P NMR and Raman spectroscopic and voltammetric studies on the formation and conversion processes of Keggin-type molybdotungstophosphate(V) and -arsenate(V) complexes in aqueous-organic solvents |
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Authors: | Tadaharu Ueda Takashi Toya Masashi Hojo |
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Affiliation: | Department of Material Science, Faculty of Science, Kochi University, Akebono-cho 2-5-1, Kochi 780-8520, Japan |
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Abstract: | The formation conditions of Keggin-type molybdotungstophosphate(V) (PWxMo12 − xO40 3− (PWxMo12 − x), x=0-12) and -arsenate(V) (AsWxMo12 − xO40 3− (AsWxMo12 − x)) complexes in aqueous-organic solvents were investigated with 31P NMR, Raman spectroscopy, and cyclic voltammetry. The conversion processes of the PMo12 and the PW12 anions into the PWxMo12 − x anions were also examined and compared with those of the AsMo12 and AsW12 anions into the AsWxMo12 − x anions. The mean vibration frequencies of the PWxMo12 − x and AsWxMo12 − x (x=1-11) complexes were calculated in IR and Raman spectra from those of the PMo12 and PW12, and AsMo12 and AsW12 complexes, respectively. |
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Keywords: | Polyoxometalates Keggin Organic solvents 31P NMR Raman spectroscopy Cyclic voltammetry |
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