An acid-base switchable [2]rotaxane.
A chemically addressable, bistable [2]rotaxane, which incorporates a dumbbell-shaped component containing both secondary dialkylammonium and 1,2-bis(pyridinium)ethane recognition sites for its ring component, dibenzo[24]crown-8 (DB24C8), has been assembled. (1)H NMR spectroscopy has demonstrated that deprotonation (and reprotonation) of the secondary dialkylammonium (dialkylamine) recognition site induces the DB24C8 ring to move away from this site to the 1,2-bis(pyridinium)ethane one (and back again) in a discrete manner, particularly when the experiment is performed in CDCl(3) solution.
Elizarov
Arkadij M
AM
Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, USA.
Chiu
Sheng-Hsien
SH
Stoddart
J Fraser
JF