1. Durham University, Department of Chemistry, South Road, Durham, DH1 3LE, United Kingdom; Department of Chemistry, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia; Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 61821; and the University of Illinois, Department of Chemistry, A410 Chemical Life, Science Lab, 600 S. Matthews Avenue, Urbana, Illinois 61801