1. Istituto
per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche, Via P. Gobetti 101, 40129 Bologna, Italy
2. Laboratory
of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
3. Instituto
de Ciencia Molecular, Universidad de Valencia, 46980 Paterna, Spain
4. School
of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.