NaMIIZr2F11 (MII = Mn, Fe, Co, Ni, Zn) Fluorides

<h2>Acta Crystallographica Section C</h2><h3>Crystal Structure Communications</h3><h3>0108-2701</h3> <h2>inorganic compounds</h2> Volume 51 Part 11 Pages 2207-2210 November 1995 <h2>Na M II Zr 2 F 11 ( M II = Mn, Fe, Co, Ni, Zn) Fluorides</h2> M. H. Kettani, D. Avignant and J. Metin The crystal structures of the fluorides Na M II Zr 2 F 11 ( M II = Mn, Fe, Co, Ni, Zn) have been refined using single-crystal X-ray diffraction data; these compounds are isostructural with AgPdZr 2 F 11 . Attempts to prepare the analogous Cr II and Cu II fluorides failed, probably because these cations would show a strong Jahn-Teller effect. Acta Cryst. (1995). C51, 2207-2210 NaMnZr2Fu (Mn = Mn, Fe, Co, Ni, Zn) Fluorides MOHAMMED HAKAM KETrANI, DANIEL AVIGNANT AND JACQUES METIN Laboratoire de Chimie des Solides, URA 444, CNRS, Universitd Blaise Pascal, 63177 Aubi~re CEDEX, France (Received 1 February 1995; accepted 9 May 1995) Abstract The structures of NaMnZr2Fll (sodium manganese undecafluorodizirconate), NaFeZr2F11, NaCoZr2Fll, NaNiZr2Fll and NaZnZr2Fll have been refined from single-crystal X-ray diffraction data. These compounds are isostructural with AgPdZr2Fll. They are charac- terized by isolated compressed octahedra, which are slightly tetragonally distorted, surrounding the divalent cations of the first-row transition metals. Attempts at the growth of single crystals of divalent chromium (d4) and copper (d9) failed, probably because these cations are unstable as a result of the Jahn-Teller effect. Comment Compounds of the general formula NaMHZr2F11 can be divided into two very different structure types according to the nature of the divalent cation, M2÷....