1. Institute of Macromolecular Chemistry, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
2. Department of Chemistry, University of Bayreuth, 95447 Bayreuth, Germany
3. JCNS-1/ICS-1, Forschungszentrum Jülich, 52425 Jülich, Germany
4. Physical Chemistry, RWTH University, 52074 Aachen, Germany