1. Department of Chemistry and Pharmacy Interdisciplinary Center for Molecular Materials (ICMM) Friedrich-Alexander-Universität Erlangen-Nürnberg Egerlandstr. 3 91058 Erlangen Germany
2. Departamento de Química Orgánica Universidad Autónoma de Madrid Campus de Cantoblanco 28049 Madrid Spain
3. IMDEA-Nanociencia, c/Faraday 9 Campus de Cantoblanco 28049 Madrid Spain
4. Laboratory of Organic Chemistry ETH Zurich Vladimir-Prelog-Weg 3 8093 Zurich Switzerland