1. Department of Chemistry “Ugo Schiff”, University of Florence, Sesto Fiorentino 50019, Italy
2. Magnetic Resonance Center (CERM), University of Florence, Sesto Fiorentino 50019, Italy
3. Department of Experimental and Clinical Biomedical Sciences “Mario Serio”, University of Florence, Florence 50134, Italy
4. Consorzio Interuniversitario Risonanze Magnetiche di Metallo Proteine (CIRMMP), Sesto Fiorentino 50019, Italy