From Cyclodextrin Assemblies to Porous Materials by Silica Templating We thank the Max-Planck society for funding.

Abstract

Self‐organization in aqueous media studied indirectly: The aqueous phase is solidified by a silica sol–gel process, and the supramolecular aggregate is 1:1 cast into a solid silica matrix. For the model‐system cyclodextrins it was shown that the cyclodextrin molecules self‐assemble into “wormlike” aggregates in the porous silica (see scheme). By using this template, porous materials were obtained with promising properties such as a uniform pore system and smooth walls.

Porous materials via nanocasting procedures: innovative materials and learning about soft-matter organization

“…84 Cyclodextrins are cyclic sugars containing 6 (a-), 7 (b-), or 8 (g-CD) glucose units 1,4-cyclically connected to a 'molecular barrel'. It is known from the literature 85 that these 'barrels' have an exterior which is covered by OH-groups while the interior cavity is quite hydrophopic, characterized by CH 2 groups.…”

Cyclodextrin-modified MCM-41 for selective double bond migration

“…The CDs compound has a truncated cone shape. It has been reported that cyclodextrins can act as templates for the production of porous silica materials with pore size closely corresponding with the cyclodextrin diameters (1.5-2 nm) and bicontinuous ''worm-type'' pore structures using a nanocasting concept [12]. On the other hand, MCM-41 having a 3-to 10-nm-sized pore with a hexagonal crystalline pore structure has been reported.…”

Formation and Function of Nano- and Microstructures by the Self-assembly of Cyclic Oligosaccharides ‘Cyclodextrins’

“…It is believed that these fiber assemblies were formed by assembling CD molecules in a channel fashion. The driving force for the formation of these self-assemblies can be ascribed to hydrogen bonding interactions between the hydroxyl groups of the CDs (26,(30)(31)(32)(33). The formation of these assemblies was inhibited by chemical modification of the hydroxyl groups of the CDs, the addition of hydrogen-bond-disrupting agents such as urea, and the ionization of the CD hydroxyl groups by increasing the pH of the solutions to above pH 12.…”