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| | Fluoroantimonic acid Basic information |
| | Fluoroantimonic acid Chemical Properties |
| 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 | | InChI | 1S/6FH.Sb/h6*1H;/q;;;;;;+5/p-5 | | InChIKey | MBAKFIZHTUAVJN-UHFFFAOYSA-I | | SMILES | F.F[Sb](F)(F)(F)F | | CAS DataBase Reference | 16950-06-4(CAS DataBase Reference) | | EPA Substance Registry System | Antimonate(1-), hexafluoro-, hydrogen, (OC-6-11)- (16950-06-4) |
| Hazard Codes | Xn,N,C,T+ | | Risk Statements | 20/22-51/53-35-26/27/28 | | Safety Statements | 61-45-36/37/39-28-26 | | RIDADR | UN 2922 8/PG 2 | | WGK Germany | 2 | | Hazard Note | Corrosive | | TSCA | TSCA listed | | HazardClass | 8 | | PackingGroup | II | | Storage Class | 6.1A - Combustible acute toxic Cat. 1 and 2
very toxic hazardous materials | | Hazard Classifications | Acute Tox. 1 Dermal
Acute Tox. 2 Inhalation
Acute Tox. 2 Oral
Aquatic Chronic 2
Eye Dam. 1
Skin Corr. 1A |
| | Fluoroantimonic acid Usage And Synthesis |
| 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 | | Uses | Fluoroantimonic acid 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. | | Materials Uses | Researchers selected poly(9,9-dioctylfluorene-alt-N-(4-secbutylphenyl)-diphenylamine) (TFB), a benchmark HTL material used in QLEDs, in combination with SU-8, a widely used negative photoresist. The TFB layer undergoes chemical degradation during the exposure process due to reactions with fluoroantimonic acid (HSbF6) released by the photoacid generator (PAG) in the SU-8 photoresist. HSbF6, one of the strongest known inorganic acids, is an essential component in SU-8 for initiating polymerization by protonating epoxide groups in resin monomers during post-baking. However, its extreme acidity can corrode the TFB layer[3]. | | References |
[1] J. OLAH G. O. Synthetic Method and Reactions; V. 1 Fluoroantimonic Acid, a Convenient Superacid Catalyst for the Improved Isomerization of Tetrahydrodicyclopentadiene to Adamantane[J]. Synthesis-Stuttgart, 2002, 106 1: 488-488. DOI:10.1055/S-1973-22239.
[2] ZENGSHE LIU Atanu B. Fluoroantimonic acid hexahydrate (HSbF6·6H2O) catalysis: The ring-opening polymerization of epoxidized soybean oil[J]. Applied Catalysis A: General, 2013, 453: Pages 370-375. DOI:10.1016/j.apcata.2012.12.028.
[3] Wang, C., He, S., Liu, Y., Sun, Y., Peng, F., Zhu, X., Jin, W., Chen, D., Ying, L., Hao, Y., Li, H., & Jin, Y. (2025). High-resolution and high-efficiency micro quantum-dot light-emitting diode arrays via conventional photolithography. Nano Research, 18(9), 94907407. https://doi.org/10.26599/nr.2025.94907407
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| | Fluoroantimonic acid Preparation Products And Raw materials |
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