1. Inorganic Chemistry Department, Ivan Franko National University, Kyryla and Mephodiya Street 6, 79005 Lviv, Ukraine
2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw, Poland
3. Institut für Anorganische und Analytische Chemie, Universität Münster, Wilhelm-Klemm-Strasse 8, D-48149 Münster, Germany