1. NRW Graduate School of Chemistry, University of Münster, D-48149 Münster,
Germany
2. Physikalisches
Institut and
CeNTech, University of Münster,
Heisenbergstrasse 11, D-48149 Münster, Germany
3. Laboratoire de Chimie de Coordination,
Institut de Chimie, UMR 7177 CNRS, Université de Strasbourg, 4 rue Blaise Pascal, F-67081 Strasbourg
Cedex, France
4. Merck KGaA, Frankfurter Strasse 250, D-64293 Darmstadt,
Germany