1. Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
2. Department of General and Inorganic Chemistry University of Pardubice Studentská 573 532 10 Pardubice Czech Republic
3. Faculty of Science University of Hradec Králové Rokitanského 62 500 03 Hradec Králové 3 Czech Republic
4. Institute of Inorganic Chemistry Czech Academy of Sciences 250 68 Řež near Prague Czech Republic
5. G. A. Razuvaev Institute of Organometallic Chemistry RAS 49 Tropinin St. 603950 Nizhny Novgorod Russian Federation
6. Institut für Experimentalphysik Freie Universität Berlin Arnimallee 14 14195 Berlin Germany