1. Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3012 Bern, Switzerland
2. National Centre for Computational Design and Discovery of Novel Materials (MARVEL), 1015 Lausanne, Switzerland
3. Department of Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Str. 2A, A-5020 Salzburg, Austria