1. Institute of Inorganic Chemistry, Leibniz University Hannover, 30167 Hannover, Germany
2. Institute of Inorganic Chemistry, FCHPT, Slovak University of Technology, 81237 Bratislava, Slovakia
3. Regional Centre of Advanced Technologies and Materials, Department of Inorganic Chemistry, Faculty of Science, Palacký University, 77900 Olomouc, Czech Republic
4. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1‐1‐1, Tsukuba 305‐8571, Japan
5. Department of Chemistry, FPV, University of SS Cyril and Methodius, 91701 Trnava, Slovakia, http://kchem.fpv.ucm.sk/boca/index.html