[1] Univ Pavia, Dept Phys Chem, I-27100 Pavia, Italy
[2] IENI CNR, I-27100 Pavia, Italy
[3] Warsaw Univ Technol, Fac Chem, PL-00664 Warsaw, Poland
[4] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland
[5] Politecn Torino, Dept Mat Sci & Chem Engn, I-10129 Turin, Italy