C. Chuit et al., Hybrid organic-inorganic materials. Preparation and properties of dibenzo-18-crown-6 ether-bridged polysilsesquioxanes, CHEM COMMUN, (8), 1999, pp. 723-724
The complexation of alkali metal cations (Na+ and/or K+) by organic-inorgan
ic hybrid materials incorporating dibenzo-18-crown-6 ether moieties covalen
tly linked to silica by two Si-C bonds is explained in terms of deformation
s of the crown ether moiety during the sol-gel process.