## Abstract

The new compounds Cs_{3}Ti_{3}Te_{11} and Cs_{5}Hf_{5}Te_{26} have been synthesized from a Cs_{2}Te_{n} reactive flux. Cs_{3}Ti_{3}Te_{11} crystallizes in the monoclinic space group C_{2h}^{5}-P2_{1}/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) Å^{3} (T = 115 K). The structure has been refined to an agreement index of R_{w}(F^{2}) of 0.084 for 154 variables and 4812 observations; the value of R_{1} (on F for F_{o}^{2} > 2σ(F_{o}^{2})) is 0.034. Cs_{5}Hf_{5}Te_{26} crystallizes in the monoclinic space group C_{2h}^{5}-P2_{1}/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) Å^{3} (T = 115 K). This structure has been refined to an agreement index of R_{w}(F^{2}) of 0.171 for 145 variables and 3496 observations; the value of R_{1} (on F for F_{o}^{2} > 2σ(F_{o}^{2})) is 0.084. Both structures comprise chains of Te-bridged group-IV metals and both feature extensive Te-Te bonding within the chains. In Cs_{3}Ti_{3}Te_{11} individual _{∞}^{1}[Ti_{3}Te_{11}^{3-}] chains are separated by Cs^{+} cations to form a truly one-dimensional structure. The chains in Cs_{5}Hf_{5}Te_{26} 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 Cs_{3}Ti_{3}Te_{11} is ≈9.2 × 10^{-5} Ω^{-1} cm^{-1} at 25 °C.

Original language | English (US) |
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Pages (from-to) | 1386-1390 |

Number of pages | 5 |

Journal | Chemistry of Materials |

Volume | 8 |

Issue number | 7 |

DOIs | |

State | Published - Jul 1996 |

## ASJC Scopus subject areas

- Chemistry(all)
- Chemical Engineering(all)
- Materials Chemistry

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