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dc.contributor.authorOsorio, Henrry M.es_ES
dc.contributor.authorMartín, Santiagoes_ES
dc.contributor.authorMilan, David C.es_ES
dc.contributor.authorGonzález-Orive, Alejandroes_ES
dc.contributor.authorGluyas, Josef B. G.es_ES
dc.contributor.authorHiggins, Simon J.es_ES
dc.contributor.authorLow, Paul J.es_ES
dc.contributor.authorCea, Pilares_ES
dc.identifier.citationJournal of Materials Chemistry C 5(45): 11717-11723 (2017)es_ES
dc.description.abstractSingle-molecule conductance experiments using the STM-based I(s) method and samples of N,N’-di(4-(trimethylsilylethynyl)benzyl)-4,4’-bipyridinium bis(tetrafluoroborate) ([1](BF4)2) prepared on gold substrates with low-surface coverage of [1](BF4)2 (Γ = 1.25·10⁻¹¹ mol·cm⁻²) give rise to molecular junctions with two distinct conductance values. From the associated break-off distances and comparison experiments with related compounds the higher conductance junctions are attributed to molecular contacts between the molecule and the electrodes via the N,N’-dibenzyl-4,4´-bipyridinium (viologen) moiety and one trimethylsilylethynyl (TMSE) group (G = (5.4 ± 0.95)×10⁻⁵ G0, break-off distance (1.56 ± 0.09) nm). The second, lower conductance junction (G = (0.84 ± 0.09)×10⁻⁵ G0) is consistent with an extended molecular conformation between the substrate and tip contacted through the two TMSE groups giving rise to a break-off distance (1.95 ± 0.12) nm that compares well with the Si...Si distance (2.0 nm) in the extended molecule. Langmuir monolayers of [1](BF4)2 formed at the air-water interface can be transferred onto a gold-on-glass substrate by the Langmuir-Blodgett (LB) technique to give well-ordered, compact films with surface coverage Γ = 2.0·10⁻¹⁰ mol·cm⁻². Single-molecule conductance experiments using the STM-based I(s) method reveal only the higher conductance junctions (G = (5.4 ± 0.95)×10⁻⁵ G0, break-off distance (1.56 ± 0.09) nm) due to the restricted range of molecular conformations in the tightly packed, well-ordered LB films.es_ES
dc.description.sponsorshipS.M. and P.C. are grateful for financial assistance from Ministerio de Economía y Competitividad from Spain and fondos FEDER in the framework of projects MAT2016-78257-R. S.M. and P.C. also acknowledge DGA/fondos FEDER (construyendo Europa desde Aragón) for funding the research group Platón (E-54). S.M. acknowledges funding from the University of Zaragoza (grant number JIUZ02016-CIE-04). R.J.N, S.J.G and D.C.M are grateful for financial assistance from the EPSRC (grant EP/M029522/1). P.J.L. and J.B.G.G. gratefully acknowledge support from the Australian Research Council (FT120100073; DP140100855).es_ES
dc.publisherRoyal Society of Chemistry (UK)es_ES
dc.titleInfluence of surface coverage on the formation of 4,4’-bipyridinium (viologen) single molecular junctionses_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderMinisterio de Economía y Competitividad (España)es_ES
dc.contributor.funderEuropean Commissiones_ES
dc.contributor.funderDiputación General de Aragónes_ES
dc.contributor.funderUniversidad de Zaragozaes_ES
dc.contributor.funderEngineering and Physical Sciences Research Council (UK)es_ES
dc.contributor.funderAustralian Research Counciles_ES
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