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 ul. Pirogova, 2 630090 Novosibirsk Russia