1. Institut des Sciences Chimiques de Rennes UMR 6226, Institut de Physique de Rennes, UMR 6251 CNRS Université de Rennes 1 Campus de Beaulieu 35042 Rennes Cedex France
2. Faculty of Chemistry Jagiellonian University 30-060 Krakow Poland
3. Dipartimento di Chimica e Chimica Industriale University of Pisa via Moruzzi 13 56124 Pisa Italy
4. Present address: Université de Genève Département de Chimie Organique Quai Ernest-Ansermet 30 1211 Genève 4 Switzerland
5. Aix Marseille University, CNRS, Centrale Marseille, iSm2 Marseille France
6. Department of Chemistry University of Durham Durham DH1 3LE UK
7. Department of Chemistry University at Buffalo, State University of New York Buffalo NY 14260 USA