1. Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyn̆ova 118, CZ-612 00 Brno, Czech Republic
2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovský Sq. 2, 162 06 Prague 6, Czech Republic
3. Institute of Physics, Academy of Sciences of the Czech Republic, v.v.i., Na Slovance 2, CZ-182 21, Prague 8, Czech Republic
4. Centrum Organické Chemie, Rybitví 296, CZ-533 54 Rybitví, Czech Republic