Affiliation: | 1. Kekulé‐Institute of Organic Chemistry and Biochemistry, University of Bonn, Gerhard‐Domagk‐Strasse 1, 53121, Bonn (Germany), Fax: (+49)‐228‐73‐5813;2. Institute of Inorganic Chemistry, University of Bonn (Germany);3. Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna (Austria) |