1. Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, University of MissouriColumbia, Columbia, Missouri 65211, Department of Chemistry, University of Delaware, Newark, Delaware 19716, Department of Chemistry, Southern Illinois University, Carbondale, Illinois 62901, Department of Chemistry, Georgia State University, Atlanta, Georgia 30302, and Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762