29171-24-2

Usage

InChI:InChI=1/FHO3S/c1-5(2,3)4/h(H,2,3,4)/i/hD

Upstream product

• 7789-21-1 fluorosulphonic acid 
• 13813-19-9 sulfuric acid-d2 
• 7446-11-9 sulfur trioxide 
• 14333-26-7 hydrogen fluoride 

Relevant academic research and scientific papers

The protiotetramethylammonium dication (CH3)3NCH42+: Hydrogen/deuterium exchange and calculational studies. Search for the parent protioammonium dication NH52+

The protonation of ammonium ions NR4+ (R = H, CH3) to form the corresponding protioammonium dications HNR42+ (R = H, CH3) was investigated by hydrogen/deuterium exchange experiments and by ab initio molecular orbital calculations. Hydrogen/deuterium exchange was observed by 2H NMR spectroscopy at the CH3 groups of tetramethylammonium ion N(CH3)4+ when reacted with excess DF:SbF5 superacid. On the basis of calculational results, the intermediacy of the corresponding C-H-protonated protiotetramethylammonium dication (CH3)3NCH42+ is suggested to account for the observed exchange. Under similar conditions, no exchange was observed in the parent ammonium ion NH4+ in FSO3D:SbF5 superacid, although the NH52+ dication was calculated to be kinetically stable with a considerable barrier to deprotonation. The pentafluoroammonium dication NF52+ was also investigated theoretically, and the results were compared to those of neutral NF5.

H/D isotope exchange between methane and magic acid (HSO 3F-SbF5): An in situ NMR study

The kinetics of hydron exchange between methane and a series of DSO 3F-SbF5 superacids were measured by in situ 2H decoupled 1H NMR spectroscopy. The rates of exchange showed a strong dependence on antimony pentafluoride concentration, with the free energy of activation ΔG# (30°C) decreasing from 97 to 84 kJ mol -1 over the range of concentration 19 to 49 mol % SbF5. The constant free enthalpy of activation ΔH# (ca. 65 kJ mol-1) and the decreasing entropy of activation ΔS# seem to indicate that an increase in acidity of the superacid system does not substantially change the nature of the transition state but rather acts on its solvation.