| Over the past decades, polyoxometalates (POMs) have attracted large interest because of their impressive compositional diversity and series of potential applications in catalysis, photochemistry, magnetism and electrochemistry. The evolution of POMs chemistry is dependent upon exploring suitable methods to synthesize novel POMs. The evolution of POMs chemistry is dependent upon exploring suitable methods to synthesize novel POMs. In this paper, five new polyoxometalates have been synthesized employing ionothermal and hydrothermal synthesis, and also structurally characterized by elemental analyses, TG-DTA, IR, UV-Vis, , diffuse reflectance UV-vis spectra and single crystal X-ray diffractions. The thermal stabilities and the stabilities in solutions, magnetic properties, electrochemical and electrochemical activities of these compounds have been investigated.Using ionothermal synthetic method with ionic liquid EmimBr (Emim = 1-ethyl-3-methylimidazolium) as solvent has resulted in three novel polyoxometalates (POMs) [Emim]8Na9[WFe9(μ3-O)3(μ2-OH)6O4H2O(SiW9O34)3]·7H2O (1) [EMIM]4[SiW12O40] (2) and [EMIM]6[P2W18O62]·4H2O (3).Three copper-imidazole-containing polyoxometalates (POMs), (HIm)2{[Cu(Im)2(PMo12O40)]}(Im)2·3H2O (4) (Im = imidazole), {[Cu(Im)2](PMo12O40)}[Cu(Im)2]2(Im)·4H2O (5) and {[Cu(Im)2]3(PMoⅤ2MoⅥ10O40}[Cu(Im)3]2 (6), have been hydrothermally synthesized at different pH values. Compound 4, consisting of a Keggin-type polyoxoanion [PMo12O40] decorated by one [Cu(Im)2] complex; Compound 5 is composed of a Keggin-type polyoxoanion [PMo12O40] and three [Cu(Im)2] complexes; compound 6, composed of a Keggin-type polyoxoanion [PMo12O40], three [Cu(Im)2]+ and two [Cu(Im)3]2+ units, was synthesized from the similar reaction system. |
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