Shape-Controlled Bridged Silsesquioxanes: Hollow Tubes and Spheres
作者:Joël J. E. Moreau、Luc Vellutini、Michel Wong Chi Man、Catherine Bied
DOI:10.1002/chem.200390183
日期:2003.4.4
A new approach for the morphological control of bridgedsilsesquioxanes has been achieved by the hydrolysis of silylated organic molecules bearing urea groups. The urea groups are responsible for the auto-association of the molecules through intermolecular hydrogen-bonding interactions. The self-assembly leads to supramolecular architectures that have the ability to direct the organization of hybrid
A chiral periodic mesoporous organosilica (ChiMO) was prepared, in which a 1,2-bis-(ureido)cyclohexyl linker (38 wt %) is introduced into the walls of the hybrid organic−inorganic material. This silica was used as a host for 11-formyl-12-methyldibenzobarrelene (2), and the stereoselectivity of the di-π-methanerearrangement of 2 within this host−guest complex was studied. At low conversions, the only
New Hybrid Organic−Inorganic Solids with Helical Morphology via H-Bond Mediated Sol−Gel Hydrolysis of Silyl Derivatives of Chiral (<i>R</i>,<i>R</i>)- or (<i>S</i>,<i>S</i>)-Diureidocyclohexane
作者:Joël J. E. Moreau、Luc Vellutini、Michel Wong Chi Man、Catherine Bied