[1] Univ Lyon, CNRS 5182, Ecole Normale Super Lyon, Chim Lab, F-69364 Lyon 07, France
[2] Univ Grenoble 1, CNRS 5588, Spectrometrie Phys Lab, F-38402 St Martin Dheres, France
[3] Univ Grenoble 1, CNRS 5250, ICMG, FR 2607,Dept Chim Mol, F-38402 St Martin Dheres, France
[4] Ctr Expertise Parisien, F-94114 Arcueil, France
[5] Ecole Normale Super, CNRS, UMR 8531, Lab Photophys & Photochim Supramol & Macromol, F-94235 Cachan, France