1. Institut für Anorganische Chemie, University of Stuttgart, Pfaffenwaldring 55, 70550 Stuttgart, Germany, Fax: +49‐711‐685‐64241, http://www.iac.uni‐stuttgart.de/arbeitskreise/akgudat
2. The Atlantic Centre for Green Chemistry and Dept. of Chemistry, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada, http://www.smu.ca/faculty/jasonmasuda/
3. Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, P. O. Box 55 (A. I. Virtasen aukio 1), 00014 University of Helsinki, Finland