Apparently regular octahedral coordination of Ag(II) in IF6[Ag(SbF6)3]

Zoran Mazej (1) , Evgeny Goreshnik (2) , Iztok Arčon (3) , Nataša Zabukovec Logar (4) , Venčeslav Kaučič (4)

1 Dep. of Inorg. Chem. and Technology
2 IJS - Jozef Stefan Institute [Ljubljana]
3 University of Nova Gorica
4 KI - National Institute of Chemistry [Llubljana]

Crystal structure of IF6[Ag(SbF6)3] has been determined by X-ray single crystal and X-ray powder diffraction analysis. IF6[Ag(SbF6)3] crystallizes in the trigonal system, space group P 1c (No. 163), with a = 10.2676(8) Å, c = 9.5552(10) Å, V = 872.38(13) Å3 and Z = 2. 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) Å). 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) Å; 2 x 2.40(2) Å). This result is in apparent contradiction with X-ray diffraction studies where [AgF6] moiety appears to be regular octahedra. Raman spectrum of IF6[Ag(SbF6)3] is in agreement with the presence of regular IF6 and deformed SbF6 groups.

Mots clés: Physical Sciences

Zoran Mazej, Evgeny Goreshnik, Iztok Arčon, Nataša Zabukovec Logar, Venčeslav Kaučič. Apparently regular octahedral coordination of Ag(II) in IF6[Ag(SbF6)3]. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2009, 636 (1), pp.224. ⟨10.1002/zaac.200900238⟩. ⟨hal-00493473⟩