Sulfur difluoride

Structural formula
General
Surname	Sulfur difluoride
other names	Monosulfur difluoride Difluorosulfane
Molecular formula	SF 2
Brief description	colorless gas
External identifiers / databases
CAS number 13814-25-0 PubChem 139605 Wikidata Q553164
properties
Molar mass	70.06 g mol −1
Physical state	gaseous
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 .

Sulfur difluoride is a chemical compound from the group of fluorides .

Extraction and presentation

Sulfur difluoride can be obtained by halogen exchange during the reaction of sulfur dichloride with potassium fluoride (170 ° C) or mercury (II) fluoride (150 ° C) or silver (I) fluoride (20 ° C) at pressures <25 mbar, whereby also other sulfur fluorides are formed.

${\displaystyle \mathrm {SCl_{2}+2\ KF\longrightarrow SF_{2}+2KCl} }$

${\displaystyle \mathrm {SCl_{2}+HgF_{2}\longrightarrow SF_{2}+HgCl_{2}} }$

It is also possible to produce it by reacting carbonyl sulfide with fluorine .

properties

Bond lengths and angles of sulfur difluoride

Sulfur difluoride is a colorless gas that exists as a monomer (SF ₂ ) as well as a dimer disulfur tetrafluoride and trimer trisulfur hexafluoride. It is only stable for a short time in the diluted state and only in the absence of decomposition catalysts (such as hydrogen fluoride or metal fluorides), otherwise it decomposes via the di- and trimer to thiothionyl fluoride and sulfur tetrafluoride .

${\displaystyle \mathrm {3\ SF_{2}\longrightarrow SSF_{2}+SF_{4}} }$

Individual evidence

1. ^ ^{A b c d} A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 564.
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.