ol5b00530_si_001.pdf (3.49 MB)
Electrostatic Kinetic Barriers in the Threading/Dethreading Motion of a Rotaxane-like Complex
journal contribution
posted on 2015-04-17, 00:00 authored by Anayeli Carrasco-Ruiz, Jorge TiburcioA new rigid cationic
thread, based on the 1,2-bis(bipyridinium)ethane
motif, and a 24-crown-8 anionic macrocycle self-assemble into a pseudo-rotaxane complex in aqueous solution. The presence
of pH-responsive end groups on the thread, remote from the recognition
motif, allows controlling the threading/dethreading rate without perturbing
the complex structure or stability. The difference in the rate is
attributed to the activation or deactivation of electrostatic barriers
on the thread during the sliding process at different pH values.