1. Magnetic Resonance Center, University of Florence, via L. Sacconi 6, Sesto Fiorentino,
Italy
2. Department of Chemistry, University of Florence, via della Lastruccia 3, Sesto
Fiorentino, Italy
3. Institute
of Molecular Biology
and Biotechnology, Foundation for Research and Technology Hellas, Heraklion 70013, Crete, Greece
4. Department of Materials Science
and Technology, University of Crete, Heraklion
71003, Crete, Greece