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Cryptands amphiphiles

Unsymmetrical derivatization of a cryptand can afford yet another class of compounds known as gemini-amphiphiles (193) as shown in Scheme 9. However, vesicles from these surfactant molecules are not stable for more than 1 h at 298 K. [Pg.311]

The coreceptor molecules discussed above are built on polar binding subunits. Within the general class of cryptand molecules, the combination of polar binding subunits with more or less rigid, apolar shaping components provides new types of hollow, amphiphilic macropolycyclic coreceptors, termed speleands, which form speleates by substrate inclusion [4, 23]. [Pg.180]

Amphiphilic macrocyclic host molecules have been investigated for many years. Among others, it is known that amphiphilic crown ethers, " cryptands, calixarenes, cyclodextrins, and curcubitnrils can form bilayer vesicles in aqueous solution. However, the host-guest chemistry of such host vesicles remained largely unexplored for many years. Darcy and Ravoo prepared bilayer vesicles composed entirely of amphiphilic cyclodextrin host molecules. These vesicles have a membrane that displays a high density of embedded host molecules that bind hydrophobic guest molecules such as f-butylbenzyl and adamantane derivatives. The characteristic size-selective inclusion behavior of the cyclodextrins is maintained, even when the host molecules are embedded in a hydrophobic... [Pg.511]


See other pages where Cryptands amphiphiles is mentioned: [Pg.688]    [Pg.334]    [Pg.452]    [Pg.4]    [Pg.435]    [Pg.122]    [Pg.252]    [Pg.304]    [Pg.304]    [Pg.305]    [Pg.305]    [Pg.309]    [Pg.311]    [Pg.313]    [Pg.316]    [Pg.319]    [Pg.265]    [Pg.1116]    [Pg.365]    [Pg.106]    [Pg.131]   
See also in sourсe #XX -- [ Pg.304 , Pg.305 , Pg.306 , Pg.307 , Pg.308 , Pg.309 , Pg.310 , Pg.311 , Pg.312 , Pg.313 , Pg.314 , Pg.315 , Pg.316 , Pg.317 , Pg.318 ]




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Cryptands 2.1.1 [cryptand

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