119009 20240319081023.0 doi 10.1039/d2cp01621d sideral 129663 ART-2022-129663 eng Pires, Elisabet Universidad de Zaragoza (orcid)0000-0002-2676-8814 New insights into the interaction of triethylphosphine oxide with silica surface: exchange between different surface species 2022 Access copy available to the general public Unrestricted Although chemical shift values of triethylphosphine oxide (TEPO) adsorbed on acidic solids have been considered as an indication of acid strength, in this work we demonstrate that the chemical shift depends also on the adsorbed amount of TEPO. On silica, the presence of three different adsorbed species, physisorbed on non-acidic surface, chemisorbed through a single H bond and chemisorbed through two H bonds, can be detected by the correlation of the P-31 chemical shift with the TEPO adsorbed amount. TEPO chemical exchange between the different sites is demonstrated by the single NMR signal obtained in all the cases, and also by the variation of the line width, which is broader at low surface coverage due to the slower chemical exchange because of the longer average distance between surface sites. info:eu-repo/grantAgreement/ES/DGA-ERDF/E37-20R info:eu-repo/grantAgreement/ES/MICINN/RTI2018-093431-B-100 info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 3.3 2022 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL 9 / 35 = 0.257 2022 Q2 T1 CHEMISTRY, PHYSICAL 88 / 161 = 0.547 2022 Q3 T2 0.824 2022 Physics and Astronomy (miscellaneous) 2022 Q1 Physical and Theoretical Chemistry 2022 Q1 5.9 2022 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Fraile, José M. (orcid)0000-0002-0136-5138 2013 765 Universidad de Zaragoza Dpto. Química Orgánica Área Química Orgánica 24 (2022), 16755–16761 Phys. chem. chem. phys. Physical chemistry chemical physics 1463-9076 2233170 http://zaguan.unizar.es/record/119009/files/texto_completo.pdf Versión publicada 2915500 http://zaguan.unizar.es/record/119009/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:119009 articulos driver 2024-03-18-16:27:15 ARTICLE