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• W2078447930 endingPage "5098" @default.
• W2078447930 startingPage "5092" @default.
• W2078447930 abstract "Ab initio calculations together with vibrational circular dichroism (VCD) have been used for studying the conformations of a quinoline-derived oligoamide bearing a terminal chiral residue. Three helically folded conformers of the dimer, trimer, and tetramer forms of the oligomer were optimized at the density functional theory (DFT) level using the B3LYP functional and the 6-31G* basis set. For each form, the three conformers differ in their helical handedness and in the conformation of the chiral end group. The calculated structures of the tetramer and also the proportions predicted between them based on their calculated Gibbs free energies differences match remarkably well with experimental data collected on an octamer. Specifically, a R-phenethyl terminal group gives rise to a 91:9 ratio between left handed and right handed helices. The predicted VCD spectrum calculated from the Boltzmann population of the individual conformer reproduces very well the experimental VCD spectrum of the tetramer in CDCl3 solution. The DFT calculations performed for the trimer also allow one to assess the preferred handedness of the helix and the conformation of the chiral end group, but the calculated relative populations differ slightly from experimental data. Finally, this study shows that the dimer fragment is not sufficient to obtain valuable information on the conformation of this aromatic oligoamide foldamer." @default.
• W2078447930 created "2016-06-24" @default.
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• W2078447930 date "2007-05-17" @default.
• W2078447930 modified "2023-10-16" @default.
• W2078447930 title "Density Functional Theory Calculations and Vibrational Circular Dichroism of Aromatic Foldamers" @default.
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• W2078447930 doi "https://doi.org/10.1021/jp071645p" @default.
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• W2078447930 hasPublicationYear "2007" @default.
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