1. CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, Toulouse F-31077 Cedex 4, France
2. Université de Toulouse, UPS, INPT, Toulouse F-31077 Cedex 4, France
3. CNR - National Research Council of Italy, ICCOM
- Institute for chemistry of organo-metallic compounds, via Madonna del Piano 10, I-50019 Sesto Fiorentino, Firenze, Italy