1. Department of Advanced Material Chemistry, Korea University, Sejong, Chungnam 339-700, South Korea
2. SK Energy R&D Center, 140-1 Wonchon-dong, Yuseong-gu, Daejeon 305-712, Korea
3. Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 130-701, Korea
4. Department of Chemistry & Applied Chemistry, Hanyang University, Ansan 425-791, Korea
5. Department of Theoretical Chemistry, Faculty of Chemistry, Jagiellonian University, R. Ingardena 3, 30-060 Kraków, Poland