147986 20250110163828.0 doi 10.1039/c9nr05662a sideral 114002 ART-2019-114002 eng Herrer, L. Universidad de Zaragoza (orcid)0000-0002-3576-5156 Single molecule vs. large area design of molecular electronic devices incorporating an efficient 2-aminepyridine double anchoring group 2019 When a molecule is bound to external electrodes by terminal anchor groups, the latter are of paramount importance in determining the electrical conductance of the resulting molecular junction. Here we explore the electrical properties of a molecule with bidentate anchor groups, namely 4, 4'-(1, 4-phenylenebis(ethyne-2, 1-diyl))bis(pyridin-2-amine), in both large area devices and at the single molecule level. We find an electrical conductance of 0.6 × 10-4G0 and 1.2 × 10-4G0 for the monolayer and for the single molecule, respectively. These values are approximately one order of magnitude higher than those reported for monodentate materials having the same molecular skeleton. A combination of theory and experiments is employed to understand the conductance of monolayer and single molecule electrical junctions featuring this new multidentate anchor group. Our results demonstrate that the molecule has a tilt angle of 30° with respect to the normal to the surface in the monolayer, while the break-off length in the single molecule junction occurs for molecules having a tilt angle estimated as 40°, which would account for the difference in their conductance values per molecule. The bidentate 2-aminepyridine anchor is of general interest as a contact group, since this terminal functionalized aromatic ring favours binding of the adsorbate to the metal contact resulting in enhanced conductance values. © 2019 The Royal Society of Chemistry. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/DGA/E31-17R info:eu-repo/grantAgreement/ES/DGA/E47-17R info:eu-repo/grantAgreement/EC/FP7/607602/EU/Hierarchical Self Assembly of Polymeric Soft Systems/SASSYPOL info:eu-repo/grantAgreement/EC/H2020/767187/EU/Quantum Interference Enhanced Thermoelectricity/QuIET This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 767187-QuIET info:eu-repo/grantAgreement/ES/MINECO/CTQ2015-70174-P info:eu-repo/grantAgreement/ES/MINECO/MAT2016-78257-R info:eu-repo/grantAgreement/ES/MINECO/PGC2018-097583-B-I00 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 6.895 2019 MATERIALS SCIENCE, MULTIDISCIPLINARY 50 / 314 = 0.159 2019 Q1 T1 NANOSCIENCE & NANOTECHNOLOGY 25 / 103 = 0.243 2019 Q1 T1 CHEMISTRY, MULTIDISCIPLINARY 28 / 176 = 0.159 2019 Q1 T1 PHYSICS, APPLIED 23 / 154 = 0.149 2019 Q1 T1 2.18 2019 Nanoscience and Nanotechnology 2019 Q1 Materials Science (miscellaneous) 2019 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Ismae, l A. Martín, S. Universidad de Zaragoza (orcid)0000-0001-9193-3874 Milan, D.C. Serrano, J.L. Universidad de Zaragoza (orcid)0000-0001-9866-6633 Nichols, R.J. Lambert, C. Cea, P. Universidad de Zaragoza (orcid)0000-0002-4729-9578 2013 765 Universidad de Zaragoza Dpto. Química Orgánica Área Química Orgánica 2012 755 Universidad de Zaragoza Dpto. Química Física Área Química Física 11, 34 (2019), 15871-15880 Nanoscale Nanoscale 2040-3364 1730939 http://zaguan.unizar.es/record/147986/files/texto_completo.pdf Versión publicada 2783100 http://zaguan.unizar.es/record/147986/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:147986 articulos driver 2025-01-10-14:24:32 ARTICLE