Synthesis of bifunctionalized-pore mesoporous organosilica. Study of the accessibility and the distribution of functions in the pore channels

Abstract

In this paper, we report the synthesis in one step of ordered (hexagonal phase) mesoporous silicas functionalized with two different organic groups [HS(CH₂)₃– and acac(CH₂)₃–] located in the pore channels. These materials were characterized by X-ray diffraction measurements, transmission electron spectroscopy, nitrogen adsorption analyses and solid state ¹³C and ²⁹Si NMR spectroscopies. The bifunctionalization of the internal pore’s surface by the organic groups was clearly evidenced by elemental analyses and chemical reactivity. In addition, we have shown that the organic groups were regularly distributed on the pore’s surface.