Single-Source Precursors For Synthesizing Bifunctional Periodic Mesoporous Organosilicas


  • G.A.O. is Government of Canada Research Chair in Materials Chemistry and appreciates the financial support from the Natural Sciences and Engineering Research Council (NSERC) of Canada. W.J.H. acknowledges the financial support from NSERC for a PDF scholarship. We thank Srebri Petrov (PXRD), Neil Coombs, and Marc Mamak (SEM/TEM) for their assistance.


A new class of bifunctional periodic mesoporous organosilicas (PMOs) composed of organosilicate building blocks with two different silicon sites have been synthesized from the single-source bifunctional organosilica precursors tris(triethoxysilylethyl)ethoxysilane and bis(triethoxysilylethyl)diethoxysilane, respectively denoted MT3-PMO and DT2-PMO. The synthesis of these PMOs is achieved by the co-assembly of a triblock-copolymer Pluronic P123 template with the bifunctional organosilica precursor under acid-catalyzed and inorganic-salt-assisted conditions. After template removal through solvent extraction, the MT3-PMO and DT2-PMO so obtained show well-ordered mesopores and display large pore diameters (6–7 nm) and pore volumes (0.6–0.8 cm3 g–1) with a narrow pore-size distribution and high surface areas (700–800 m3 g–1).