1. Department of Chemistry, Kyungpook National University, Taegu 702-701, Korea, Department of Chemistry, Pukyung National University, Pusan 608-737, Korea, Department of Applied Chemistry, Kyungpook National University, Taegu 702-701, Korea, Department of Life Science, Kurashiki University of Science and the Arts, 2640 Nishinoura, Tsurajima-cho, Kurashiki, Okayama 712-8505, Japan, and Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan