a
University of Basel, Department of Chemistry, St. Johannsring 19, CH-4056 Basel, Switzerland
E-mail: marcel.mayor@unibas.ch
;
Fax: +41 61 267 1016
;
Tel: +41 61 267 1006
b
Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, P. O. Box 3640, Karlsruhe, Germany