1. Department of Organic Chemistry University of Chemistry and Technology, Prague Technická 5 166 28 Prague 6 Czech Republic
2. Department of Inorganic Chemistry University of Chemistry and Technology, Prague Technická 5 166 28 Prague 6 Czech Republic
3. Institute for Biophysics and Physical Biochemistry University of Regensburg D-93053 Regensburg Germany
4. Institute of Physical and Theoretical Chemistry University of Regensburg D-93053 Regensburg Germany