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