1. Institute for Organic and Analytical Chemistry University of Bremen Leobener Str. 7 D‐28359 Bremen Germany
2. MAPEX Center for Materials and Processes University of Bremen Bibliothekstraße 1 D‐28359 Bremen Germany
3. Institute for Materials Science University of Kiel Kaiserstr. 2 D‐24143 Kiel Germany
4. Otto‐Diels‐Institute for Organic Chemistry University of Kiel Otto‐Hahn‐Platz 4 D‐24118 Kiel Germany