[1] Univ Cagliari, Dipartimento Sci Chim & Geol, SS 554 Bivio Per Sestu, I-09042 Monserrato, CA, Italy
[2] Adam Mickiewicz Univ, Fac Chem, Umultowska 89b, PL-61614 Poznan, Poland
[3] Univ Burgos, Fac Ciencias, Dept Quim, Burgos 09001, Spain
[4] Univ Cagliari, Dipartimento Fis, SS 554 Bivio Per Sestu, I-09042 Monserrato, CA, Italy