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• W1978654857 abstract "This study investigates the effect of substitution with different functional groups and of molecular flexibility by changing within the axle from a single C–C bond to a double C=C bond. Therefore, we present static quantum chemical calculations at the dispersion-corrected density functional level (DFT-D3) for several Leigh-type rotaxanes. The calculated crystal structure is in close agreement with the experimental X-ray data. Compared to a stiffer axle, a more flexible one results in a stronger binding by 1–3 kcal/mol. Alterations of the binding energy in the range of 5 kcal/mol could be achieved by substitution with different functional groups. The hydrogen bond geometry between the isophtalic unit and the carbonyl oxygen atoms of the axle exhibited distances in the range of 2.1 to 2.4 Å for six contact points, which shows that not solely but to a large amount the circumstances in the investigated rotaxanes are governed by hydrogen bonding. Moreover, the complex with the more flexible axle is usually more unsymmetrical than the one with the stiff axle. The opposite is observed for the experimentally investigated axle with the four phenyl stoppers. Furthermore, we considered an implicit continuum solvation model and found that the complex binding is weakened by approximately 10 kcal/mol, and hydrogen bonds are slightly shortened (by up to 0.2 Å)." @default.
• W1978654857 created "2016-06-24" @default.
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• W1978654857 date "2014-06-05" @default.
• W1978654857 modified "2023-10-14" @default.
• W1978654857 title "Substitution effect and effect of axle’s flexibility at (pseudo-)rotaxanes" @default.
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• W1978654857 doi "https://doi.org/10.3762/bjoc.10.131" @default.
• W1978654857 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4077404" @default.
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