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- W960046503 abstract "Several novel compounds with 1-alkyl-3-methylimidazolium cations (alkyl = butyl and octyl) and first row transition metal-substituted Keggin polyoxoanions were synthesised, having the general formula (cation)m[PW11O39M(H2O)]·xH2O or (cation)m−1H[PW11O39M(H2O)]·xH2O, M = Co, Fe, Mn and m = anion charge. All compounds were characterized by spectroscopic and analytical techniques. These studies indicated that both the polyoxometalates and the cations are present in the solids without major alterations. Cyclic voltammetry studies were performed for compounds with 1-butyl-3-methylimidazolium. Disregarding the loss of crystallization or coordinated water, the compounds were found to be stable up to near 300 °C. The onset of the decomposition of the organic cations, as determined by thermogravimetry, occurred in the 300–350 °C range. The metal-substituted polyoxoanions are stable up to around 300 °C, but after this temperature the anions transform into the parent [PW12O40]3− anion, with loss of the substituting metal. Final decomposition to a mixture of oxides occurred only above 600 °C. It was also possible to obtain the crystalline compounds Na2K(Bmim)2[PW11O39Co(H2O)]·7.5H2O and Na(Bmim)4[PW11O39Co(H2O)]·2H2O and determine their structures by single crystal X-ray diffraction. Compounds with substituted imidazolium cations and metal-substituted polyoxometalates are expected to present a set of properties that make them interesting in many fields, like catalysis. This study aimed at contributing to the understanding the effect of altering the substituting metal and the counter-cation in the properties of this type of compounds." @default.
- W960046503 created "2016-06-24" @default.
- W960046503 creator A5023129111 @default.
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- W960046503 creator A5029250882 @default.
- W960046503 creator A5065014659 @default.
- W960046503 creator A5087293411 @default.
- W960046503 date "2015-11-01" @default.
- W960046503 modified "2023-10-17" @default.
- W960046503 title "Synthesis and properties of new materials with cobalt(II), iron(III) and manganese(III)-substituted Keggin polyoxotungstates and 1-alkyl-3-methylimidazolium cations" @default.
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- W960046503 doi "https://doi.org/10.1016/j.poly.2015.07.032" @default.
- W960046503 hasPublicationYear "2015" @default.
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