1. Department of Chemistry and Nanotechnology Research and Computation Center, Mailstop 5413, 1903 West Michigan Avenue, Western Michigan University, Kalamazoo, Michigan 49008-5410, and Departments of Biological Sciences and Chemistry and Nanotechnology Research and Computation Center, Mailstop 5410, 1903 West Michigan Avenue, Western Michigan University, Kalamazoo, Michigan 49008-5410