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Mulas A, Dubacheva GV, Al Sabea H, Miomandre F, Audibert JF, Norel L, Rigaut S, Lagrost C. Self-Assembled Monolayers of Redox-Active 4d-4f Heterobimetallic Complexes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13711-13717. [PMID: 31550896 DOI: 10.1021/acs.langmuir.9b02083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this work, we report the preparation of functional interfaces incorporating heterobimetallic systems consisting in the association of an electroactive carbon-rich ruthenium organometallic unit and a luminescent lanthanide ion (Ln = Eu3+ and Yb3+). The organometallic systems are functionalized with a terminal hexylthiol group for subsequent gold surface modification. The formation of self-assembled monolayers (SAMs) with these complex molecular architectures are thoroughly demonstrated by employing a combination of different techniques, including infrared reflection absorption spectroscopy, ellipsometry, contact angle, and cyclic voltammetry measurements. The immobilized heterobimetallic systems show fast electron-transfer kinetics and, hence, are capable of fast electrochemical response. In addition, the characteristic electrochemical signals of the SAMs were found to be sensitive to the presence of lanthanide centers at the bipyridyl terminal units. A positive shift of the potential of the redox signal is readily observed for lanthanide complexes compared to the bare organometallic ligand. This effect is equally observed for preformed complexes and on-surface complexation. Thus, an efficient ligating recruitment of europium and ytterbium cations at gold-modified electrodes is demonstrated, allowing for an easy electrochemical detection of the lanthanide ions along with an alternative preparative method of SAMs incorporating lanthanide cations compared to the immobilization of the preformed complex.
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Affiliation(s)
- Andrea Mulas
- UMR CNRS 6226, Institut des Sciences Chimiques de Rennes (ISCR) , Université de Rennes 1 , 35000 Rennes , France
| | - Galina V Dubacheva
- Ecole Normale Supérieure de Cachan, UMR CNRS 8531, Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM) , Université Paris-Saclay , 61 Avenue Président Wilson , 94235 Cachan , France
| | - Hassan Al Sabea
- UMR CNRS 6226, Institut des Sciences Chimiques de Rennes (ISCR) , Université de Rennes 1 , 35000 Rennes , France
| | - Fabien Miomandre
- Ecole Normale Supérieure de Cachan, UMR CNRS 8531, Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM) , Université Paris-Saclay , 61 Avenue Président Wilson , 94235 Cachan , France
| | - Jean-Frédéric Audibert
- Ecole Normale Supérieure de Cachan, UMR CNRS 8531, Photophysique et Photochimie Supramoléculaires et Macromoléculaires (PPSM) , Université Paris-Saclay , 61 Avenue Président Wilson , 94235 Cachan , France
| | - Lucie Norel
- UMR CNRS 6226, Institut des Sciences Chimiques de Rennes (ISCR) , Université de Rennes 1 , 35000 Rennes , France
| | - Stéphane Rigaut
- UMR CNRS 6226, Institut des Sciences Chimiques de Rennes (ISCR) , Université de Rennes 1 , 35000 Rennes , France
| | - Corinne Lagrost
- UMR CNRS 6226, Institut des Sciences Chimiques de Rennes (ISCR) , Université de Rennes 1 , 35000 Rennes , France
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Ruthenium(II) σ-arylacetylide complexes as redox active units for (multi-)functional molecular devices. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.08.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Norel L, Tourbillon C, Warnan J, Audibert JF, Pellegrin Y, Miomandre F, Odobel F, Rigaut S. Redox-driven porphyrin based systems for new luminescent molecular switches. Dalton Trans 2018; 47:8364-8374. [DOI: 10.1039/c8dt01493k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work explores the possibility of controlling the fluorescence of porphyrins via oxidation of a ruthenium acetylide unit. The modulation depends on the nature of the porphyrin unit(s).
