Apparently Regular Octahedral Coordination of Ag(II) in IF6[Ag(SbF6)(3)]

The crystal structure of IF6[Ag(SbF6)(3)] has been determined by X-ray single crystal and X-ray powder diffraction analysis. The structure consists from [Ag(SbF6)(3)](-) chains and [IF6](+) cations placed between them. Ag2+ is found in regular octahedral coordination of six fluorine atoms [Ag-F = 6 x 2.170(12) angstrom]. EXAFS analysis of Jahn-Teller distortions in IF6[Ag(SbF6)(3)] shows that Ag2+ surrounding is elongated octahedral at room temperature. EXAFS signals are fitted with four short and two long Ag-F distances [4 x 2.11(1) angstrom; 2 x 2.40(2) angstrom]. This result is in apparent contradiction with X-ray diffraction studies where the [AgF6] moiety appears to be a regular octahedra. The Raman spectrum of IF6[Ag(SbF6)(3)] is in agreement with the presence of regular IF6 and deformed SbF6 groups.