title: The surface of ordered mesoporous benzene-silica hybrid material: an infrared and ab initio molecular modeling study.
abstract: Joint IR and computational results allow a detailed characterization of the surface properties of a mesoporous benzene-silica hybrid material with crystal-like wall structure. After outgassing at 450 degrees C, hydroxyl species mainly consist of noninteracting silanols, with both O-H and Si-O stretching modes at lower frequencies than those of SiOH in silica. Interaction with several probe molecules, followed both by experiment and calculus, shows that the aryl group in the coordination sphere of Si imparts a lesser acidity with respect to the isolated silanol in silica. In contrast, adsorption isotherms indicate that the interaction with acetone is stronger with benzene-silica than with silica: this is interpreted in terms of secondary interactions taking place between the slightly acidic CH in acetone and the electronic cloud in benzene-like rings. This suggests that both the inorganic component and the organic one play a role in dictating the surface behavior.
authors.affiliation: Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10138 Torino, Italy.
authors.forename: Barbara
authors.initials: B
authors.lastname: Onida
authors.forename: Luisa
authors.initials: L
authors.lastname: Borello
authors.forename: Claudia
authors.initials: C
authors.lastname: Busco
authors.forename: Piero
authors.initials: P
authors.lastname: Ugliengo
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Goto
authors.forename: Shinji
authors.initials: S
authors.lastname: Inagaki
authors.forename: Edoardo
authors.initials: E
authors.lastname: Garrone