1. Department of Chemistry and Biochemistry, University of Minnesota Duluth, 1038 University Drive, Duluth, MN, 55812, USA
2. Department of Chemistry, University of North Texas, 1155 Union Circle, #305070, Denton, TX 76203-5017, USA
3. Department of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St. Catharines Ont., Canada L2S 3A1, Canada