1. Department
of Chemistry, Faculty of Natural Sciences, Matej Bel University, Tajovského 40, SK-97400 Banská Bystrica, Slovak Republic
2. CEISAM,
UMR CNRS 6230, BP 92208, Université de Nantes, 2, rue de
la Houssinière 44322 Nantes Cedex 3, France
3. Institut Universitaire de France, 103, bd Saint-Michel, F-75005 Paris Cedex 05, France