1. Contribution from the Debye Institute, Department of Metal-Mediated Synthesis, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands, Forschungszentrum Jülich GmbH, Institut für Biotechnologie, D-52425 Jülich, Germany, Bijvoet Center for Biomolecular Research, Department of Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands, Department of Molecular Spectroscopy, University of Nijmegen, Toernooiveld, 6525 ED, Nijmegen, The Netherlands