1. Department of Chemistry, College of Science, Shantou University, Shantou, Guangdong 515063, P. R. China
2. Department of Chemistry and Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Shantou, Guangdong 515063, P. R. China
3. Institute of the Green Chemistry and Chemical Technology, Institute for Advanced Materials, Jiangsu University, Zhen Jiang 212000, P. R. China