1. Department of Chemistry, National Tsing Hua University, 101, Sec. 2, Kuang Fu Road, Hsinchu 30013, Taiwan
2. Escuela de Quimica, Universidad de Costa Rica, San Pedro, San Jose, Costa Rica
3. Department of Applied Chemistry, National Chiao Tung University, 1001, Ta Hsueh Road, Hsinchu 30010, Taiwan