1. Univ. Bordeaux CNRS Centre de Recherche Paul Pascal CRPP UMR 5031 33600 Pessac France
2. Current address: Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of Chemistry Sun Yat-Sen University Guangzhou 510275 P. R. China
3. Current address: Department of Chemistry Technical University of Denmark 2800, Kgs. Lyngby Denmark
4. Department of Chemistry Florida State University
5. National High Magnetic Field Laboratory Florida State University Tallahassee FL 32306 USA
6. Chemistry Faculty University of the Basque Country UPV/EHU 20018 Donostia-San Sebastián Spain
7. Current address: Solid State and Structural Chemistry Unit Indian Institute of Science C.V. Raman Road Bangalore 560012 India
8. Department of Physics Florida State University
9. ESRF-The European Synchrotron 38043 Grenoble Cedex 9 France
10. CNRS ICMCB UPR 9048 Univ. Bordeaux 33608 Pessac France
11. Department of Chemistry University of California Berkeley USA
12. Department of Chemical and Biomolecular Engineering University of California Berkeley USA
13. Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA