New Ternary Group-IV Tellurides with Extensive Te-Te Bonding: The Low-Dimensional Compounds Cs3Ti3Te11 and Cs5Hf5Te26

Michael A. Pell, James A. Ibers*

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

The new compounds Cs3Ti3Te11 and Cs5Hf5Te26 have been synthesized from a Cs2Ten reactive flux. Cs3Ti3Te11 crystallizes in the monoclinic space group C2h5-P21/n with four formula units in a cell of dimensions a = 10.776(4) Å, b = 15.281(5) Å, c = 14.843(5) Å, β= 92.29(1)○, V = 2442(2) Å3 (T = 115 K). The structure has been refined to an agreement index of Rw(F2) of 0.084 for 154 variables and 4812 observations; the value of R1 (on F for Fo2 > 2σ(Fo2)) is 0.034. Cs5Hf5Te26 crystallizes in the monoclinic space group C2h5-P21/c with four formula units in a cell of dimensions a = 19.256(10) Å, b = 9.487(6) Å, c = 27.94 (2) Å, β = 98.40(8)○, V = 5049(5) Å3 (T = 115 K). This structure has been refined to an agreement index of Rw(F2) of 0.171 for 145 variables and 3496 observations; the value of R1 (on F for Fo2 > 2σ(Fo2)) is 0.084. Both structures comprise chains of Te-bridged group-IV metals and both feature extensive Te-Te bonding within the chains. In Cs3Ti3Te11 individual 1[Ti3Te113-] chains are separated by Cs+ cations to form a truly one-dimensional structure. The chains in Cs5Hf5Te26 on the other hand are tethered through Te-Te interactions to form a pseudolayered structure. Assignment of oxidation states by an assessment of Te-Te bonding is not possible, owing to the plethora of intermediate Te-Te interactions. The electrical conductivity of Cs3Ti3Te11 is ≈9.2 × 10-5 Ω-1 cm-1 at 25 °C.

Original languageEnglish (US)
Pages (from-to)1386-1390
Number of pages5
JournalChemistry of Materials
Volume8
Issue number7
DOIs
StatePublished - Jul 1996

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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