Argon fluorohydride

Structural formula
General
Surname	Argon fluorohydride
other names	Argon hydrogen fluoride
Molecular formula	HArF
External identifiers / databases
CAS number 163731-16-6 Wikidata Q411407
properties
Molar mass	59.954 g mol −1
Melting point	−246 ° C (decomposition)
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Argon fluorohydride is the only known and experimentally proven chemical compound of the noble gas argon . It is very unstable and decomposes at temperatures above 27  K (−246.15 ° C) to form hydrogen fluoride and elemental argon.

history

Argon fluorohydride was first discovered in 2000 by a group led by the Finnish chemist Markku Räsänen at the University of Helsinki .

Extraction and presentation

In order to synthesize argon fluorohydride, hydrogen fluoride was first frozen in an argon matrix on a cesium iodide surface at 7.5 K. This was treated with a Krypton - gas discharge lamp at wavelengths irradiated nm 127-160. Some of the hydrogen fluoride dissociated and formed argon fluorohydride.

properties

Argon fluorohydride is very unstable. When heated, it decomposes at temperatures from 27 K and under UV radiation at wavelengths of 350 to 400 nm.

According to theoretical calculations, the argon fluorohydride molecule has bond lengths of 133 pm for the H-Ar and 197 pm for the Ar-F bond and a dipole moment of 6.51  D .

proof

The compound could be detected via characteristic bands in the IR spectrum at 435.7, 687 and 1969.5 cm ⁻¹ , which did not exist before the reaction .

Individual evidence

1. ↑ ^{a b c d e f} Leonid Khriachtchev, Mika Pettersson, Nino Runeberg, Jan Lundell, Markku Räsänen: A stable argon compound. In: Nature. 2000, 406, pp. 874-876, doi : 10.1038 / 35022551 .
2. ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.