1. Department of Chemistry, St. Petersburg State University, Universitetsky Pr. 26, 198504 Stary Petergof, Russian Federation
2. Department of Chemistry, University of Eastern Finland, P.O. Box 111, FI-80101, Joensuu, Finland
3. Institute of Macromolecular Compounds of the Russian Academy of Sciences, V.O. Bolshoi Pr. 31, 199004 St. Petersburg, Russian Federation