1. CEISAM; UMR CNRS 6230, BP 92208; 2 Rue de la Houssinière 44322 Nantes, Cedex 3 France
2. Department of Chemistry; Faculty of Natural Sciences; Matej Bel University, Tajovského 40; 97400 Banská Bystrica Slovak Republic
3. Institut Universitaire de France; 1 rue Descartes 75231 Paris Cedex 05 France