An Acid–Base-Controllable [c2]Daisy Chain (pages 7470–7474)
Jishan Wu, Ken Cham-Fai Leung, Diego Benítez, Ja-Young Han, Stuart J. Cantrill, Lei Fang and J. Fraser Stoddart
Version of Record online: 26 AUG 2008 | DOI: 10.1002/anie.200803036
The long and the short of it: A bistable molecular muscle, based on a doubly threaded Janus-type rotaxane, is assembled using a template-directed self-assembly process. Under the influence of changes in the pH value, the two identical matching components glide along one another through terminal crown ether moieties, bringing about expansion and contraction of the molecule.