Synthesis and characterization of multifunctional periodic mesoporous organosilica from diureidophenylene bridged organosilica precursor

This paper reports the periodic mesoporous organosilicas (PMOs) functionalised with newly synthesized bis-silylated (1,1(1,4-phenylene (bis-3-(3-triethoxysilylpropyl)urea)(BSBDA)) organosilica with 1,2-bis(triethoxysilyl) ethane (BTSE) using a co-condensation process. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), nitrogen adsorption-desorption, NMR (proton, 13C and 29Si) spectra, and MALDI-TOF were used to characterise and evaluate the structural properties. The results showed that BSBDA is linked covalently to the mesochannel of the PMO frameworks. The pore size and overall structural properties in the functionalized PMOs were found to depend on the loading amounts of BSBDA. The overall results suggested that the highly functionalised PMOs could be tuned even at high BSBDA loadings (25 wt%). Copyright © 2012 American Scientific Publishers. All rights reserved