1. Beijing National Laboratory for Molecular Sciences; Key Laboratory of Organic Solids; Institute of Chemistry; Chinese Academy of Sciences (ICCAS); Beijing 100190 P. R. China
2. School of Chemistry and Chemical Engineering; University of Chinese Academy of Sciences; Beijing 100049 P. R. China
3. Molecular Materials and Nanosystems; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands