1. Department of Chemistry
and Pharmacy, Inorganic Chemistry, University Erlangen—Nuremberg,
Egerlandstraße 1, D-91058 Erlangen, Germany
2. Université de Toulouse, INSA, UPS, LPCNO, 135 Avenue de Rangueil,
F-31077 Toulouse, France
3. CNRS, LPCNO, F-31077 Toulouse, France