1. Contribution from the Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan, Chemistry Department for Materials, Faculty of Engineering, Mie University, Tsu, Mie 514-8507, Japan, Department of Chemistry, College of Natural Sciences, Pusan National University, Pusan 609-735, Korea, Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, and Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742