1. Université Lille Nord de France, UCCS, CNRS UMR 8181, ENSCL-USTL, Villeneuve d’Ascq, France
2. Department of Chemistry, Moscow State University, 119991 Moscow, Russia
3. International Associated Laboratory LEMAC: IEMN, UMR CNRS 8520, PRES Lille Nord de France, EC Lille, Villeneuve d’Ascq, France
4. Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
5. Université Montpellier 2, CNRS, Inst. Ch. Gerhardt, UMR 5253, France