1. Anorganische Chemie III and Nordbayerisches NMR-Zentrum, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany
2. Bayerisches Geoinstitut, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany
3. Institute for Molecules and Materials/Magnetic Resonance Research Center, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
4. Anorganische Chemie I, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany