1. Institute for Inorganic Chemistry, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
2. Felix Bloch Institute for Solid State Physics, Universität Leipzig, Linnéstraße 5, D-04103 Leipzig, Germany
3. Faculty of Chemistry and Biochemistry, Ruhr University Bochum, D-44801 Bochum, Germany
4. Department of Inorganic Chemistry, University of Kiev, Volodimirska Street 64, UA-25033 Kiev, Ukraine