1. Institute of Chemistry of New Materials; Universität Osnabrück; 49069 Osnabrück Germany
2. Institute of Technical Chemistry; Universität Leipzig; 04103 Leipzig Germany
3. Institute of Inorganic Chemistry; Universität Würzburg; 97074 Würzburg Germany
4. Department of Physics; Universität Osnabrück; 49069 Osnabrück Germany