152985 20251017144552.0 doi 10.1039/c9tc04710g sideral 116393 ART-2020-116393 eng Escorihuela, Enrique Universidad de Zaragoza (orcid)0000-0001-6189-1642 Towards the design of effective multipodal contacts for use in the construction of Langmuir-Blodgett films and molecular junctions 2020 Access copy available to the general public Unrestricted As part of on-going efforts to optimize the electrical performance and stability of molecular electronic components, anchor groups that bind molecules to electrode surfaces via multiple points of connection (multipodal contacts) have begun to attract attention. Here an oligo(arylene)ethynylene (OAE) derivative with ''tripodal'' 2, 6-bis((methylthio)methyl)pyridine anchoring groups at both molecular termini has been prepared and used to form well-ordered monolayer Langmuir films at the air-water interface. These films were transferred onto solid supports (surface pressure of transference 8 mN m(-1)) to give homogeneous, densely packed, monolayer Langmuir-Blodgett (LB) films, which efficiently block a gold electrode surface. Within the surface-supported LB film, the molecules are oriented with a tilt angle of approximately 30 degrees to the surface normal and contacted through both the ''buttressed'' methylthioether groups and the pyridine nitrogen atom, as determined by X-ray photoelectron spectroscopy (XPS) and shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS). Molecular junctions formed by contact of a single molecule within the film by the "STM touch-to-contact" method give a most probable molecular conductance of 4.4 x 10(-5)G(0). This value compares well with the single molecule conductance of 1, 4-bis(pyridin-4-ylethynyl)benzene determined by a variety of methods (3.2-5.4 x 10(-5)G(0)), indicating that the addition of the buttressing groups does not perturb the favourable electrical characteristics of the pyridyl contacting group. Consistent with these conductance data, a transition voltage (V-trans = 0.48 V) was observed for this ''buttressed'', pyridine-contacted OAE derivative, indicating relatively good alignment of the metal electrode Fermi level and the frontier molecular orbitals. info:eu-repo/grantAgreement/ES/DGA/E31-17R PLATON info:eu-repo/grantAgreement/ES/MINECO-FEDER/MAT2016-78257-R info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 7.393 2020 PHYSICS, APPLIED 25 / 160 = 0.156 2020 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 65 / 333 = 0.195 2020 Q1 T1 1.899 2020 Materials Chemistry 2020 Q1 Chemistry (miscellaneous) 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Cea, Pilar Universidad de Zaragoza (orcid)0000-0002-4729-9578 Bock, Sören Milan, David C. Naghibi, Saman Osorio, Henry M. Nichols, Richard J. Low, Paul J. Martín, Santiago Universidad de Zaragoza (orcid)0000-0001-9193-3874 2012 755 Universidad de Zaragoza Dpto. Química Física Área Química Física 8, 2 (2020), 672-682 J. mater. chem. C JOURNAL OF MATERIALS CHEMISTRY C 2050-7526 3357976 http://zaguan.unizar.es/record/152985/files/texto_completo.pdf Versión publicada 2742523 http://zaguan.unizar.es/record/152985/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:152985 articulos driver 2025-10-17-14:12:00 ARTICLE