1. Guangzhou Institute of ChemistryChinese Academy of Sciences Guangzhou 510650 P. R. China
2. School of Chemistry SciencesUniversity of Chinese Academy of Sciences Beijing 10049 P. R. China
3. Guangdong Provincial Key Laboratory of Organic Polymer Materials for Electronics Guangzhou 510650 P. R. China
4. CAS Engineering Laboratory for Special Fine Chemicals Guangzhou 510650 P. R. China