1. Contribution from the Institute of Chemical and Engineering Sciences, No. 1 Pesek Road, Jurong Island, Singapore 627833, Department of Chemistry, Southern Methodist University, Dallas, Texas 75275-0314, Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115-2862, and International Institute of Nano and Molecular Medicine, University of MissouriColumbia, 202 Schlundt Hall, Columbia, Missouri 65211