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Affiliation(s)
- Lucie Norel
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F-35000 Rennes
- France
| | | | - Julien Warnan
- Université LUNAM
- Université de Nantes
- CNRS
- Chimie et Interdisciplinarité: Synthèse
- Analyse
| | | | - Yann Pellegrin
- Université LUNAM
- Université de Nantes
- CNRS
- Chimie et Interdisciplinarité: Synthèse
- Analyse
| | - Fabien Miomandre
- UMR CNRS 8531-PPSM
- ENS Cachan
- Université Paris-Saclay
- 94235 Cachan
- France
| | - Fabrice Odobel
- Université LUNAM
- Université de Nantes
- CNRS
- Chimie et Interdisciplinarité: Synthèse
- Analyse
| | - Stéphane Rigaut
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F-35000 Rennes
- France
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Di Piazza E, Boilleau C, Vacher A, Merahi K, Norel L, Costuas K, Roisnel T, Choua S, Turek P, Rigaut S. Ruthenium Carbon-Rich Group as a Redox-Switchable Metal Coupling Unit in Linear Trinuclear Complexes. Inorg Chem 2017; 56:14540-14555. [DOI: 10.1021/acs.inorgchem.7b02288] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Emmanuel Di Piazza
- UMR 6226 CNRS-Université de Rennes 1, Institut des Sciences Chimiques de Rennes, Campus de Beaulieu, F-35042 Rennes
Cedex, France
| | - Corentin Boilleau
- UMR 6226 CNRS-Université de Rennes 1, Institut des Sciences Chimiques de Rennes, Campus de Beaulieu, F-35042 Rennes
Cedex, France
| | - Antoine Vacher
- UMR 6226 CNRS-Université de Rennes 1, Institut des Sciences Chimiques de Rennes, Campus de Beaulieu, F-35042 Rennes
Cedex, France
| | - Khalissa Merahi
- UMR 7177 CNRS-Université de Strasbourg, Institut de Chimie, 1
rue Blaise Pascal, BP 296 R8, F-67008 Strasbourg Cedex, France
| | - Lucie Norel
- UMR 6226 CNRS-Université de Rennes 1, Institut des Sciences Chimiques de Rennes, Campus de Beaulieu, F-35042 Rennes
Cedex, France
| | - Karine Costuas
- UMR 6226 CNRS-Université de Rennes 1, Institut des Sciences Chimiques de Rennes, Campus de Beaulieu, F-35042 Rennes
Cedex, France
| | - Thierry Roisnel
- UMR 6226 CNRS-Université de Rennes 1, Institut des Sciences Chimiques de Rennes, Campus de Beaulieu, F-35042 Rennes
Cedex, France
| | - Sylvie Choua
- UMR 7177 CNRS-Université de Strasbourg, Institut de Chimie, 1
rue Blaise Pascal, BP 296 R8, F-67008 Strasbourg Cedex, France
| | - Philippe Turek
- UMR 7177 CNRS-Université de Strasbourg, Institut de Chimie, 1
rue Blaise Pascal, BP 296 R8, F-67008 Strasbourg Cedex, France
| | - Stéphane Rigaut
- UMR 6226 CNRS-Université de Rennes 1, Institut des Sciences Chimiques de Rennes, Campus de Beaulieu, F-35042 Rennes
Cedex, France
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Al-Owaedi OA, Bock S, Milan DC, Oerthel MC, Inkpen MS, Yufit DS, Sobolev AN, Long NJ, Albrecht T, Higgins SJ, Bryce MR, Nichols RJ, Lambert CJ, Low PJ. Insulated molecular wires: inhibiting orthogonal contacts in metal complex based molecular junctions. NANOSCALE 2017; 9:9902-9912. [PMID: 28678257 DOI: 10.1039/c7nr01829k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Metal complexes are receiving increased attention as molecular wires in fundamental studies of the transport properties of metal|molecule|metal junctions. In this context we report the single-molecule conductance of a systematic series of d8 square-planar platinum(ii) trans-bis(alkynyl) complexes with terminal trimethylsilylethynyl (C[triple bond, length as m-dash]CSiMe3) contacting groups, e.g. trans-Pt{C[triple bond, length as m-dash]CC6H4C[triple bond, length as m-dash]CSiMe3}2(PR3)2 (R = Ph or Et), using a combination of scanning tunneling microscopy (STM) experiments in solution and theoretical calculations using density functional theory and non-equilibrium Green's function formalism. The measured conductance values of the complexes (ca. 3-5 × 10-5G0) are commensurate with similarly structured all-organic oligo(phenylene ethynylene) and oligo(yne) compounds. Based on conductance and break-off distance data, we demonstrate that a PPh3 supporting ligand in the platinum complexes can provide an alternative contact point for the STM tip in the molecular junctions, orthogonal to the terminal C[triple bond, length as m-dash]CSiMe3 group. The attachment of hexyloxy side chains to the diethynylbenzene ligands, e.g. trans-Pt{C[triple bond, length as m-dash]CC6H2(Ohex)2C[triple bond, length as m-dash]CSiMe3}2(PPh3)2 (Ohex = OC6H13), hinders contact of the STM tip to the PPh3 groups and effectively insulates the molecule, allowing the conductance through the full length of the backbone to be reliably measured. The use of trialkylphosphine (PEt3), rather than triarylphosphine (PPh3), ancillary ligands at platinum also eliminates these orthogonal contacts. These results have significant implications for the future design of organometallic complexes for studies in molecular junctions.
