1. Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, E-28040 Madrid, Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91058 Erlangen, Germany, Computer-Chemie-Centrum and ICMM, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nägelsbachstrasse 25, 91052 Erlangen, Germany, and IMDEA-Nanociencia, E-28049 Madrid, Spain