[1] CNRS, UMR 6226, Equipe Organomet & Mat Mol, F-35042 Rennes, France
[2] Univ Bern, Dept Chem & Biochem, CH-3012 Bern, Switzerland
[3] CNRS, UPR 8241, Chim Coordinat Lab, F-31077 Toulouse, France
[4] Univ Neuchatel, Inst Chim, CH-2007 Neuchatel, Switzerland