Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 14, Issue 19, Pages 5803-5811Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200800257
Keywords
crown compounds; molecular devices; rotaxanes; supramolecular chemistry
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We have designed and synthesized rotaxanes whose rates of rocking motion (pendular motion) were switched reversibly through changes to the size of the ring component in response to external stimuli. The ring molecules of the rotaxanes incorporate a metaphenylene unit, which swings like a pendulum, and a dianthrylethane unit, which undergoes reversible isomerization in response to photo- and thermal stimuli and changes the size of the ring component. The rocking rates were estimated quantitatively by variable-temperature (VT) NMR spectroscopy and saturation transfer experiments, which revealed substantial changes in the rates between the open and closed forms, particularly in the case of rotaxanes with an isopropoxy group attached to a phenylene unit.
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