1. Department of Chemistry, The King’s University, Edmonton, Alberta T6B 2H3, Canada
2. Department of Chemistry, Ångström Laboratory, Box 523, 751 20 Uppsala, Sweden
3. Department of Chemistry and Biochemistry, University of Oregon, Eugene, Oregon 97403-1253, United States
4. Department of Chemical Sciences, Bridgewater State University, Bridgewater, Massachusetts 02325, United States