1. Department of Chemistry, Sejong University, Seoul 143-747, Republic of Korea
2. Department of Chemistry and Physics, College of Science and Mathematics, Arkansas State University, Jonesboro, Arkansas 72467, United States
3. Regional Center of Advanced Technologies and Materials, Faculty of Science, Palacký University, Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic