1. Department of Chemistry; North Carolina State University; Raleigh NC 27695-8204 USA
2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter (FJIRSM); Chinese Academy of Sciences (CAS); Fuzhou 350002 China
3. State key Laboratory of Crystal Materials; Shandong University; Jinan 250100 China
4. Max-Planck-Institute for Solid State Research; Heisenbergstr. 1 D-70569 Stuttgart Germany