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• W2066163359 abstract "Solutions of SbF 5 in HSO 3 F with x SbF5 = 0.012 to 0.405 are studied by 500 MHz 1 H NMR (299 K) and 471 MHz 19 F NMR (213–250 K), using NMR tubes fitted with fluoropolymer lining. The initial process during dissolution is the fast solvolysis of monomeric SbF 5 in HSO 3 F according to SbF 5 + nHSO 3 F [Formula: see text] SbF 5 – n (SO 3 F) n + nHF (n = 1, 2). All HF formed during solvolysis will no longer be removed by reaction with glass, but will remain in the superacid system. Besides participation in the fast formation of various fluoro-fluorosulfato anions [SbF 6 – n (SO 3 F) n ] – (n = 0, 1, 2) and acidium ions [H 2 X] + (solv.) (X= F, SO 3 F), HF is involved in slow-exchange reactions of the type [SbF 6 – n (SO 3 F) n ] – (solv.) + HF [Formula: see text] [SbF 7 – n (SO 3 F) n – 1 ] – (solv.) + HSO 3 F (n = 1, 2) detected because of a delay of 3 months between sample preparation and measurements and confirmed by repeating theses measurements after a further 3 months. There are three notable differences to our earlier study, affecting concentrations of the fluoro-fluorosulfato antimonate anions observed: (i) in dilute solutions [SbF 6 ] – is formed in high concentrations (34.7–76.1%), with [Sb 2 F 11 ] – now clearly detected at intermediate to high SbF 5 concentrations (up to 5.8%); (ii) bis-fluorosulfato anions (cis-, trans-[SbF 4 (SO 3 F) 2 ] – ) are found in much lower concentrations only, which decrease further with time, while tris-fluorosulfato anions ([SbF 3 (SO 3 F) 3 ] – ) are now no longer observed; (iii) these reduced concentrations of poly-fluorosulfato anions in dilute solutions are responsible for the formation of fewer µ-SO 3 F-oligomers at lower concentrations, when more SbF 5 is added. As a consequence, the HSO 3 F–SbF 5 magic acid system is now less complex than found previously and only seven anionic species are clearly observed. Key words: superacids, antimony(V) fluoroanions, 1 H NMR, 19 F NMR, solvolysis." @default.
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• W2066163359 date "2002-09-01" @default.
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• W2066163359 title "A ¹⁹F nuclear magnetic resonance study of the conjugate Brønsted–Lewis superacid HSO₃F–SbF₅. Part II." @default.
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• W2066163359 doi "https://doi.org/10.1139/v02-139" @default.
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