1. Department Chemie Ludwig-Maximilians-Universität Butenandtstrasse 5–13 (D) 81377 München Germany
2. Faculty for Chemistry and Biochemistry Chair of Inorganic Chemistry – Bioinorganic Chemistry Ruhr University Bochum Universitätsstrasse 150 44801 Bochum Germany
3. Institute of Physical and Theoretical Chemistry University Regensburg Universitätstr. 31 93053 Regensburg Germany