1. National Hu-Wei Institute of Technology, 632, Yunlin, Taiwan, R.O.C., Department of Chemistry and Biochemistry, National Chung-Cheng University, 621, Chia Yi, Taiwan, R.O.C., Department of Chemistry, Fu-Jen Catholic University, 242, Taipei, Taiwan, R.O.C., and Department of Chemistry, National Taiwan University, 106, Taipei, Taiwan, R.O.C.