149855 20251017144606.0 doi 10.1039/d0tc05658h sideral 124330 ART-2021-124330 eng Herrer, L. Universidad de Zaragoza (orcid)0000-0002-3576-5156 pH control of conductance in a pyrazolyl Langmuir-Blodgett monolayer 2021 Access copy available to the general public Unrestricted In this contribution, pyrazole is identified as an excellent anchoring group capable of forming well-ordered Langmuir-Blodgett (LB) monolayers onto gold substrates. In contrast, the formation of self-assembled (SA) monolayers is prevented due to the extraction of gold atoms from the surface upon the incubation process required for the formation of these films. The electronic coupling strength of pyrazole-gold junctions is explored through evaluation of the electrical properties of LB films incorporating a double pyrazole terminated molecular wire, namely 1, 4-bis(1H-pyrazol-4-ylethynyl)benzene, 1; these electrical properties are compared with those of molecules having a similar chemical structure, geometry and length. The conductance value for LB films of1is high when the monolayer is transferred from a Langmuir film prepared onto a basic subphase, 1.19 × 10-4G0, as it is more than four times larger than the conductance of the same compound incorporated on a LB film prepared from a water subphase, 0.27 × 10-4G0. These results are interpreted in terms of the deprotonation of the pyrazole group in a basic media that leads to the formation of the pyrazolate (deprotonated pyrazole) moiety. This results in a more efficient electronic coupling with the gold tip of the scanning tunnelling microscope used for film characterization. info:eu-repo/grantAgreement/ES/DGA/E31-20R info:eu-repo/grantAgreement/ES/DGA/LMP33-18 info:eu-repo/grantAgreement/ES/MICINN/MAT2016-78257-R info:eu-repo/grantAgreement/ES/MICINN/PID2019-105881RB-I00 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 8.067 2021 PHYSICS, APPLIED 24 / 161 = 0.149 2021 Q1 T1 MATERIALS SCIENCE, MULTIDISCIPLINARY 71 / 344 = 0.206 2021 Q1 T1 1.608 2021 Materials Chemistry 2021 Q1 Chemistry (miscellaneous) 2021 Q1 11.8 2021 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Martín, S. Universidad de Zaragoza (orcid)0000-0001-9193-3874 González-Orive, A. Milan, D.C. Vezzoli, A. Nichols, R.J. Serrano, J.L. Universidad de Zaragoza (orcid)0000-0001-9866-6633 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 9, 8 (2021), 2882-2889 J. mater. chem. C JOURNAL OF MATERIALS CHEMISTRY C 2050-7526 562316 http://zaguan.unizar.es/record/149855/files/texto_completo.pdf Postprint 643217 http://zaguan.unizar.es/record/149855/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:149855 articulos driver 2025-10-17-14:15:33 ARTICLE