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Affiliation(s)
- Oday A Al-Owaedi
- Department of Physics, University of Lancaster, Lancaster, LA1 4YB, UK. and Department of Laser Physics, Women Faculty of Science, Babylon University, Hilla, Iraq
| | - Sören Bock
- School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, Perth 6009, Australia
| | - David C Milan
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK
| | | | - Michael S Inkpen
- Department of Chemistry, Imperial College London, London SW7 2AZ, UK
| | - Dmitry S Yufit
- Department of Chemistry, Durham University, South Rd, Durham, DH1 3LE, UK
| | - Alexandre N Sobolev
- School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, Perth 6009, Australia and Centre for Microscopy Characterization and Analysis, University of Western Australia, 35 Stirling Highway, Perth 6009, Australia
| | - Nicholas J Long
- Department of Chemistry, Imperial College London, London SW7 2AZ, UK
| | - Tim Albrecht
- Department of Chemistry, Imperial College London, London SW7 2AZ, UK
| | - Simon J Higgins
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK
| | - Martin R Bryce
- Department of Chemistry, Durham University, South Rd, Durham, DH1 3LE, UK
| | - Richard J Nichols
- Department of Chemistry, University of Liverpool, Crown St, Liverpool, L69 7ZD, UK
| | - Colin J Lambert
- Department of Physics, University of Lancaster, Lancaster, LA1 4YB, UK.
| | - Paul J Low
- School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, Perth 6009, Australia
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Mulas A, He X, Hervault YM, Norel L, Rigaut S, Lagrost C. Dual-Responsive Molecular Switches Based on Dithienylethene-RuII
Organometallics in Self-Assembled Monolayers Operating at Low Voltage. Chemistry 2017; 23:10205-10214. [DOI: 10.1002/chem.201701903] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Indexed: 12/27/2022]
Affiliation(s)
- Andrea Mulas
- Institut des Sciences Chimiques de Rennes, UMR 6226; CNRS-Université de Rennes 1; Campus de Beaulieu 35042 Rennes Cedex France
| | - Xiaoyan He
- Institut des Sciences Chimiques de Rennes, UMR 6226; CNRS-Université de Rennes 1; Campus de Beaulieu 35042 Rennes Cedex France
| | - Yves-Marie Hervault
- Institut des Sciences Chimiques de Rennes, UMR 6226; CNRS-Université de Rennes 1; Campus de Beaulieu 35042 Rennes Cedex France
| | - Lucie Norel
- Institut des Sciences Chimiques de Rennes, UMR 6226; CNRS-Université de Rennes 1; Campus de Beaulieu 35042 Rennes Cedex France
| | - Stéphane Rigaut
- Institut des Sciences Chimiques de Rennes, UMR 6226; CNRS-Université de Rennes 1; Campus de Beaulieu 35042 Rennes Cedex France
| | - Corinne Lagrost
- Institut des Sciences Chimiques de Rennes, UMR 6226; CNRS-Université de Rennes 1; Campus de Beaulieu 35042 Rennes Cedex France
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Chappell S, Brooke C, Nichols RJ, Kershaw Cook LJ, Halcrow M, Ulstrup J, Higgins SJ. Evidence for a hopping mechanism in metal|single molecule|metal junctions involving conjugated metal–terpyridyl complexes; potential-dependent conductances of complexes [M(pyterpy)2]2+ (M = Co and Fe; pyterpy = 4′-(pyridin-4-yl)-2,2′:6′,2′′-terpyridine) in ionic liquid. Faraday Discuss 2016; 193:113-131. [DOI: 10.1039/c6fd00080k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Extensive studies of various families of conjugated molecules in metal|molecule|metal junctions suggest that the mechanism of conductance is usually tunnelling for molecular lengths < ca. 4 nm, and that for longer molecules, coherence is lost as a hopping element becomes more significant. In this work we present evidence that, for a family of conjugated, redox-active metal complexes, hopping may be a significant factor for even the shortest molecule studied (ca. 1 nm between contact atoms). The length dependence of conductance for two series of such complexes which differ essentially in the number of conjugated 1,4-C6H4- rings in the structures has been studied, and it is found that the junction conductances vary linearly with molecular length, consistent with a hopping mechanism, whereas there is significant deviation from linearity in plots of log(conductance) vs. length that would be characteristic of tunnelling, and the slopes of the log(conductance)–length plots are much smaller than expected for an oligophenyl system. Moreover, the conductances of molecular junctions involving the redox–active molecules, [M(pyterpy)2]2+/3+ (M = Co, Fe) have been studied as a function of electrochemical potential in ionic liquid electrolyte, and the conductance–overpotential relationship is found to fit well with the Kuznetsov–Ulstrup relationship, which is essentially a hopping description.
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Affiliation(s)
- Sarah Chappell
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
| | - Carly Brooke
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
| | | | | | | | - Jens Ulstrup
- Department of Chemistry
- Technical University of Denmark
- DK-2800 Kgs. Lyngby
- Denmark
| | - Simon J. Higgins
- Department of Chemistry
- University of Liverpool
- Liverpool L69 7ZD
- UK
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