[1] Univ Salerno, Dipartimento Chim, I-84081 Baronissi, Italy
[2] Univ Freiburg, Inst Makromol Chem, D-79104 Freiburg, Germany
[3] Univ Freiburg, Freiburger Mat Forschungszentrum, D-79104 Freiburg, Germany
[4] Johannes Gutenberg Univ Mainz, Inst Anorgan Chem & Analyt Chem, D-55099 Mainz, Germany