1. Institute of Chemistry, Academia Sinica, Nangang, Taipei 115, Taiwan
2. Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei 106, Taiwan
3. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
4. Department of Chemistry and Biochemistry, National Chung-Cheng University, Minxiong Township, Chiayi County 621, Taiwan
5. Department of Chemistry, National Central University, Jhong-Li, Tao-yuan 32001, Taiwan