1. Institute of Particle Technology, Friedrich-Alexander-University Erlangen-Nuremberg, Cauerstrasse 4, 91058 Erlangen, Germany, Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nuremberg, Egerlandstrasse 3, 91058 Erlangen, Germany, and Institute of Organic Chemistry, Friedrich-Alexander-University Erlangen-Nuremberg, Henkestrasse 42, 91054 Erlangen, Germany