1. Department of Chemistry, Multiphase Reaction Engineering, Technische Universität Berlin, TC8, Straße des 17. Juni 124, 10623 Berlin, Germany
2. Higher Teacher Training College, Department of Chemistry, University of Bamenda, P.O.Box 39 Bambili, Cameroon
3. Department of Chemistry, Functional materials, Technische Universität Berlin, BA216 Hardenbergstr. 40, 10623 Berlin, Germany
4. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany