1. Institute of Inorganic Chemistry of the Czech Academy of Sciences; 250 68 Husinec-Řež Czech Republic
2. Institute of Organic Chemistry and Biochemistry of, the Czech Academy of Sciences; 166 10 Praha 6 Czech Republic
3. Department of Chemistry; University of York; Heslington York YO10 5DD UK
4. Present address: School of Engineering and Physical Sciences; Heriot-Watt University; Edinburgh EH14 4AS UK
5. Fakultät für Chemie, Lehrstuhl für Anorganische Chemie, und Strukturchemie, Centrum für molekulare Materialien CM 2; Universität Bielefeld; Universitätsstrasse 25 33615 Bielefeld Germany
6. Present addresses: Department of Physical Chemistry; M. V. Lomonosov Moscow State University; GSP-1, 1-3 Leninskiye Gory 119991 Moscow Russian Federation
7. FS-SMP Deutsches Elektronen-Synchrotron (DESY); Notkestrasse 85, Building 25f, Room 353 22607 Hamburg Germany