1. Department of General and Inorganic Chemistry, University of Pardubice, nám. Čs. legií 565, 532 10 Pardubice, Czech Republic, Department of Polymers, Institute of Chemical Technology, Technická 5, 166 26 Prague 6, Czech Republic, Institute of Material Science, Brno University of Technology, Purkyňova 118, 612 00 Brno, Czech Republic, and Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic