1. Department of Chemistry and Pharmacy; Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstr. 3 91058 Erlangen Germany
2. Siemens AG; Günter-Scharowsky-Str. 1 91058 Erlangen Germany
3. Department of Chemistry and Pharmacy; Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstr. 1 91058 Erlangen Germany