[1] Univ Grenoble 1, Lab Chim & Biol Met, F-38054 Grenoble 9, France
[2] CNRS, UMR 5249, F-38054 Grenoble, France
[3] CEA, DSV iRTSV, F-38054 Grenoble 9, France
[4] CNRS UJF CEA, Cristallog & Cristallogenese Prot Lab, Inst Biol Struct Jean Pierre Ebel, UMR 5075, F-38027 Grenoble 1, France
[5] CNRS UJF CEA, UMR E3, Lab Reconnaissance Ion & Chim Coordinat, F-38054 Grenoble 9, France