1. Department of Chemistry, National Dong Hwa University, Hualien, Taiwan 97401, R.O.C, Fax: +886‐3‐8633570, http://faculty.ndhu.edu.tw/~cwl/index.htm
2. A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russian Federation