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Mesoporous bridged silsesquioxanes

Figure 3.9 Co-condensation method (direct synthesis) employing TEOS and a terminal organotrialk-oxysilane (top) or TEOS and an organo-bridged silsesquioxane (bottom) as mixed precursors for the organic modification of mesoporous pure silica phases. R = organic functional group. Figure 3.9 Co-condensation method (direct synthesis) employing TEOS and a terminal organotrialk-oxysilane (top) or TEOS and an organo-bridged silsesquioxane (bottom) as mixed precursors for the organic modification of mesoporous pure silica phases. R = organic functional group.
Mesoporous organosilicates are synthesized using similar self-assembly approaches as pure silica meso-phases the main difference being the silicon-containing precursors that consist of bridged silsesquioxanes, (RO)3Si-R -Si(OR)3. Different types of amphiphile molecules, including cationic (alkyltrimethylammonium),... [Pg.857]

The sulfonic acid-functionalized PMO was successfully synthesized by the biphenyl-bridged precursor [(EtO)3Si-CgH4-Si(OEt)3j and 3-mercaptopropyl-trimethoxysilane [MPTMS (MeO)3Si-CH2CH2CH2SHj in the presence of a cationic surfactant [74]. Vanadium-containing ethane-siHca hybrid mesoporous silsesquioxane materials (V-HMM) with uniform hexagonal arrangement were prepared by Shylesh and Singh [75]. [Pg.98]

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Silsesquioxane

Silsesquioxanes

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