1. King's College, University of London; Department of Chemistry; The Strand London UK WC2R 2LS
2. University of Strathclyde; Department of Pure and Applied Chemistry; 295 Cathedral Street Glasgow, Scotland U.K. G1 1XL
3. LURE, Centre Universitaire Paris-Sud; Bâtiment 205D Orsay-Cedex France F-91405