Alkyl Groups Fold to Fit within a Water-Soluble Cavitand
作者:Kang-Da Zhang、Dariush Ajami、Jesse V. Gavette、Julius Rebek
DOI:10.1021/ja501685z
日期:2014.4.9
widened, deepcavitand host that binds hydrophobic and amphiphilic guests in D2O. Small alkanes (C6 to C11) are bound in compressed conformations and tumble rapidly within the space. Longer n-alkanes (C13 to C14), n-alcohols, and α,ω-diols are taken up in folded conformations. The guests' termini are exposed to solvent while atoms near the alkane's center are buried and protected. The cavitandacts as a
Groups near the upper rim of a cavitand play major roles in the recognition of smallmolecules. Water-soluble deep cavitands bearing the upper rim of imidazole, urea, and methyl urea, were studied regarding their differences in recognition of various guests. H-bonding with water co-ordination between four walls controls the upper-rim opening and binding pattern of amphiphilic molecules.