1. Department of Chemistry, Sichuan Normal University, Chengdu 610066, People's Republic of China, Faculty of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China, State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China, and Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong