1. Department of Chemistry, University of Texas at Dallas, P.O. Box 830688, Richardson, Texas 75083-0688, The Mary Nell and Ralph B. Rogers Magnetic Resonance Center, Department of Radiology, University of Texas Southwestern Medical Center, 5801 Forest Park Road, Dallas, Texas 75235-9085, Department of Inorganic & Analytical Chemistry, Lajos Kossuth University, H-4010 Debrecen, Hungary, Department of Biochemistry, Faculty of Science & Technology, University of Coimbra, 3049 Coimbra, Portugal, and The...