1. Institute for Inorganic Chemistry, University of Kiel, Max-Eyth-Straße 2, 24118 Kiel, Germany
2. Inorganic Chemistry III, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
3. North Bavarian NMR Center, 95440 Bayreuth, Germany
4. Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, 22607 Hamburg, Germany