Argon fluorohydride
Argon fluorohydride
Other names
Argon hydrofluoride
3D model (JSmol)
  • InChI=1S/ArFH/c1-2/h1H checkY
  • InChI=1/ArFH/c1-2/h1H
  • F[ArH]
Molar mass 59.954 g/mol
Appearance Unknown
Density Unknown
Melting point −256 °C (−428.8 °F; 17.1 K) (decomposes)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Argon fluorohydride (systematically named fluoridohydridoargon) or argon hydrofluoride is an inorganic compound with the chemical formula HArF (also written ArHF). It is a compound of the chemical element argon.


The discovery of this argon compound is credited to a group of Finnish scientists, led by Markku Räsänen.[1] On 24 August 2000, in the journal Nature, they announced their discovery of argon fluorohydride.[2] This discovery caused the recognition that argon could form weakly bound compounds, even though it was not the first.[3]


This chemical was synthesized by mixing argon and hydrogen fluoride on a caesium iodide surface at 8 K (−265 °C), and exposing the mixture to ultraviolet radiation. This caused the gases to combine.

The infrared spectrum of the resulting gas mixture shows that it definitely contains chemical bonds, albeit very weak ones; thus, it is argon fluorohydride, and not a supermolecule or a mixture of argon and hydrogen fluoride. Its chemical bonds are stable only if the substance is kept at temperatures below 27 K (−246 °C); upon warming, it decomposes into argon and hydrogen fluoride.[2]


  1. ^ Räsänen, Markku (17 December 2013). "Argon out of thin air". Nature Chemistry. 6 (1): 82. doi:10.1038/nchem.1825. PMID 24345939.
  2. ^ a b Khriachtchev, Leonid; Mika Pettersson; Nino Runeberg; Jan Lundell; Markku Räsänen (24 August 2000). "A stable argon compound". Nature. 406 (6798): 874–876. Bibcode:2000Natur.406..874K. doi:10.1038/35022551. PMID 10972285. S2CID 4382128.
  3. ^ ""HArF! Argon's not so noble after all – researchers make argon fluorohydride"".

Further reading