Thiazyl trifluoride

Thiazyl trifluoride is a chemical compound of nitrogen, sulfur, and fluorine, having the formula NSF₃. It exists as a stable, colourless gas, and is an important precursor to other sulfur-nitrogen-fluorine compounds.^[2] It has tetrahedral molecular geometry around the sulfur atom, and is regarded to be a prime example of a compound that has a sulfur-nitrogen triple bond.^[3]

Thiazyl trifluoride

Names
IUPAC name Thiazyl trifluoride
Other names Sulfur(VI) nitride trifluoride Trifluorosulfanenitrile[1]
Identifiers
CAS Number	15930-75-3 N
3D model (JSmol)	Interactive image
ChEBI	CHEBI:30507 Y
ChemSpider	123471 Y
PubChem CID	140008
CompTox Dashboard (EPA)	DTXSID30166628
InChI InChI=1S/F3NS/c1-5(2,3)4 Y Key: UQUPGRNSXINWBS-UHFFFAOYSA-N Y InChI=1/F3NS/c1-5(2,3)4 Key: UQUPGRNSXINWBS-UHFFFAOYAR
SMILES FS(F)(F)#N
Properties
Chemical formula	NSF3
Molar mass	103.06 g·mol−1
Appearance	Colourless gas
Melting point	−72.6 °C (−98.7 °F; 200.6 K)
Boiling point	−27.1 °C (−16.8 °F; 246.1 K)
Structure
Molecular shape	Tetrahedral at the S atom
Hybridisation	sp3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Preparation

NSF₃ can be synthesised by the fluorination of thiazyl fluoride, NSF, with silver(II) fluoride, AgF₂:

NSF + 2 AgF₂ → NSF₃ + 2 AgF

or by the oxidative decomposition of FC(O)NSF₂ by silver(II) fluoride:^[4]

FC(O)NSF₂ + 2 AgF₂ → NSF₃ + 2 AgF + COF₂

It is also a product of the oxidation of ammonia by S₂F₁₀.^[5]

Direct fluorination of mercury difluorosulfinimide (Hg(NSF₂)₂) does not give thiazyl trifluoride, but instead the isomeric fluoriminosulfur difluoride (F₂SNF).^[6]

Reactions

NSF₃ is much more stable than thiazyl fluoride, does not react with ammonia and hydrogen chloride, and only reacts with sodium at 400 °C.^[7] However, the fluoride ligands are labile, and can be displaced by secondary amines.^[6] Thiazyl trifluoride reacts with carbonyl fluoride (COF₂) in the presence of hydrogen fluoride to form pentafluorosulfanyl isocyanate (SF₅NCO).^[8]