1. Department of Applied Science, National Taitung University, Taitung 950, Taiwan
2. Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan
3. Department of Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan
4. Universität Göttingen, Institut für Anorganische Chemie, Tammannstraße 4, D-37077 Göttingen, Germany
5. Instrumentation Center, National Taiwan University, Taipei 107, Taiwan
6. Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 807, Taiwan