1. Department of Chemistry, NIS Center and INSTM Reference Center, University of Turin, 10125 Turin, Italy
2. European Synchrotron Radiation Facility, CS 40220, 38043 Grenoble Cedex 9, France
3. Institute of Inorganic Chemistry, Kiel University, Max-Eyth-Str. 2, 24118 Kiel, Germany
4. The Swiss-Norwegian Beamlines (SNBL) at ESRF, BP 220, 38043 Grenoble, France
5. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, P.O. Box 165, Taiyuan, Shanxi 030001, P. R. China