Browsing by Subject "Shuttle"
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PublicationRestrictedFiles folders for the fair data of the published article Modulating the shuttling motion of [2]rotaxanes built of p-xylylenediamine units through permethylation at the benzylic positions of the ring(2023-10-04) Puigcerver, Julio; Alajarín, Mateo; Berna, José; Martínez Cuezva, Alberto; Química Orgánica- PublicationOpen AccessModulating the shuttling motion of [2]rotaxanes built of p-xylylenediamine units through permethylation at the benzylic positions of the ring(Royal Society of Chemistry, 2023-11-03) Puigcerver, Julio; Alajarín, Mateo; Berna, José; Martínez Cuezva, Alberto; Química OrgánicaIn this study, we show the effect of the gem-dimethyl substitution at the four benzylic carbons of the ring on the internal dynamics of two-station [2]rotaxanes. Such structural modification of the polyamide macrocycles promotes a drastic change of the internal dynamics as shown by variable-temperature (VT) 1H NMR experiments. We determined that the shuttling rates of the octamethylated macrocycle along a series of symmetrical threads were significantly faster compared to the non-substituted ring. This effect was particulary pronounced in the -based system, in which the rate was 27 times faster than that of the model system.