1. State Key Laboratory of Fine Chemicals, DUT‐KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology, Zhongshan Road 158‐46, Dalian 116012, P. R. China, Fax: +86‐411‐83702185
2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Fuzhou 350002, P. R. China
3. Organic Chemistry, Royal KTH Chemical Science and Engineering, 10044, Stockholm, Sweden