent effects were selected to calculate the NMR parameters. The hyperfine contribution to the total paramagnetic NMR (pNMR) chemical shift is shown to be governed by the Fermi-contact (FC) term, and the substituent effect (H vs Br) on the through-bond FC shifts is analyzed, interpreted, and discussed in terms of spin-density distribution, atomic spin populations, and molecular-orbital theory. In contrast to the closed-shell systems of Rh(III), the presence of a single unpaired electron in the open-shell Ru(III) analogs significantly alters the NMR resonances of the ligand atoms distant from the metal center in synergy with the substituent effect.
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Affiliation(s)
- Lukáš Jeremias
- CEITEC-Central European Institute of Technology , Masaryk University , Kamenice 5/A4 , CZ-625 00 Brno , Czechia
| | - Jan Novotný
- CEITEC-Central European Institute of Technology , Masaryk University , Kamenice 5/A4 , CZ-625 00 Brno , Czechia
| | - Michal Repisky
- Hylleraas Centre for Quantum Molecular Science, Department of Chemistry , UiT-The Arctic University of Norway , N-9037 Tromsø , Norway
| | - Stanislav Komorovsky
- Institute of Inorganic Chemistry , Slovak Academy of Sciences , Dúbravská cesta 9 , SK-84536 Bratislava , Slovakia
| | - Radek Marek
- CEITEC-Central European Institute of Technology , Masaryk University , Kamenice 5/A4 , CZ-625 00 Brno , Czechia
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Cortijo M, Viala C, Reynaldo T, Favereau L, Fabing I, Srebro-Hooper M, Autschbach J, Ratel-Ramond N, Crassous J, Bonvoisin J. Synthesis, Spectroelectrochemical Behavior, and Chiroptical Switching of Tris(β-diketonato) Complexes of Ruthenium(III), Chromium(III), and Cobalt(III). Inorg Chem 2017; 56:4556-4568. [DOI: 10.1021/acs.inorgchem.6b03094] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Miguel Cortijo
- CEMES, CNRS UPR 8011, Université de Toulouse, 29 Rue Jeanne Marvig, BP 94347, 31055 Toulouse Cedex 4, France
| | - Christine Viala
- CEMES, CNRS UPR 8011, Université de Toulouse, 29 Rue Jeanne Marvig, BP 94347, 31055 Toulouse Cedex 4, France
| | - Thibault Reynaldo
- Sciences
Chimiques de Rennes, UMR 6226, CNRS-Université de Rennes 1, Campus de
Beaulieu, 35042 Rennes Cedex, France
| | - Ludovic Favereau
- Sciences
Chimiques de Rennes, UMR 6226, CNRS-Université de Rennes 1, Campus de
Beaulieu, 35042 Rennes Cedex, France
| | - Isabelle Fabing
- UMR CNRS 5068, LSPCMIB, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 9, France
| | - Monika Srebro-Hooper
- Faculty
of Chemistry, Jagiellonian University, R. Ingardena 3, 30-060 Krakow, Poland
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States
| | - Nicolas Ratel-Ramond
- CEMES, CNRS UPR 8011, Université de Toulouse, 29 Rue Jeanne Marvig, BP 94347, 31055 Toulouse Cedex 4, France
| | - Jeanne Crassous
- Sciences
Chimiques de Rennes, UMR 6226, CNRS-Université de Rennes 1, Campus de
Beaulieu, 35042 Rennes Cedex, France
| | - Jacques Bonvoisin
- CEMES, CNRS UPR 8011, Université de Toulouse, 29 Rue Jeanne Marvig, BP 94347, 31055 Toulouse Cedex 4, France
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Kiefl E, Mannini M, Bernot K, Yi X, Amato A, Leviant T, Magnani A, Prokscha T, Suter A, Sessoli R, Salman Z. Robust Magnetic Properties of a Sublimable Single-Molecule Magnet. ACS NANO 2016; 10:5663-5669. [PMID: 27139335 DOI: 10.1021/acsnano.6b01817] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The organization of single-molecule magnets (SMMs) on surfaces via thermal sublimation is a prerequisite for the development of future devices for spintronics exploiting the richness of properties offered by these magnetic molecules. However, a change in the SMM properties due to the interaction with specific surfaces is usually observed. Here we present a rare example of an SMM system that can be thermally sublimated on gold surfaces while maintaining its intact chemical structure and magnetic properties. Muon spin relaxation and ac susceptibility measurements are used to demonstrate that, unlike other SMMs, the magnetic properties of this system in thin films are very similar to those in the bulk, throughout the full volume of the film, including regions near the metal and vacuum interfaces. These results exhibit the robustness of chemical and magnetic properties of this complex and provide important clues for the development of nanostructures based on SMMs.
