1. Institute of Organic Chemistry; Technical University of Darmstadt, Alarich-Weiss-Street 4; Darmstadt 64287 Germany
2. Department of Molecular Physics, Faculty of Chemistry; Lodz University of Technology, Zeromskiego 116; 90-924 Lodz Poland
3. Max Planck Institute for Polymer Research, Ackermannweg 10; Mainz 55128 Germany