Modified tellurium subhalides in the new structure type [Te15X4]n[MOX4]2n (M = Mo, W; X = Cl, Br)

Johannes Beck*, Michael A. Pell, Jürgen Richter, James A Ibers

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The reactions of Te2Br with MoOBr3, TeCl4 with MoNCl2/MoOCl3, and Te with WBr5/WOBr3 yield black, needle-like crystals of [Te15X4][MOX4]2 (M = Mo, W; X = Cl, Br). The crystal structure determinations ([Te15Br4][MoOBr4]2: monoclinic, Z = 1, C2/m, a = 1595.9(4) pm, b = 403.6(1) pm, c = 1600.4(4) pm, β = 112.02(2)°; [Te15Cl4][MoOCl4]2: C2/m, a = 1535.3(5) pm, b = 402.8(2) pm, c = 1569.6(5) pm, β = 112.02(2)°; [Te15Br4][WOBr4]2: C2, a = 1592.4(4) pm, b = 397.5(1) pm, c = 1593.4(5) pm, β = 111.76(2)° show that all three compounds are isotypic and consist of one-dimensional ([Te15X4]2+)n and ([MOX4]-), strands. The structures of the cationic strands are closely related to the tellurium subhalides Te2X (X = Br, I). One of the two rows of halogen atoms that bridges the band of condensed Te6 rings is stripped off, and additionally one Te position has only 15% occupancy which leads to the formula ([Te15X4]2+)n (X = Cl, Br) for the cation. The anionic substructures consist of tetrahalogenooxometalate ions [MOX4]- that are linked by linear oxygen bridges to polymeric strands. The compounds are paramagnetic with one unpaired electron per metal atom indicating oxidation state Mv, and are weak semiconductors.

Original languageEnglish (US)
Pages (from-to)473-478
Number of pages6
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Volume622
Issue number3
DOIs
StatePublished - Jan 1 1996

Keywords

  • Crystal structure
  • Molybdenum halides, tungsten halides
  • Oxotetrahalogeno-metallates
  • Tellurium polycations
  • Tellurium subhalides

ASJC Scopus subject areas

  • Inorganic Chemistry

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