Chemically induced contraction and stretching of a linear rotaxane dimer

Chemistry : a European Journal
Maria Consuelo Jimenez-MoleroJean-Pierre Sauvage

Abstract

Copper(I)-induced assembly of two self-complementary identical units, which consist of a ring that incorporates a 1,10-phenanthroline group attached to a small filament containing a second 1,10-phenanthroline (phen) group, leads quantitatively to a doubly threaded complex. Each copper(I) center is four-coordinate and is located inside a ring and bound to a phen from the macrocyle. The two other coordination sites are occupied by a phen from the filament connected to the other ring. An X-ray structure of the dicopper(I) complex unambiguously demonstrates the doubly threaded nature of the system. The molecule has C(2) symmetry in the crystal. This is an extended form with a Cu small middle dot small middle dot small middle dotCu separation of 18.3 A and an overall length close to 40 A. Further synthetic work, which utilizes the two terminal phenolic functions of the previous dicopper(I) complex, gives rise to a more complex system in which both filaments have been prolonged in opposite directions by 2,2':6',2"-terpyridine (terpy) motifs and bulky stoppers. The organic backbone is that of a rotaxane dimer. Although redox cycling of Cu(I) to Cu(II) did not lead to intramolecular rearrangement, simple chemical reactions induced larg...Continue Reading

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