| 초록 |
Molecular shuttles based on the rotaxane structure, in which the shuttling process of a ring is controlled by external stimuli, have been widely studied as one type of molecular machines. Herein, three α-Cyclodextrin rotaxanes with different axles lengthes have been prepared, and capped through nucleophilic substitution or electrophilic substitution of 2,4-dinitrofluo-benzene or 9-anthracenemethanol, and fully characterized using FT-IR spectra, 1H NMR spectra, 2D ROESY NMR spectrum, UV/Vis spectrum and Mass spectra. These three rotaxanes were shown to undergo photochemically-induced reversible conversion between the trans- and cis-isomers, causing the Cyclodextrin to move back and forth along the axles, and therefore behave as molecular shuttles. |
