1. Department of Chemistry and Biochemistry, University of Minnesota Duluth, 1039 University Drive, Duluth, Minnesota 55812, United States
2. Marshall School, Duluth, Minnesota 55811, United States
3. Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
4. Department of Chemistry, University of Manitoba, 144 Dysart Road, Winnipeg, MB R3T 2N2, Canada
5. Tomsk State University, 36, Lenin Avenue, 634050 Tomsk, Russia
6. University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland