1. Department of Organic Chemistry, University of Chemistry and Technology, Prague (UCTP), Technická 5, 166 28 Prague 6, Czech Republic
2. Solid State Department, UCTP, 166 28 Prague 6, Czech Republic
3. Institute of Physics AS CR v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic
4. Laboratory of NMR Spectroscopy, UCTP, 166 28 Prague 6, Czech Republic