1. Department of Chemistry, Ivan Franko Lviv National University, 6 Kyrylo and Mefodii Street, Lviv 79005, Ukraine
2. Institute of Inorganic Chemistry, Department of Chemistry and Applied Bioscience, ETH Zurich, Vladimir Prelog Weg 1, CH-8093 Zurich, Switzerland
3. Department of Mathematics, Southern Methodist University, 3200 Dyer Street, Dallas, Texas 75275, United States
4. Institute for Condensed Matter Physics, NAS of Ukraine, 1 Svientsistsky Str, Lviv, 79011, Ukraine