1. Contribution from the Department of Biochemistry, University of Mississippi Medical Center, 2500 N. State Street, Jackson, Mississippi 39216-4505, Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China, Department of Chemistry, Georgia State University, Atlanta, Georgia 30303, and Department of Chemistry and Biochemistry, Mississippi College, Clinton, Mississippi 39058