Chemistry in super acids. II. Nuclear magnetic resonance and laser Raman spectroscopic study of the antimony pentafluoride-fluorosulfuric acid (sulfur dioxide) solvent system (magic acid). The effect of added halides, water, alcohols, and carboxylic acids. Study of the hydronium ion

1969 ◽  
Vol 91 (11) ◽  
pp. 2929-2942 ◽  
Author(s):  
Auguste Commeyras ◽  
George A. Olah
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Sulfur Dioxide ◽  
Spectroscopic Study ◽  
Solvent System ◽  
Antimony Pentafluoride ◽  
Raman Spectroscopic ◽  
Laser Raman ◽  
Raman Spectroscopic Study ◽  
Hydronium Ion

A 19F Nuclear Magnetic Resonance and Raman Spectroscopic Study of Complex Formation between Antimony Pentafluoride and the Pentafluorides of Niobium and Tantalum

1971 ◽  
Vol 49 (10) ◽  
pp. 1736-1746 ◽  
Author(s):  
P. A. W. Dean ◽  
R. J. Gillespie
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Raman Spectrum ◽  
Magnetic Resonance ◽  
Antimony Pentafluoride ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Unusual Distribution ◽  
Liquid Systems ◽  
Mixed Transition ◽  
Nuclear Magnetic

The low temperature 19F nuclear magnetic resonance (n.m.r.) spectra of NbF5–SbF5–SO2ClF and TaF5–SbF5–SO2ClF systems appear to indicate ionization of the pentafluorides to form niobium (tantalum) fluorocations and antimony polyfluoroanions, but the solutions show an unusual distribution of species and have very low conductivities. It is concluded that neutral "fluxional" MF4–SbnF5n+1 molecules are formed. The 19F n.m.r. spectra and conductivities of the liquid systems NbF5–SbF5 and TaF5–SbF5 are consistent with the formation of neutral fluorine-bridged polymers with mixed transition metal and antimony units. These polymers may be "fluxional" on the n.m.r. time scale. The Raman spectra of the liquid systems and the crystalline pentafluoride mixtures show that both contain mixed cis fluorine-bridged units. The Raman spectrum of crystalline SbF5 and the 19F n.m.r. spectrum of the NbSbF11− ion are reported.

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