[1] Univ Chem & Technol, Dept Solid State Chem, Tech 5, Prague 16628 6, Czech Republic
[2] Univ Zurich, Dept Chem, Winterthurerstr 190, CH-8057 Zurich, Switzerland
[3] Zentiva KS, Kabelovny 130, Prague 10237 10, Czech Republic
[4] Univ Chem & Technol, Tech 5, Dept Chem Engn, Prague 16628 6, Czech Republic