Synthesis, characterization of magnesium-substituted tungstoarsenate [As2W15Mg3O62]18-, and its electrochromism

摘要: Abstract The novel, magnesium-substituted tungstoarsenate, [As2W15Mg3O62]18− (As2W15Mg3) (1) has been synthesized from the lacunary precursor [As2W15O56]12− and characterized by elemental analysis, IR, UV 183W NMR spectroscopy. spectrum of 1 exhibits three lines 1:2:2 intensity at −141.17, −147.86 −183.02 ppm, as expected for C3v structure tri-substituted α-Dawson anion. electrochemical behavior in aqueous solution investigated. compound successive reduction processes W atoms a negative potential range. As2W15Mg3-containing monolayer multilayer films have fabricated on ITO substrate with poly(diallyldimethylammonium) chloride (PDDA) layer-by-layer deposition. Thus-prepared were cyclic voltammetry (CV), UV–vis spectroscopy X-ray photoelectron (XPS). shows reversible two-electron redox waves acidic range 0.4 to −0.7 V, which are same that solutions. electrochromic studied situ CV–UV–visible spectroelectrochemical methods, indicating show suitable response times good reproducibility response. This study provides new explore possibility application electrochromism material.