{Mo2O2S2}2+-directed synthesis of a polyoxotungstoarsenate(III). Structure and 183W NMR studies of the [(¦Á-AsW9O33)3(WO(OH2))3(Mo2O
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- 作者：Marie-Anne Pilette ; Jé ; rô ; me Marrot ; Sylvain Duval ; Fatma Bannani ; Sé ; bastien Floquet ; Francis Sé ; cheresse ; Emmanuel Cadot ; cadot@chimie.uvsq.fr
- 关键词：Polyoxometalates ; NMR spectroscopy ; X-ray diffraction ; Tungsten ; Sulfur
- 刊名：Comptes Rendus Chimie
- 出版年：2012
- 出版时间：February-March 2012
- 年：2012
- 卷：15
- 期：2-3
- 页码：124-129
- 全文大小：541 K
文摘
Reaction of the [Mo2O2S2(OH2)6]2+ aqua cation and [WO4]2?/sup> with the trivacant ion [¦Á-B-AsW9O33]9?/sup> in acidic condition (pH = 1.4) leads to the formation of a {Mo2S2O2}-supported polyoxotungstate. The mixed salt NMe4K12[(¦Á-AsW9O33)3(WO(OH2))3(Mo2O2S2(H2O)4)]?0H2O (noted TMAK12-1) has been obtained as single crystals and structurally characterized by X-ray diffraction analysis. The structural analysis of TMAK12-1 reveals a molecular polyoxotungsto-arsenate (III) framework consisting of three ¦Á-{AsW9O33} subunits mutually linked by three {O = W-OH2}4+ groups. The resulting triangular arrangement delimits a large ¡°open-space? lined on the periphery by six terminal oxygen atoms. The central cavity is partially filled by a single {Mo2O2S2(OH2)4}2+ which spans two {AsW9O33} subunits. Furthermore, three potassium ions have been located, one being embedded within the central cavity and the other two, symmetrically distributed at the periphery of the central cavity. In the solid state, two anions 1 interact through hydrogen bonds and ionic contacts to give a large dimeric arrangement bordered by two TMA+ cations. 1 has been characterized in solution (Li+ salt) by its 183W NMR spectrum which contains 16 lines in agreement with the Cs idealized symmetry assumed for the isolated anion 1. Infrared data and elemental analysis are also supplied.