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arsenic trifluoride
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Arsenic trifluoride is a chemical compound of arsenic and fluorine with the chemical formula AsF3. It is a colorless liquid which reacts readily with water.
==Preparation and properties==
It can be prepared by reacting hydrogen fluoride, HF, with arsenic trioxide:〔
:6HF + As2O3 → 2AsF3 + 3H2O
It has a pyramidal molecular structure in the gas phase which is also present in the solid.〔 In the gas phase the As-F bond length is 170.6 pm and the F-As-F bond angle 96.2°.〔Wells A.F. (1984) ''Structural Inorganic Chemistry'' 5th edition Oxford Science Publications ISBN 0-19-855370-6〕
Arsenic trifluoride is used as fluorinating non-metal chlorides to fluorides, in this respect it is less reactive than SbF3.〔
Salts containing AsF4− anion can be prepared for example CsAsF4.〔New alkali metal and tetramethylammonium tetrafluoroarsenates(III), their vibrational spectra and crystal structure of cesium tetrafluoroarsenate(III)Klampfer P, Benkič P, Lesar A, Volavšek B, Ponikvar M , Jesih A., Collect. Czech. Chem. Commun. 2004, 69, 339-350 〕 the potassium salt KAs2F7 prepared from KF and AsF3 contains AsF4− and AsF3 molecules with evidence of interaction between the AsF3 molecule and the anion.〔Alkali-metal heptafluorodiarsenates(III): their preparation and the crystal structure of the potassium salt, Edwards A.J., Patel S.N., J. Chem. Soc., Dalton Trans., 1980, 1630-1632, 〕
With SbF5 the ionic adduct AsF2+ SbF6− is produced 〔Fluoride crystal structures. Part XV. Arsenic trifluoride–antimony pentafluoride, Edwards A. J., Sills R. J. C. J. Chem. Soc. A, 1971, 942 - 945, 〕
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