1. College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou 434020, Hubei, P. R. China, http://www.yangtzeu.edu.cn/
2. Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong, China 2, http://www6.cityu.edu.hk/bhdbapp/deptweb/profile/ptcl.html
3. School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, P. R. China
4. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
5. Beijing National Laboratory of Molecular Science, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China, http://www.chem.pku.edu.cn/mmm/