Journal of Structural Chemistry

, Volume 48, Issue 4, pp 680–689 | Cite as

Single-crystal structure of Cs2Re6S6Br8 rhenium thiobromide with acentric Re6 octahedral cluster units

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Abstract

Cs2Re6S6Br8 (trigonal, a = 10.001(5) Å, c = 14.676(5) Å) exhibits the same structure as Cs2Mo6Cl8Br6 and Cs2Mo6Br14 that were described in a noncentro-and centrosymmetric space groups, respectively. The structure has been refined in P31c space group from a single crystal of actual composition Cs1.95(1)Re6S5.82(3)Br8.19(3) close to the cesium-rich end of the solid solution Cs2Re6S6Br8 — CsRe6S5Br9. The centrosymmetry is respected by almost all the atoms of the asymmetric unit, but it is clearly broken by significant differences in the S/Br statistical distribution of the disordered “inner” ligands around the Re6 cluster. Structural refinements from data collected at 100 K revealed that the Cs cation disorder is static. From the structure refinements, the stable isomers of the [Re6S6Br2] and [Re6S5Br3] cluster cores have been unambiguously determined.

Keywords

rhenium octahedral cluster structure disorder 
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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  1. 1.Sciences Chimiques de RennesUMR 6226 CNRS-Université de Rennes 1, Equipe CSMRennes CedexFrance
  2. 2.Groupe de Cristallographie et Ingénierie MoléculaireLaboratoire des Multimatériaux et Interfaces, UMR 5615 CNRS-Université Claude Bernard Lyon 1Villeurbanne cedexFrance

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