Abstract
(Figure Presented) Going 'round the twist: Single crystals of a ferrocenyl-substituted pseudorotaxane have different structures at 30 and 128°C owing to a thermal crystalline phase transition. This change in crystal structure results from a conformational change that involves rotation of the aromatic ring of the axle component (see scheme), and cooperative unidirectional rotation of the molecules alters the optical anisotropy of the crystal. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.