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Rb5Mo27Se31, a novel ternary reduced molybdenum selenide containing Mo12 and Mo15 clusters

S Picard1, P Gougeon, M Potel

  • 1Laboratoire de Chimie du Solide et Inorganique Moléculaire, URA CNRS No. 6511, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes CEDEX, France.

Acta Crystallographica. Section C, Crystal Structure Communications
|June 16, 2001
PubMed

Insights

The crystal structure of pentarubidium heptacosamolybdenum hentriacontaselenium (Rb5Mo27Se31) features a mix of Mo12Se14Se6 and Mo15Se17Se6 clusters. These clusters connect via Mo-Se bonds, with rubidium cations filling interstitial spaces.

Area of Science:

  • Solid-state chemistry
  • Inorganic chemistry
  • Crystallography

Background:

  • Molybdenum-selenium clusters are of interest for their unique structural and electronic properties.
  • Understanding the assembly of complex cluster compounds is crucial for materials science.

Purpose of the Study:

  • To determine the crystal structure of Rb5Mo27Se31.
  • To elucidate the arrangement and bonding of molybdenum-selenium clusters within the material.

Main Methods:

  • Single-crystal X-ray diffraction was used to analyze the crystal structure.
  • Chemical characterization confirmed the stoichiometry of the compound.

Main Results:

  • The crystal structure of Rb5Mo27Se31 was solved, revealing a 1:1 mixture of Mo12Se14Se6 and Mo15Se17Se6 cluster units.
  • These clusters are interconnected by inter-unit molybdenum-selenium bonds.
  • Rubidium cations (Rb+) were observed to occupy large voids within the structure, balancing the charge.

Conclusions:

  • Rb5Mo27Se31 represents a novel complex molybdenum-selenium cluster compound.
  • The interconnected cluster framework and cation placement provide insights into the formation of such materials.

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