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- W2092154704 abstract "Previously, a model for aluminium(III) phosphate complexation in 3 M (Na)ClO4 aqueous solution at 25 °C has been proposed, on the basis of potentiometric titration data, in which there are eleven phosphorus-containing species. Support for this model is provided by the assignment to these species of eight peaks in 31P NMR spectra obtained, under the same conditions of temperature and ionic strength, from a set of Al(ClO4)3–H3PO4–NaH2PO4 solutions. The assignment was made by correlating fractional NMR peak areas with fractional complex concentrations calculated using the potentiometric data model. The chemical shift in the range 0.3–0.91 ppm is assigned to H3PO4, H2PO4-, H6(PO4)2, H5(PO4)2-, and in part to Al3H-8(H3PO4)5+andAl3H-6(H3PO4)43+, in fast proton exchange. The peaks at −6.8, −7.4 and −12.4 ppm are assigned to isomers of Al(H2PO4)2+. The signal at −7.4 is also due to AlH2PO42+. Polynuclear complexes have been assigned as follows. Al3H-5(H3PO4)24+ −11.5, Al3H-6(H3PO4)43+ −11.7, Al3H-8(H3PO4)5+ −12.3 and Al3H-6(H3PO4)43+ −16.8 ppm. A further four peaks were observed but could not be assigned. All chemical shifts are relative to 85% phosphoric acid as external reference." @default.
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- W2092154704 date "2005-10-01" @default.
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- W2092154704 title "Phosphorus-31 nuclear magnetic resonance study of aluminium(III) ortho-phosphate complexes in aqueous solution" @default.
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- W2092154704 doi "https://doi.org/10.1016/j.poly.2005.06.004" @default.
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