1. U-60, Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-4060, Department of Chemical Engineering and Institute of Materials Science, and Department of Electrical Engineering and Applied Physics, Yale University, New Haven, Connecticut 06511, Fujitsu Laboratories, Ltd., 1015 Kamikodanaka, Nakahara 211 Japan, and Department of Chemistry, Nagasaki University, Bunkyomachi 1-14 Nagasaki 852 Japan