[1] Univ Trieste, Chem & Pharmaceut Sci Dept, I-34127 Trieste, Italy
[2] INSTM, Unit Trieste, I-34127 Trieste, Italy
[3] Univ Messina, Dipartimento Sci Chim Biol Farmaceut & Ambientali, I-98168 Messina, Italy
[4] INSTM, Unit Messina, I-98168 Messina, Italy
[5] Consiglio Nazl Ric ICCOM CNR, Ist Chim Composti Organometall, I-34127 Trieste, Italy