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FTIR hydroxyl vibration bands in highly dealuminated zeolites could be unambiguously assigned to well defined hydroxyl clusters present at defect sites by the use of density functional calculations on incompletely condensed silasesquioxane complexes which, in addition, provided useful spectroscopic references.

The heterogenization of a titanium(IV) silsesquioxane complex in an MCM-41 molecular sieve, by tailoring the polarity of MCM-41, results in self-assembled materials (see the space-filling model on the right) that are active, truly heterogeneous, and recyclable catalysts for liquid-phase alkene epoxidation.

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