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| fluoroantimonic acid | |
|---|---|
| Name | Fluoroantimonic acid |
| Other names | Hydrogen hexafluoroantimonate(V), HSbF6·HF (approximate), magic acid family |
| Formula | HF·SbF5 (stoichiometric representation) |
| Appearance | Colorless to pale yellow liquid (in solutions) |
| Density | Variable with composition |
| Molar mass | Variable |
| Solubility | Miscible with strong Lewis acids; reacts with water |
fluoroantimonic acid Fluoroantimonic acid is an extremely strong superacid formed by combining hydrogen fluoride with antimony(V) fluoride to give solutions containing the hexafluoroantimonate anion. Developed in the mid-20th century, it is noted for protonating species that resist protonation under typical conditions, and for its historical role in superacid chemistry and investigations related to carbocation stabilization and organic reaction mechanisms. The substance is handled primarily in specialized laboratories at institutions such as Bell Labs, DuPont, and university research groups working in University of Cambridge and Harvard University-style programs.
Commercial and experimental descriptions represent fluoroantimonic acid as a mixture of hydrogen fluoride and antimony pentafluoride that yields solvated protonic species and the weakly coordinating hexafluoroantimonate anion. Nomenclature in IUPAC-derived literature references hydrogen hexafluoroantimonate(V) when describing isolated salts, while historical reports from researchers at Georgetown University and Princeton University describe formulations using HF·SbF5 ratios. Systematic names appear alongside trivial names in publications from Royal Society of Chemistry and American Chemical Society journals.
Typical laboratory synthesis combines anhydrous hydrogen fluoride with antimony pentafluoride under strictly anhydrous, inert conditions in apparatus frequently sourced from manufacturers such as Swagelok and handled in gloveboxes associated with facilities like Lawrence Berkeley National Laboratory. Early synthetic work was reported by researchers at Stanford University and Brookhaven National Laboratory, and methods appear in theses from Massachusetts Institute of Technology groups. Scale-up and industrial handling protocols reference standards from Occupational Safety and Health Administration and practices adopted by chemical companies such as BASF and 3M for corrosive agents.
Solutions display properties recorded by spectroscopy performed at institutions like Max Planck Society laboratories and synchrotron facilities such as European Synchrotron Radiation Facility. Spectroscopic signatures in NMR spectroscopy and IR spectroscopy correlate with protonated substrates and the SbF6^- anion, with data reported in journals backed by Nature Publishing Group and Science publishers. Thermochemical values and phase behavior have been compared to related superacids studied at Los Alamos National Laboratory and Argonne National Laboratory.
Fluoroantimonic acid is among the strongest known Brønsted acids, often benchmarked against other superacids from work by chemists at Du Pont de Nemours, ExxonMobil Research, and academic groups at University of California, Berkeley. It protonates hydrocarbons leading to stable carbocation intermediates, a phenomenon explored in landmark studies at Bell Labs and described in reviews by the American Chemical Society Division of Organic Chemistry. Comparative acidity scales in publications from Royal Society of Chemistry place fluoroantimonic acid above triflic acid and magic acid, and mechanistic insight has been advanced by researchers affiliated with Columbia University and Yale University.
Handling protocols follow guidance similar to that established by Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, and institutional safety offices at Johns Hopkins University and University of Chicago. Storage requires corrosion-resistant materials supplied by companies such as Parker Hannifin and specialized containment systems used at Oak Ridge National Laboratory. Emergency response procedures reference standards promulgated by Federal Emergency Management Agency and training used by American Red Cross-affiliated programs. Personal protective equipment and neutralization strategies are developed in coordination with safety divisions at Pfizer and GlaxoSmithKline for research-scale work.
Research applications include generation of stable carbocations and exploration of protonation in organic synthesis studies conducted at University of Oxford and ETH Zurich, facilitation of isomerization and alkylation reactions investigated by industrial chemists at Shell and Chevron, and use in mechanistic probes by groups at University of Illinois Urbana–Champaign and California Institute of Technology. Historical and pedagogical demonstrations have been presented at conferences organized by American Chemical Society and International Union of Pure and Applied Chemistry panels.
Due to its extreme corrosivity and reactivity with water, environmental release scenarios are addressed in environmental impact assessments guided by agencies such as the Environmental Protection Agency and international frameworks like the Stockholm Convention for hazardous substances. Health implications for exposures are consistent with chemical hazards documented by World Health Organization advisories and occupational medicine programs at Mayo Clinic and Cleveland Clinic. Disposal and decontamination practices are coordinated with regional hazardous waste authorities including European Chemicals Agency and municipal hazardous waste services in cities such as New York City.
Category:Superacids