1. Technische Universität Darmstadt; Ernst-Berl-Institute for Technical Chemistry and Macromolecular Science; Alarich-Weiss-Straße 8 64287 Darmstadt Germany
2. Technische Universität Darmstadt; Eduard-Zintl-Institute of Inorganic and Physical Chemistry; Alarich-Weiss-Strasse 12 64287 Darmstadt Germany