1. Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
2. Nikolaev Institute of Inorganic Chemistry; Siberian Division of RAS; Acad. Lavrentyev Str. 3 630090 Novosibirsk Russia
3. Novosibirsk State University; Pirogova Str. 2 630090 Novosibirsk Russia