Pure Appl. Chem., 2003, Vol. 75, No. 8, pp. 1055-1060
doi:10.1351/pac200375081055
Photoinduced dynamics in hydrogen-bonded rotaxanes*
Albert M. Brouwer, Sandro M. Fazio, Céline Frochot, Francesco G. Gatti, David A. Leigh, Jenny K.Y.Wong, and George W. H.Wurpel
1University of Amsterdam, Institute of Molecular Chemistry, Nieuwe Achtergracht 129, 1018 WS Amsterdam, The Netherlands; 2School of Chemistry, University of Edinburgh, The King’s Buildings, West Mains Road, Edinburgh EH9 3JJ, UK
Abstract:
Two classes of rotaxanes are described in which photoinduced processes modulate a large-amplitude motion. In the first type, E–Z-isomerization of a fumaric diamide unit to a maleic diamide leads to a substantial weakening of the hydrogen bonds between the diamide and the macrocyclic ring that surrounds it. As a result, the rate of the pirouetting motion is increased approximately by six orders of magnitude. In the second type, intermolecular photoinduced electron transfer is used to induce a reversible shuttling motion on a time scale of microseconds. Medium effects on the rate of shuttling are presented.
*Lectures presented at the XIXth IUPAC Symposium on Photochemistry, Budapest, Hungary, 1419 July 2002. Other presentations are published in this issue, pp.9991090.
All articles from the XIXth IUPAC Symposium on Photochemistry, Budapest, Hungary, 14–19 July 2002.