New insights into the interaction of triethylphosphine oxide with silica surface: exchange between different surface species

Pires, Elisabet (Universidad de Zaragoza) ; Fraile, José M.

Resumen: 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.

Idioma: Inglés

DOI: 10.1039/d2cp01621d

Año: 2022

Publicado en: Physical chemistry chemical physics 24 (2022), 16755–16761
ISSN: 1463-9076

Factor impacto JCR: 3.3 (2022)

Categ. JCR: PHYSICS, ATOMIC, MOLECULAR & CHEMICAL rank: 9 / 35 = 0.257 (2022) - Q2 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 88 / 161 = 0.547 (2022) - Q3 - T2

Factor impacto CITESCORE: 5.9 - Chemistry (Q2) - Physics and Astronomy (Q1)

Factor impacto SCIMAGO: 0.824 - Physics and Astronomy (miscellaneous) (Q1) - Physical and Theoretical Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-ERDF/E37-20R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/RTI2018-093431-B-100

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Orgánica (Dpto. Química Orgánica)