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Affiliation(s)
- Evan Kiefl
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Matteo Mannini
- Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU Firenze , Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Kevin Bernot
- INSA, ISCR, UMR 6226, F-35708 RENNES , 20 Avenue des Buttes de Coësmes CS70839, 35708 Rennes Cedex, France
| | - Xiaohui Yi
- INSA, ISCR, UMR 6226, F-35708 RENNES , 20 Avenue des Buttes de Coësmes CS70839, 35708 Rennes Cedex, France
| | - Alex Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Tom Leviant
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
- Department of Physics, Technion - Israel Institute of Technology , Haifa 32000, Israel
| | - Agnese Magnani
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena & INSTM RU Siena , Via A. Moro, 2 53100 Siena, Italy
| | - Thomas Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Andreas Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
| | - Roberta Sessoli
- Department of Chemistry "Ugo Schiff", University of Florence & INSTM RU Firenze , Via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Zaher Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland
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Yu W, Schramm F, Pineda EM, Lan Y, Fuhr O, Chen J, Isshiki H, Wernsdorfer W, Wulfhekel W, Ruben M. Single-molecule magnet behavior in 2,2'-bipyrimidine-bridged dilanthanide complexes. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:126-37. [PMID: 26925361 PMCID: PMC4734418 DOI: 10.3762/bjnano.7.15] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 01/08/2016] [Indexed: 06/05/2023]
Abstract
A series of 2,2'-bipyrimidine-bridged dinuclear lanthanide complexes with the general formula [Ln(tmhd)3]2bpm (tmhd = 2,2,6,6-tetramethyl-3,5-heptanedionate, bpm = 2,2'-bipyrimidine, Ln = Gd(III), 1; Tb(III), 2; Dy(III), 3; Ho(III), 4 and Er(III), 5) has been synthesized and characterized. Sublimation of [Tb(tmhd)3]2bpm onto a Au(111) surface leads to the formation of a homogeneous film with hexagonal pattern, which was studied by scanning tunneling microscopy (STM). The bulk magnetic properties of all complexes have been studied comprehensively. The dynamic magnetic behavior of the Dy(III) and Er(III) compounds clearly exhibits single molecule magnet (SMM) characteristics with an energy barrier of 97 and 25 K, respectively. Moreover, micro-SQUID measurements on single crystals confirm their SMM behavior with the presence of hysteresis loops.
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Affiliation(s)
- Wen Yu
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Frank Schramm
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Eufemio Moreno Pineda
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Yanhua Lan
- Université Grenoble Alpes / CNRS, Institut NEEL, 25 rue des Martyrs, F-38000 Grenoble, France
| | - Olaf Fuhr
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Jinjie Chen
- Physikalisches Institut (PI), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany
| | - Hironari Isshiki
- Physikalisches Institut (PI), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany
| | - Wolfgang Wernsdorfer
- Université Grenoble Alpes / CNRS, Institut NEEL, 25 rue des Martyrs, F-38000 Grenoble, France
| | - Wulf Wulfhekel
- Physikalisches Institut (PI), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe, Germany
| | - Mario Ruben
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
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Isshiki H, Chen J, Edelmann K, Wulfhekel W. Sub-monolayer film growth of a volatile lanthanide complex on metallic surfaces. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2015; 6:2412-2416. [PMID: 26733215 PMCID: PMC4685795 DOI: 10.3762/bjnano.6.248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 12/04/2015] [Indexed: 06/05/2023]
Abstract
We deposited a volatile lanthanide complex, tris(2,2,6,6-tetramethyl-3,5-heptanedionato)terbium(III), onto metal surfaces of Cu(111), Ag(111) and Au(111) in vacuum and observed well-ordered sub-monolayer films with low temperature (5 K) scanning tunneling microscopy. The films show a distorted three-fold symmetry with a commensurate structure. Scanning tunneling spectroscopy reveals molecular orbitals delocalized on the ligands of the molecule. Our results imply that this complex can be transferred onto the metal substrates without molecular decomposition or contamination of the surface. This new rare-earth-based class of molecules broadens the choice of molecular magnets to study with scanning tunneling microscopy.
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Affiliation(s)
- Hironari Isshiki
- Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany
| | - Jinjie Chen
- Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany
| | - Kevin Edelmann
- Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany
- Institut for Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Karlsruhe, Germany
| | - Wulf Wulfhekel
- Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe, Germany
- Institut for Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Karlsruhe, Germany
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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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Quardokus RC, Wasio NA, Forrest RP, Lent CS, Corcelli SA, Christie JA, Henderson KW, Kandel SA. Adsorption of diferrocenylacetylene on Au(111) studied by scanning tunneling microscopy. Phys Chem Chem Phys 2013; 15:6973-81. [PMID: 23552908 DOI: 10.1039/c3cp50225b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Scanning tunneling microscopy images of diferrocenylacetylene (DFA) coadsorbed with benzene on Au(111) show individual and close-packed DFA molecules, either adsorbed alongside benzene or on top of a benzene monolayer. Images acquired over a range of positive and negative tip-sample bias voltages show a shift in contrast, with the acetylene linker appearing brighter than the ferrocenes at positive sample bias (where unoccupied states primarily contribute) and the reverse contrast at negative bias. Density functional theory was used to calculate the electronic structure of the gas-phase DFA molecule, and simulated images produced through two-dimensional projections of these calculations approximate the experimental images. The symmetry of both experimental and calculated molecular features for DFA rules out a cis adsorption geometry, and comparison of experiment to simulation indicates torsion around the inter-ferrocene axis between 90° and 180° (trans); the cyclopentadienyl rings are thus angled with respect to the surface.
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Affiliation(s)
- Rebecca C Quardokus
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA
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Bonvoisin J, Ciofini I. Spectral signature of a Ru(ii, iii, iv) complex: a combined experimental and theoretical investigation. Dalton Trans 2013; 42:7943-51. [DOI: 10.1039/c3dt33043e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Schramm A, Stroh C, Dössel K, Lukas M, Fischer M, Schramm F, Fuhr O, Löhneysen HV, Mayor M. Tripodal MIIIComplexes on Au(111) Surfaces: Towards Molecular “Lunar Modules”. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200928] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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