1. Center for
Supramolecular Optoelectronic
Materials and WCU Hybrid Materials Program, Department of Materials
Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea
2. Department of Chemistry, Kongju National Univeristy, 56 Gongjudaehak-ro, Gongju,
Chungnam 314-701, Korea