1. College of Chemistry and Environmental Science Key Laboratory of Chemical Biology of Hebei Province Key Laboratory of Medicinal Chemistry and Molecular Diagnosis Ministry of Education Hebei University Baoding 071002 P. R. China
2. Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences No. 189 Songling Road Qingdao 266101 P. R. China
3. Institute of Chemistry Chinese Academy of Sciences Beijing 100191 P. R. China
4. Centre of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences No. 19A Yuquan Road Beijing 100049 P. R. China