A Photochemically Driven Molecular Machine (pages 1301–1303)
Dr. Roberto Ballardini, Prof. Vincenzo Balzani, Prof. Maria Teresa Gandolfi, Dr. Luca Prodi, Prof. Margherita Venturi, Dr. Douglas Philp, Howard G. Ricketts and Prof. J. Fraser Stoddart
Article first published online: 22 DEC 2003 | DOI: 10.1002/anie.199313011
The unthreading and rethreading of pseudorotaxane 1, which contains two p-phenylene spacers linking two bipyridinium units and a central 1, 5-naphthalenediyl unit, is reversible when an initially oxygen-free solution of 1 in water also containing 9-anthracenecarboxylic acid as a photosensitizes and triethanolamine as a “sacrificial” reluctant is irradiated and then aerated. The absorption and emission spectra of the solution provide conclusive evidence.