Inclusion compounds (ICs) were obtained for the first time from a semifluorinated n-alkane (F(CF2)8(CH2)16H, abbreviated F8H16) with β-cyclodextrin (β-CD) in water. Because of the hydrophobic nature of
the two constituent blocks, the semifluorinated alkane readily penetrates the hydrophobic CD's cavity,
to avoid contact with water, and produces a fine crystalline powder. The crystalline ICs were studied
through differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray diffractometry,
and atomic force microscopy, and they were identified as novel systems, with different structure and
behavior from the two parent molecules. According to X-ray diffractometry, the host−guest system presents
the channel type structure that is typical of polymer−CD inclusion compounds. Atomic force microscopy
confirms the presence of tubular structures obtained from dispersion of the F8H16/β-CD inclusion compound.
The formation of such supramolecular assemblies may be useful for the encapsulation of fluorinated
hydrophobic materials and for the insertion of specific polymeric chains onto the surface of cyclodextrin-grafted fibers and textiles.
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