[1] Univ Stockholm, Arrhenius Lab, Dept Organ Chem, S-10691 Stockholm, Sweden
[2] Univ Stockholm, Arrhenius Lab, Dept Struct Chem, S-10691 Stockholm, Sweden
[3] Univ Paris 11, Chim Inorgan Lab, UMR N33V,CNRS,LCR CEA, Inst Chim Mol & Mat Orsay, F-91405 Orsay, France
[4] Royal Inst Technol, Stockholm, Sweden