title: Controlled molecular motions in copper-complexed rotaxanes: an XAS study.
abstract: The environment of the central metal of a molecular machine-like copper rotaxane was observed by XAS experiments. The wheel of the rotaxane is a hetero-bischelating macrocycle containing both bidentate (phenanthroline) and terdentate (terpyridine) moieties. The axle of the assembly contains only a bidentate moiety. Applying an external chemical stimulus-oxidation of the metal-increases the number of coordinating atoms required by the metal template from 4 to 5. This variation is consistent with the oscillation of the wheel around the axle, leading thus to the most stable environment for the metal in the Cu(II) rotaxane.
authors.affiliation: Laboratoire de Chimie Organo-Minérale, UMR 7513 du CNRS, Faculté de Chimie, Université Louis Pasteur, 4 rue Blaise Pascal, 67070 Strasbourg, France.
authors.forename: J M
authors.initials: JM
authors.lastname: Kern
authors.forename: L
authors.initials: L
authors.lastname: Raehm
authors.forename: J P
authors.initials: JP
authors.lastname: Sauvage
authors.forename: B
authors.initials: B
authors.lastname: Divisia-Blohorn
authors.forename: P L
authors.initials: PL
authors.lastname: Vidal