title: Hybrid materials and periodic mesoporous organosilicas containing covalently bonded organic anion and cation featuring MCM-41 and SBA-15 structure.
abstract: We report the synthesis of a new trialkoxysilylated ionic liquid based on disilylated guanidinium and monosilylated sulfonimide species. This compound allowed the successful preparation of new periodic mesoporous organosilicas containing covalently anchored ion-pair through both organo-cationic and organo-anionic moieties which have never been reported up to now. Two classes of hybrid materials containing guanidinium-sulfonimide ion-pairs (IPs) have been synthesized. The first type of material was prepared by grafting the silylated IP onto both MCM-41-type and SBA-15-type silicas according to a surface sol-gel polymerization. The second class was synthesized following a one-pot sol-gel procedure using silylated IP and tetraethoxysilane as framework precursors. These latter materials correspond to so-called periodic mesoporous organosilicas (PMOs) and gave "organo-ionically" modified MCM-41 and SBA-15 related solids. The materials were characterized by a series of techniques including XRD, nitrogen sorption, solid-state NMR, FTIR, transmission electronic microscopy, and elemental analysis. The highest structural regularity in terms of pore size distribution and channel size homogeneity was observed for IP-PMOs possessing SBA-15-type architecture due to an enhanced trialkoxysilylated IP precursor/surfactant interaction. Solvatochromic experiments with Reichardt's dye showed good accessibility of the silica-supported ion-pair and suggested the formation of monophasic materials.
authors.affiliation: Laboratoire MACS, Institut Charles Gerhardt de Montpellier, UMR 5253-CNRS-UM2-ENSCM-UM1, Ecole Nationale Superieure de Chimie, 8, rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France.
authors.forename: Abdelkrim
authors.initials: A
authors.lastname: El Kadib
authors.forename: Peter
authors.initials: P
authors.lastname: Hesemann
authors.forename: Karine
authors.initials: K
authors.lastname: Molvinger
authors.forename: Jérôme
authors.initials: J
authors.lastname: Brandner
authors.forename: Christine
authors.initials: C
authors.lastname: Biolley
authors.forename: Philippe
authors.initials: P
authors.lastname: Gaveau
authors.forename: Joël J E
authors.initials: JJ
authors.lastname: Moreau
authors.forename: Daniel
authors.initials: D
authors.lastname: Brunel