1. Chair of Inorganic and Metal-Organic Chemistry; Technical University of Munich; Lichtenbergstrasse 4 85748 Garching Germany
2. University of Duisburg-Essen; Faculty of Chemistry; Universitätstrasse 5-7 45141 Essen Germany
3. Univ Rennes, CNRS, ISCR-UMR 6226; 35000 Rennes France
4. São Carlos Institute of Chemistry; University of São Paulo, PO Box 780; 13560-970, São Carlos São Paulo Brazil