1. CNRS, LCC (Laboratoire de Chimie de
Coordination), 205 route de Narbonne, BP 44099, F-31077
Toulouse Cedex 4, France
2. Université de Toulouse, UPS,
INPT, F-31077 Toulouse Cedex 4, France
3. Arnold and
Mabel Beckman Laboratories of Chemical Synthesis, California Institute of Technology,
Pasadena, California 91125, United States