From Discrete Metal-Oxygen Clusters to Open-Framework Structure: Syntheses and Characterization of Cs2Mo2O5As2O 7·H2O, Cs2Mo2O5(HAsO4) 2·H2O, and

Kuei-Fang Hsu, Sue Lein Wang

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Three new molybdenum(VT) arsenate hydrates, Cs2Mo2O5As2O 7·H2O (1), Cs2Mo2O5(HAsO4) 2·H2O (2), and Cs4-Mo6O18(H2O)(HAsO 4)2·2.5H2O (3), have been prepared and structurally characterized by single-crystal X-ray diffraction, thermal analysis, and IR spectroscopy. Crystal data: 1, monoclinic, P21/c a = 7.9783(5) Å, b = 10.7837(6) Å, c = 15.5213(9) Å, β = 93.594(1)°, and Z = 4; 2, triclinic, P1̄, a = 7.8165(2) Å, b = 9.8902(3) Å, c = 11.0401(3) Å, α = 63.814(1)°, β = 70.475(1)°, γ = 72.655(1)°, Z = 2; 3, monoclinic, P21/n, a = 8.0345-(1) Å, b = 20.0364(4) Å, c = 19.5941(3) Å, β = 92.296(1)°, Z = 4. Crystal 1 adopts an open framework structure which contains vertex-sharing bioctahedral Mo2O11 units linked by As2O74- groups to form intersecting tunnels where Cs+ cations and water molecules reside. Crystals 2 and 3 are composed of the discrete cluster anions, [Mo4O10(HAsO4)4]4- and [Mo6O18(H2O)(HAsO4) 2]4-, respectively. These anions are held in space via the interactions with Cs+ cations and hydrogen bonds. Thermal studies showed both crystals 2 and 3 are transformed into 1 upon prolonged heating. It exhibits the first experimental evidence that a metal diarsenate framework can be converted thermally from hydrogen arsenate-containing polyanions. The three compounds are the first members prepared in the Cs/MoVI/AsV/O system.

Original languageEnglish
Pages (from-to)3230-3235
Number of pages6
JournalInorganic Chemistry
Issue number13
Publication statusPublished - 1998 Dec 1

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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