1. University of Strasbourg, CNRS, ISIS UMR 7006; 8 allée Gaspard Monge 67000 Strasbourg France
2. University of Florence; Dipartimento di Chimica “Ugo Schiff”; Via della Lastruccia 3-13 50019 Sesto Fiorentino Italy
3. ISOF, CNR; Via P. Gobetti 101 40129 Bologna Italy