1. Department of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Chinju 660-701, Korea, Department of Chemistry and Biology, Research Institute of Natural Science, Changwon National University, Changwon 641-773, Korea, Department of Sciece Education, Chinju National University of Education, Chinju 660-756, Korea, and Rigaku Corporation, 3-9-12 Matsubara-cho, Akishima-shi, Tokyo 196-8666, Japan yjyoon@nongae.gsnu.ac.kr