1. Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1a, 52074 Aachen, Germany
2. Inorganic Chemistry I, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
3. Department of Chemistry, Inorganic Chemistry IV, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
4. Fraunhofer UMSICHT, Osterfelder Straße 3, 46047 Oberhausen, Germany