Direct synthesis of periodic mesoporous organosilicas: Functional incorporation by co-condensation with organosilanes

Mesoscopic organosilicas were synthesized with bis(triethoxysilyl)ethane (B TSE) and cetyltrimethylammonium chloride (CTAC) under basic conditions. Fur ther functionalization was achieved by co-condensation with trialkoxyorgano silanes. Surfactant extraction produced periodic mesoporous organosilicas ( PMO's) functionalized with the respective organosilane pendent groups. Orga nosilanes used in this study include: 3-amino-propyltrimethoxysilane, n-(2- aminoethyl)-3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane , 2-(trimethoxysilylethyl)pyridine, n-(3-triethoxysilylpropyl)-4,5-dihydroi midazole, phenethyltrimethoxysilane, and benzyltriethoxysilane. These mater ials have been characterized by nitrogen gas adsorption, powder X-ray diffr action (XRD), diffuse reflectance infrared Fourier transform spectroscopy ( DRIFTS), elemental analysis (EA), and high-resolution thermogravimetric ana lysis (TGA). The effect of organosilane incorporation on the porous structu re of these materials is examined.