Abstract
Interaction of arsenite ions with molybdate ions in aqueous HClO4 at pH of 3–5 were studied using spectrophotometry. A heteropoly anion (HPA) with the AsMo4 stoichiometry was revealed. Elemental analysis, X-ray photoelectron spectroscopy, and IR spectroscopy were used to characterize the composition and structure of the cesium salt of As(III)-Mo(VI) HPA precipitated from solution. The comparison of the IR spectra of cesium salts of the synthesized HPA and dimethylarsenite HPA (CH3)2AsMo4O15H2−, whose structure is known, implies that AsMo4O153− has a similar structure, where the AsO2− group is linked by four connected molybdenum octahedra (Mo4O12)O2−.
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