On September 30, 2006, Cieslinski, Marta M.; Steel, Peter J.; Lincoln, Stephen F.; Easton, Christopher J. published an article.SDS of cas: 38939-88-7 The title of the article was Centrosymmetric and non-centrosymmetric packing of aligned molecular fibers in the solid state self assemblies of cyclodextrin-based rotaxanes. And the article contained the following:
Two [2]-rotaxanes each comprising α-cyclodextrin as the rotor, and with either 3,3′-difluoro- or 3,3′-dichloro-stilbene as the axle and trinitro-phenylamino substituents as the blocking groups at the 4- and 4′-positions, were prepared and their structures analyzed in solution and the solid state using H NMR spectroscopy and X-ray crystallog., resp. With each rotaxane, in solution the stilbene rotates freely within the cyclodextrin annulus. In the solid state the 3,3′-dichloro-stilbene-based rotaxane adopts two very similar conformations, each having the chlorine in the anti,anti-orientation. By comparison, the 3,3′-difluoro-stilbene-based rotaxane adopts anti,anti-, anti,syn- and syn,syn-orientations of the substituents. The crystal packing of each rotaxane displays aligned mol. fibers, which are centrosym. oriented in the case of the difluoride due to the head-to-head/tail-to-tail alignment of the cyclodextrins. By contrast, all of the cyclodextrins in the dichloride are aligned head-to-tail along a single axis to give a polar, non-centrosym. crystal. The experimental process involved the reaction of 2-Chloro-4-methyl-1-nitrobenzene(cas: 38939-88-7).SDS of cas: 38939-88-7
The Article related to mol association rotaxane inclusion cyclodextrin crystal structure centrosym, rotaxane cyclodextrin stilbene conformation crystal structure fiber centrosym, Carbohydrates: Oligosaccharides and other aspects.SDS of cas: 38939-88-7
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics