[1] Univ Pardubice, Dept Gen & Inorgan Chem, Fac Chem Technol, CZ-53210 Pardubice, Czech Republic
[2] Res Inst Organ Synth VUOS, CZ-53354 Pardubice 20, Czech Republic
[3] Acad Sci Czech Republ, Inst Macromol Chem, CZ-16206 Prague 6, Czech Republic
[4] Vrije Univ Brussel, Eenheid Algemene Chem ALGC, Fac Wetenschappen, B-1050 Brussels, Belgium