@article {425,
	title = {A F-19 nuclear magnetic resonance study of the conjugate Bronsted-Lewis superacid HSO3F-SbF5. Part II},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {80},
	number = {9},
	year = {2002},
	note = {ISI Document Delivery No.: 607YFTimes Cited: 4Cited Reference Count: 31},
	month = {Sep},
	pages = {1265-1277},
	type = {Article},
	abstract = {Solutions of SbF5 in HSO3F with x(SbF5) = 0.012 to 0.405 are studied by 500 MHz H-1 NMR (299 K) and 471 MHz F-19 NMR (213-250 K), using NMR tubes fitted with fluoropolymer lining. The initial process during dissolution is the fast solvolysis of monomeric SbF5 in HSO3F according to SbF5 + nHSO(3)F left arrow SbF5 - n(SO3F)(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 [SbF6 - n(SO3F)(n)](-) (n = 0, 1, 2) and acidium ions [H2X](+)((solv.)) (X= F, SO3F), HF is involved in slow-exchange reactions of the type [SbF6 - n(SO3F)(n)](-)((solv.)) + HF left arrow [SbF7 - n(SO3F)(n- 1)](-)((solv.)) + HSO3F (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 [SbF6](-) is formed in high concentrations (34.7-76.1\%), with [Sb2F11](-) now clearly detected at intermediate to high SbF5 concentrations (up to 5.8\%); (ii) bis-fluorosulfato anions (cis-, trans-[SbF4(SO3F)(2)](-)) are found in much lower concentrations only, which decrease further with time, while tris-fluorosulfato anions ([SbF3(SO3F)(3)](-)) are now no longer observed; (iii) these reduced concentrations of poly-fluorosulfato anions in dilute solutions are responsible for the formation of fewer mu-SO3F-oligomers at lower concentrations, when more SbF5 is added. As a consequence, the HSO3F-SbF5 magic acid system is now less complex than found previously and only seven anionic species are clearly observed.},
	keywords = {ANTIMONY PENTAFLUORIDE, antimony(V) fluoroanions, F-19 NMR, H-1 NMR, HF-SBF5, MEDIA, RELATIVE ACIDITY, SBF5, solvolysis, superacids, SYSTEMS},
	isbn = {0008-4042},
	url = {<Go to ISI>://000178817800011},
	author = {Kuhn-Velten, J. and Bodenbinder, M. and Brochler, R. and Hagele, G. and Aubke, F.}
}
@article {4713,
	title = {A F-19 nuclear magnetic resonance study of the conjugate Bronsted-Lewis superacid HSO3F-SbF5. Part 1},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {77},
	number = {11},
	year = {1999},
	note = {ISI Document Delivery No.: 253FETimes Cited: 5Cited Reference Count: 32},
	month = {Nov},
	pages = {1869-1886},
	type = {Article},
	abstract = {The Bronsted-Lewis superacid HSO3F-SbF5 or "magic acid" is re-investigated by modern F-19 NMR methods over a wide concentration range. The system is found to be considerably more complex than had been assumed previously. A,total of 13 different anions are identified of which only five have previously been identified in magic acid. With increasing SbF5 contents the concentration of monomeric anions like [SbF6](-), [SbF5(SO3F)](-), cis- and trans-[SbF4(SO3F)(2)](-), and mer-[SbF3(SO3F)(3)](-) gradually decreases. Except for [Sb2F11](-), which is present in very small concentrations only the formation of oligomers involves exclusively mu-fluorosulfato bridges. In addition to donor (SO3F)(-) and acceptor (SbF5) complex formation to give [SbF5(SO3F)](-) and possibly ligand redistribution, the solvolysis of SbF5 or SbF4(SO3F) in HSO3F appears to be the principal formation reaction for polyfluorosulfatofluoroantimonate(V) anions. In glass (NMR tubes) the solvolysis product HF is converted to the oxonium ion [H3O](+), which has previously been identified by H-1 NMR and structurally characterized as [H3O][Sb2F11] by us.},
	keywords = {ANTIMONY PENTAFLUORIDE, conjugate superacid, F-19 NMR spectra, FLUOROSULFATE, fluorosulfuric acid, HF-SBF5, magic acid, MEDIA, RELATIVE ACIDITY, SBF5, SYSTEMS},
	isbn = {0008-4042},
	url = {<Go to ISI>://000083545300020},
	author = {Zhang, D. L. and Heubes, M. and Hagele, G. and Aubke, F.}
}
