Fluoroantimonic acid
Synonym(s):Fluoroantimonic acid;Hexafluoroantimonic acid;Hexafluorostibonic acid;Monohydrogen hexafluoroantimonate
- CAS NO.：16950-06-4
- Empirical Formula: F6HSb
- Molecular Weight: 236.76
- MDL number: MFCD00011327
- EINECS: 241-023-8
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-01-13 11:24:35
What is Fluoroantimonic acid?
Description
Fluoroantimonic acid (HSbF6), the strongest known superacid, is made by combining HF with SbF5. It can be as much as 2 × 1019?times stronger than 100% H2SO4. However, superacids are all equally strong in aqueous solution; other solvents must be used to observe their effects.
Chemical properties
superacid; moisture sensitive [KIR78] [ALD94]
Strongest superacid known
mixture of HF and SbF5 (1:1 is strongest)
Protonate even hydrocarbons to afford carbocations and H2.
2×1019 (20 quintillion) times stronger than 100% sulfuric acid.
Ho values of -31.3
The Uses of Fluoroantimonic acid
Hydrogen hexafluoroantimonate(V) is an excellent medium for the preparation of alkylidene oxonium salts.
Preparation
Fluoroantimonic acid is produced by reacting hydrogen fluoride (HF) with antimony pentafluoride (SbF5).
SbF5+HF→SbF6+HF
General Description
HF/SbF5 may be synthesized by mixing hydrogen fluoride and antimony fluoride.1 Fluoroantimonic acid (HF/SbF5), is a combination of SbF5 and HF. It is the known strongest liquid superacid.
Properties of Fluoroantimonic acid
| Melting point: | 20°C |
| Density | 2.885 g/mL at 25 °C(lit.) |
| vapor pressure | 14 mm Hg ( 18 °C) |
| form | liquid |
| color | yellow to colorless |
| Water Solubility | It is fully miscible with water, soluble in SO2ClF, SO2. |
| Exposure limits | ACGIH: TWA 0.5 mg/m3 NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3 |
| CAS DataBase Reference | 16950-06-4(CAS DataBase Reference) |
| EPA Substance Registry System | Antimonate(1-), hexafluoro-, hydrogen, (OC-6-11)- (16950-06-4) |
Safety information for Fluoroantimonic acid
| Signal word | Danger |
| Pictogram(s) |
 Corrosion Corrosives GHS05  Skull and Crossbones Acute Toxicity GHS06  Environment GHS09 |
| GHS Hazard Statements |
H314:Skin corrosion/irritation H411:Hazardous to the aquatic environment, long-term hazard |
| Precautionary Statement Codes |
P260:Do not breathe dust/fume/gas/mist/vapours/spray. P273:Avoid release to the environment. P280:Wear protective gloves/protective clothing/eye protection/face protection. P303+P361+P353:IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for Fluoroantimonic acid
New Products
2-(3-Methyl-1,2,4-oxadiazol-5-yl)acetic acid (as potassium salt) 2-fluoro-4-iodoaniline 4-Iodo-3,5-dimethylbenzonitrile Atorvastatin amide impurity/Atorvastatin EP Impurity F(Calcium Salt) Lantanoprost rc B Clidinium Bromide Impurity Noradrenaline EP Impurity D/Noradrenaline Methyl Ether Cetirizine EP Impurity A/Cetirizine CBHP Impurity N-Nitroso hydroxy Cetrizine EP Impurity-A (4-Fluoro-2-methoxy-5-nitro- phenyl)-[4- (1-methyl-1H- indol-3- yl)-pyrimidin-2-yl]- amine 6-bromo-4-fluoro-1-isopropyl-2-methyl-1H-benzo[d]imidazole tert-butyl 4-(6-((7-cyclo pentyl -6-(dimethyl carbamoyl) -7H-pyrrolo [2,3-d]pyrimidin-2-yl) amino)pyridin-3-yl) piperazine-1-carboxylate 2-Fluoro-4-nitrotoluene 1-(2-amino-5-hydroxy phenyl)propan-1-one (3R,4R)-1-benzyl-N,4-dimethylpiperidin-3- amine 3-(Dimethylamino)benzoic acid 2-Amino-5-chloropyridine 4-(Methylamino)-3-nitrobenzoic Acid 5-Chloro-2-Nitroaniline 3,5-dibenzyloxy Acetophenone 2,4-Diamino-6-hydroxypyrimidine 2-Chloro Benzylcyanide 3-chlorobenzyl cyanide 3,4 Diethoxy BenzylcyanideRelated products of tetrahydrofuran
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