1. Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
2. Institute of Chemical Technology, Department of Inorganic Chemistry, 166 28 Prague 6, Czech Republic
3. Institute of Physics of the AS CR, v.v.i., Cukrovarnická 10/112, 162 00 Prague 6, Czech Republic
4. Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nám. 2., 166 10 Praha 6, Czech Republic