1. Department
of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, 842 15 Bratislava, Slovakia
2. Institute of Inorganic Chemistry of the Czech Academy of Sciences, v. v. i., Husinec-Řež
1001, 250 68 Řež, Czech Republic
3. Institute
of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská
cesta 9, 845 36 Bratislava, Slovakia