1. Univ Rennes, CNRS, ISCR-UMR 6226, Rennes F-35000, France
2. Department of Chemistry “Ugo Schiff”, University of Florence, Via della Lastruccia 13, Sesto Fiorentino, Florence 50019, Italy
3. Univ Rennes, Centre de Diffractométrie X (CDIFX), ISCR-UMR 6226, Rennes F-35000, France