1. Institute of Polymers, Composites and Biomaterials, National Research Council (IPCB-CNR), Mostra d’Oltremare pad.20—Viale J.F. Kennedy 54, 80125 Naples, Italy
2. Institute of Chemistry of Organometallic Compounds, National Research Council (ICCOM-CNR), via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy