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Bifluoride

The structure, made by Jamie Manson at the Eastern Washington University, Cheney, US, and colleagues, contains copper ions bound to pyrazine molecules in a planar square. Bifluoride ions (HF2-) sit above and below the copper ions. Each pyrazine molecule can bond to one copper ion at each end, to give a potentially infinite copper-pyrazine plane. Bifluoride ions act as bridges between the planes.

- Ammonium Bifluoride
- Sodium Bifluoride
- Potassium Bifluoride


  Ammonium Bifluoride

Ammonium hydrogen fluoride is a compound formed from ammonium fluoride and hydrogen fluoride, with hydrogen fluoride molecules occupying spaces in the ammonium fluoride crystal lattice. It is the major constituent in glass-etching fluid (though sometimes replaced by potassium hydrogen fluoride), etching occurring due to the fluorination of silicon:
SiO2 (s)+ 4[NH4][HF2] (AG) SiF4 (l) + 4[NH4]F (AG) + 2H2O (l)



  Potassium Bifluoride

Bifluorides are considered toxic although they are not well characterized. Potassium bifluoride is not listed in the TSCA (Toxic Substances Control Act) inventory on the US. They are all considered irritating to the skin and lungs and toxic by inhalation.



  Sodium Bifluoride

Oxygen difluoride was first reported in 1929; it was obtained by the electrolysis of molten potassium fluoride and hydrofluoric acid containing small quantities of water.[2][3] The modern preparation entails the reaction of fluorine with a dilute aqueous solution of sodium hydroxide:
2F2 + 2NaOH OF2 + 2NaF + H2O




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