1. Department of Chemistry, Kyungpook National University, Daegu 702-701, South Korea
2. Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
3. R&D Center Kagoshima, Kyocera, 1-4 Kokubu Yamashita-cho, Kirishima-shi, Kagoshima 899-4312, Japan