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Peter Smet coauthored research on silsesquioxane.^[ref]

A silicon–oxygen framework with ideal fully condensed composition $(\mathrm{RSi}{\mathrm{O}}_{3/2}{)}_{\mathrm{n}}$. Each silicon has one organic substituent and three siloxane bridges. Incompletely condensed cages retain silanol groups.

A coordination ligand containing deprotonated silanol oxygen, $\mathrm{Si}-{\mathrm{O}}^{-}$, which binds a metal through oxygen. Three silanol groups on a corner-deficient silsesquioxane can give a facial tridentate trianionic donor set.