From Discrete Metal-Oxygen Clusters to Open-Framework Structure: Syntheses and Characterization of Cs2Mo2O5As2O7·H2O, Cs2
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- 作者：Kuei-Fang Hsu and Sue-Lein Wang
- 刊名：Inorganic Chemistry
- 出版年：1998
- 出版时间：June 29, 1998
- 年：1998
- 卷：37
- 期：13
- 页码：3230 - 3235
- 全文大小：348K
- 年卷期：v.37,no.13(June 29, 1998)
- ISSN：1520-510X
文摘
Three new molybdenum(VI) arsenate hydrates,Cs2Mo2O5As2O7·H2O(1),Cs2Mo2O5(HAsO4)2·H2O(2), and Cs4Mo6O18(H2O)(HAsO4)2·2.5H2O(3), have been prepared and structurally characterized bysingle-crystal X-raydiffraction, thermal analysis, and IR spectroscopy. Crystaldata: 1, monoclinic,P21/c a = 7.9783(5)Å, b =10.7837(6) Å, c = 15.5213(9) Å, 
=93.594(1)
, and Z = 4; 2, triclinic,P
, a = 7.8165(2) Å, b= 9.8902(3)Å, c = 11.0401(3) Å, 
= 63.814(1), = 70.475(1), 
= 72.655(1), Z = 2;3, monoclinic, P21/n,a = 8.0345(1) Å, b = 20.0364(4) Å, c =19.5941(3) Å, = 92.296(1), Z = 4.Crystal 1 adopts an open frameworkstructure which contains vertex-sharing bioctahedralMo2O11 units linked byAs2O74- groups toform intersectingtunnels where Cs+ cations and water molecules reside.Crystals 2 and 3 are composed of thediscrete clusteranions,[Mo4O10(HAsO4)4]4-and[Mo6O18(H2O)(HAsO4)2]4-,respectively. These anions are held in space viathe interactions with Cs+ cations and hydrogen bonds.Thermal studies showed both crystals 2 and 3are transformedinto 1 upon prolonged heating. It exhibits the firstexperimental evidence that a metal diarsenate frameworkcanbe converted thermally from hydrogen arsenate-containing polyanions.The three compounds are the first membersprepared in the Cs/MoVI/AsV/Osystem.
=93.594(1), and Z = 4; 2, triclinic,P, a = 7.8165(2) Å, b= 9.8902(3)Å, c = 11.0401(3) Å, = 63.814(1), = 70.475(1), = 72.655(1), Z = 2;3, monoclinic, P21/n,a = 8.0345(1) Å, b = 20.0364(4) Å, c =19.5941(3) Å, = 92.296(1), Z = 4.Crystal 1 adopts an open frameworkstructure which contains vertex-sharing bioctahedralMo2O11 units linked byAs2O74- groups toform intersectingtunnels where Cs+ cations and water molecules reside.Crystals 2 and 3 are composed of thediscrete clusteranions,[Mo4O10(HAsO4)4]4-and[Mo6O18(H2O)(HAsO4)2]4-,respectively. These anions are held in space viathe interactions with Cs+ cations and hydrogen bonds.Thermal studies showed both crystals 2 and 3are transformedinto 1 upon prolonged heating. It exhibits the firstexperimental evidence that a metal diarsenate frameworkcanbe converted thermally from hydrogen arsenate-containing polyanions.The three compounds are the first membersprepared in the Cs/MoVI/AsV/Osystem.