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New mixed-valent alkali chain sulfido ferrates A1+x[FeS2] (A = K, Rb, Cs; x = 0.333–0.787)

  • Michael Schwarz , Pirmin Stüble , Katharina Köhler and Caroline Röhr EMAIL logo
Published/Copyright: September 4, 2020
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Zeitschrift für Kristallographie - Crystalline Materials
From the journal Zeitschrift für Kristallographie - Crystalline Materials Volume 235 Issue 8-9

Abstract

Four new mixed-valent chain alkali metal (A) sulfido ferrates of the general structure family A1+xFexIIFe1−xIIIS2 were synthesized in the form of tiny green-metallic needles from nearly stoichiometric melts reacting elemental potassium with natural pyrite (A = K) or previously prepared Rb2S/Cs2S2 with elemental iron and sulfur (A = Rb/Cs). The crystal structures of the compounds were determined by means of single crystal X-ray diffraction: In the (3+1)D modulated structure of K7.15[FeS2]4 (space group Ccce(00σ3)0s0, a = 1363.87(5), b = 2487.23(13), c = 583.47(3) pm, q = 0,0,0.444, R1 = 0.055/0.148, x = 0.787), a position modulation of the two crystallographically different undulated [FeS4/2]∞1 tetrahedra chains and the surrounding K cations is associated with an occupation modulation of one of the three potassium sites. In the case of the new monoclinic rubidium ferrate Rb4[FeS2]3 (x = 13; space group P21/c, a = 1640.49(12), b = 1191.94(9), c = 743.33(6) pm, β = 94.759(4)°, Z = 4, R1 = 0.1184) the undulation of the tetrahedra chain is commensurate, the repetition unit consists of six tetrahedra. In the second new Rb ferrate, Rb7[FeS2]5 (x = 0.4; monoclinic, space group C2/c, K7[FeS2]5-type; a = 2833.9(2), b = 1197.36(9), c = 744.63(6) pm, β = 103.233(4)°, Z = 4, R1 = 0.1474) and its isotypic mixed Rb/Cs-analog Rb3.6Cs3.4[FeS2]5 (a = 2843.57(5), b = 1226.47(2), c = 759.890(10) pm, β = 103.7170(9)°, R1 = 0.0376) the chain buckling leads to a further increased repetition unit of 10 tetrahedra. For all mixed-valent ferrates, the Fe–S bond lengths continuously increase with the amount (x) of Fe(II). The buckling of the chains is controlled through the local coordination of the S atoms by the variable number of A cations of different sizes.

Keywords: alkali metals; (3+1)D modulated structure; sulfido ferrates; tetrahedra chains

Dedicated to Professor Dr. Ulrich Müller on the occasion of his 80th birthday.

Corresponding author: Caroline Röhr, Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 21, D-79104Freiburg, Germany, E-mail:

Funding source: Deutsche Forschungsgemeinschaft

Acknowledgments

We would like to thank the Deutsche Forschungsgemeinschaft for financial support and Miriam Haas for contributing in the preparative work.

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: Deutsche Forschungsgemeinschaft

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/zkri-2020-0023).

Received: 2020-02-29
Accepted: 2020-04-03
Published Online: 2020-09-04
Published in Print: 2020-09-25

© 2020 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. In this issue
  3. Original papers
  4. Ulrich Müller zum 80. Geburtstag gewidmet
  5. Laboratory synthesis and characterization of Knasibfite K3Na4[SiF6]3[BF4] and the homologous Ge compound K3Na4[GeF6]3[BF4]
  6. The crystal structures of α-Rb7Sb3Br16, α- and β-Tl7Bi3Br16 and their relationship to close packings of spheres
  7. Beryllium triflates: synthesis and structure of BeL2(OTf)2 (L=H2O, THF, nBu2O)
  8. Synthesis and crystal structures of two layered Cu(I) and Ag(I) iodidometalates
  9. New mixed-valent alkali chain sulfido ferrates A1+x[FeS2] (A = K, Rb, Cs; x = 0.333–0.787)
  10. Structure solution of incommensurately modulated La6MnSb15
  11. Polymorphs of VO(PO3)2: synthesis and crystal structure refinement revisited
  12. On tungstates of divalent cations (III) – Pb5O2[WO6]
  13. Hydrogen order in hydrides of Laves phases
  14. High-pressure synthesis of SmGe3
  15. The complete series of sodium rare-earth metal(III) chloride oxotellurates(IV) Na2RE3Cl3[TeO3]4 (RE = Y, La–Nd, Sm–Lu)
  16. Structural diversity of salts of terpyridine derivatives with europium(III) located in both, cation and anion, in comparison to molecular complexes
  17. Elucidating structure–property relationships in imidazolium-based halide ionic liquids: crystal structures and thermal behavior
  18. Syntheses and crystal structures of the manganese hydroxide halides Mn5(OH)6Cl4, Mn5(OH)7I3, and Mn7(OH)10I4
  19. Site-preferential copper substitution for silicon leads to Cu-chains in the new ternary silicide Ir4−xCuSi2
  20. Syntheses and crystal structures of solvate complexes of alkaline earth and lanthanoid metal iodides with N,N-dimethylformamide
https://doi.org/10.1515/zkri-2020-0023
Keywords for this article
alkali metals; (3+1)D modulated structure; sulfido ferrates; tetrahedra chains

Articles in the same Issue

  1. Frontmatter
  2. In this issue
  3. Original papers
  4. Ulrich Müller zum 80. Geburtstag gewidmet
  5. Laboratory synthesis and characterization of Knasibfite K3Na4[SiF6]3[BF4] and the homologous Ge compound K3Na4[GeF6]3[BF4]
  6. The crystal structures of α-Rb7Sb3Br16, α- and β-Tl7Bi3Br16 and their relationship to close packings of spheres
  7. Beryllium triflates: synthesis and structure of BeL2(OTf)2 (L=H2O, THF, nBu2O)
  8. Synthesis and crystal structures of two layered Cu(I) and Ag(I) iodidometalates
  9. New mixed-valent alkali chain sulfido ferrates A1+x[FeS2] (A = K, Rb, Cs; x = 0.333–0.787)
  10. Structure solution of incommensurately modulated La6MnSb15
  11. Polymorphs of VO(PO3)2: synthesis and crystal structure refinement revisited
  12. On tungstates of divalent cations (III) – Pb5O2[WO6]
  13. Hydrogen order in hydrides of Laves phases
  14. High-pressure synthesis of SmGe3
  15. The complete series of sodium rare-earth metal(III) chloride oxotellurates(IV) Na2RE3Cl3[TeO3]4 (RE = Y, La–Nd, Sm–Lu)
  16. Structural diversity of salts of terpyridine derivatives with europium(III) located in both, cation and anion, in comparison to molecular complexes
  17. Elucidating structure–property relationships in imidazolium-based halide ionic liquids: crystal structures and thermal behavior
  18. Syntheses and crystal structures of the manganese hydroxide halides Mn5(OH)6Cl4, Mn5(OH)7I3, and Mn7(OH)10I4
  19. Site-preferential copper substitution for silicon leads to Cu-chains in the new ternary silicide Ir4−xCuSi2
  20. Syntheses and crystal structures of solvate complexes of alkaline earth and lanthanoid metal iodides with N,N-dimethylformamide
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