1. Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Max Eyth-Str. 2, 24118 Kiel, Germany
2. Research Unit of Noxious Chemistry and Environmental Engineering, Department of Chemistry, Faculty of Science University of Dschang, P.O. Box 67, Dschang, Cameroon
3. Instituto de Física da Universidade de São Paulo, São Paulo 05508-090, Brazil
4. Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607 Hamburg, Germany