title: Single-step dispersion of functionalities on a silica surface.
abstract: A new process for coating a mesoporous silica gel with a mixture of the grafting reagents para-aminophenyltrimethoxysilane and phenyltrimethoxysilane is thoroughly analyzed. The dilution of para-aminophenylsilane with phenylsilane at different ratios allows the density of the functional amino groups present on the silica surface to be controlled, while keeping constant the overall number of grafts. Furthermore, the choice of a rigid linker prevents undesirable interactions between the active function and the inorganic support that could alter the function reactivity. This simple and new method, which results in the improvement of the dispersion of a functionality in a one-pot synthesis, could be particularly interesting in the field of supported catalysis and molecular recognition. The dispersion of the functional groups of the synthesized hybrid solids is investigated using a pyrene derivative covalently linked to the free amino groups of the para-aminophenylsilanes by analyzing the excimer and monomer fluorescence properties of the probe.
authors.affiliation: Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-UM2-ENSCM-UM1, Matériaux Avancés pour la Catalyse et la Santé, ENSCM, 8 rue de l'Ecole Normale, 34296 Montpellier cedex 5, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Banet
authors.forename: Nathalie
authors.initials: N
authors.lastname: Marcotte
authors.forename: Dan A
authors.initials: DA
authors.lastname: Lerner
authors.forename: Daniel
authors.initials: D
authors.lastname: Brunel
mesh_terms: D000588:Amines / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D015394:Molecular Structure; D012822:Silicon Dioxide / Q000737:chemistry*; D013053:Spectrophotometry; D013499:Surface Properties
chemical_list: D000588:Amines; D005456:Fluorescent Dyes; D012822:Silicon Dioxide