1. Laboratoire des IMRCP CNRS UMR 5623, University of Toulouse, Université Toulouse III - Paul Sabatier, 118, Route de Narbonne, Toulouse Cedex 9 31062, France
2. Magnetic Resonance Center (CERM) and Interuniversity Consortium for Magnetic Resonance of Metallo Proteins (CIRMMP), Via L. Sacconi 6, Sesto Fiorentino 50019, Italy
3. Department of Chemistry ‘‘Ugo Schiff”, University of Florence, Via della Lastruccia 3, Sesto Fiorentino 50019, Italy
4. Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States