1. Department of Chemistry and Mathematics & Whitaker Center, College of Arts & Sciences, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, Florida 33965, School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, Georgia 30332, and Interdisciplinary Nanotoxicity Center, Department of Chemistry, Jackson State University, P.O. Box 17910, 1400 J. R. Lynch Street, Jackson, Mississippi 39217