1. Fujian Key Laboratory of Polymer Materials, College of Chemistry and Chemical Engineering, College of Materials Science and Engineering, Fujian Normal University Fuzhou, Fujian 350007, P. R. China, http://chce.fjnu.edu.cn/
2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Science, Fuzhou, Fujian 350002, China