1. Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
2. Department of Chemistry, Acadia University, 6 University Avenue, Wolfville, Nova Scotia B4P 2R6, Canada
3. Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, Greensboro, North Carolina 27402-6170, United States