title: Axle length does not affect switching dynamics in degenerate molecular shuttles with rigid spacers.
abstract: For a series of [2]rotaxane molecular shuttles possessing linear rigid rod-like axles of varying lengths between degenerate recognition sites, the activation barrier for shuttling motion was clearly shown to be constant. Moreover, dynamic NMR studies have revealed that both the entropic and enthalpic contributions to the shuttling motion remain constant regardless of the actual length of the rigid rod-like axles employed herein.
authors.affiliation: Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University , 1-3 Machikaneyama, Toyonaka 560-8531, Japan.
authors.forename: Philip G
authors.initials: PG
authors.lastname: Young
authors.forename: Keiji
authors.initials: K
authors.lastname: Hirose
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Tobe