1. Departamento de Química, Universidad de las Islas Baleares, E-07122 Palma de Mallorca, Spain, Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, I-10126 Turin, Italy, and Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Center for Biomolecules and Complex Molecular Systems, Flemingovo n. 2, CZ-16610 Prague, Czech Republic