1. Department of General and Inorganic Chemistry and Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, nám. Čs. legií 565, CZ-532 10, Pardubice, Czech Republic, Faculty of Science, Charles University in Prague, Hlavova 2030, 128 40 Praha 2, Czech Republic, and Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic, Heyrovsky sq. 2, 162 06 Praha 6, Czech Republic