1. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská Cesta 9, 842 36 Bratislava, Slovak Republic, Computational Center for Molecular Structure and Interactions, Department of Chemistry, Jackson State University, 1400 Lynch Street, P.O. Box 17910, Jackson, Mississippi 39217, and Institute for Scintillation Materials, National Academy of Sciences of Ukraine, 60 Lenina Avenue, 61001 Kharkov, Ukraine