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Ammonium Bifluoride
Introduction
Ammonium hydrogen fluoride, NH4HF2, is a chemical compound which can be produced from ammonia and hydrogen fluoride. It is the major constituent in glass-etching fluid (though sometimes replaced by potassium hydrogen fluoride), etching occurring due to the fluorination of silicon:
The structure of [NH4][HF2] contains tetrahedral [NH4]+ cations and linear [HF2]− anions. Each cation is surrounded by four fluorine atoms in a tetrahedron, with hydrogen – fluorine hydrogen bonds present between the hydrogen atoms of the ammonium ion and the fluorine atoms.
References
- A. F. Wells, Structural Inorganic Chemistry, 5th ed., Oxford University Press, Oxford, UK, 1984.
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ar:ثنائي فلوريد أمونيوم هيدروجين de:Ammoniumhydrogendifluorid