1. State Key Laboratory of Structural Chemistry; Fujian Institute of Research on the Structure of Matter; Chinese Academy of Sciences, Fuzhou; Fujian 350002 P. R. China
2. MOE Key Laboratory of Cluster Science; School of Chemistry; Beijing Institute of Technology; Beijing 100081 P. R. China
3. Department of Chemistry; Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province; Shantou University, Shantou; Guangdong 515063 P. R. China