Elementary supramolecular strings in solutions of chiral trifluoroacetylated amino alcohols
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Elementary supramolecular strings in solutions of chiral trifluoroacetylated amino alcoholsYa. A. LitvinA. N. ShchegolikhinA. A. SkoblinS. V. StovbunStructure of Chemical Compounds, SpectroscopyDOI:
10.Cite this article as: Litvin, Y.A., Shchegolikhin, A.N., Skoblin, A.A. et al. Russ. J. Phys. Chem. B (5. doi:10.
IR spectroscopy is applied to studying the effect of nonpolar and low-polar solvents on the molecular structure of solid-state quasi-one-dimensional strings formed through the chiral self-assembly from solutions of trifluoroacetylated homochiral amino alcohols (TFAAA). It is experimentally confirmed that in stable two-phase string/solvent gels and respective xerogels, solid-phase strings contain no solvent molecules as a structural element, experiencing, however, a weak disturbing influence of solvent molecules. It is shown that the process of spontaneous self-assembly of chiral strings in solutions is accompanied by the formation of a complex system of hydrogen bonds involving the C=O, N–H, and O–H functional groups of dissolved TFAAA molecules and by the displacement of solvent molecules to the periphery of the resulting quasi-one-dimensional strings. The results of the present work, together with data obtained by other experimental methods, indicate that TFAAA-based elementary strings have diameters of 1–2 nm, being crystalline, molecularly thin, quasi-one-dimensional objects. The amplitude of the thermally activated bending vibrations (transverse phonons) of elementary strings is sufficient to cause the entanglement of elementary strings, which leads to the formation of larger diameter supercoiled strings.chiralitysupramolecular structuresIR spectrumhydrogen bondvan der Waals force1.G. Godeau and D. Barthelemy, Langmuir 25, ).2.M. George and R. G. Weiss, Acc. Chem. Res. 39, 489 (2006).3.A. A. Bredikhin, Z. A. Bredikhina, and A. V. Pashagin, Mendeleev Comm. 21, 144 (2011).4.C. Li, N. J. Buurma, I. Haq, C. Turner, and S. P. Armes, Langmuir 21, 1).5.J. Peng, K. Liu, J. Liu, et al., Langmuir 24, ).6.A. Gans?uer, I. Winkler, T. Klawonn, et al., Organometallics 28, ).7.A. R. Hirst, I. A. Coates, T. R. Boucheteau, et al., J. Am. Chem. 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Skoblin1S. V. Stovbun11.Semenov Institute of Chemical PhysicsRussian Academy of SciencesMoscowRussia
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