1. Department of Chemistry, Oakland University, 146 Library Drive, Rochester, MI 48309-4479, USA
2. Department of Chemistry and Biochemistry, University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
3. University of Michigan, Department of Chemistry, Ann Arbor, MI, USA
4. University of Jyvaskyla, Department of Chemistry, P. O. Box 35, 40014 Jyvaskyla, Finland