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A Ruthenium( II )‐Complexed Rotaxane Whose Ring Incorporates a 6,6′‐Diphenyl‐2,2′‐bipyridine: Synthesis and Light‐Driven Motions
Author(s) -
Collin JeanPaul,
Jouvenot Damien,
Koizumi Masatoshi,
Sauvage JeanPierre
Publication year - 2005
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200401008
Subject(s) - rotaxane , chemistry , ruthenium , ring (chemistry) , bipyridine , dumbbell , stereochemistry , catenane , yield (engineering) , crystallography , supramolecular chemistry , molecule , catalysis , organic chemistry , crystal structure , materials science , metallurgy , medicine , physical therapy
By incorporating a 6,6'‐diphenyl‐2,2'‐bipyridine (dpbipy) fragment in a ring, endo coordination of a ruthenium( II ) center is performed selectively and almost quantitatively. The threaded system, containing a helical fragment, could be fully characterized. When the terminal functions of the rod‐shaped helical complex threaded through the macrocycle are phenol groups, the complete rotaxane is prepared by the classical Williamson stoppering reaction in moderate yield. Light‐induced motions of the unstoppered system (pseudorotaxane) and the real rotaxane have been studied. Under visible light irradiation, quantitative decoordination of the dpbipy‐containing ring is observed, leading to the separate fragments (ring and helical thread) or to a new rotaxane (uncoordinated ring threaded by the dumbbell). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)