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. 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.
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| IUPAC name Thiazyl trifluoride | |||
| Other names Sulfur(VI) nitride trifluoride Trifluorosulfanenitrile | |||
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| 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). verify (what is ?) 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:
- FC(O)NSF2 + 2 AgF2 → NSF3 + 2 AgF + COF2
It is also a product of the oxidation of ammonia by S2F10.
Direct fluorination of mercury difluorosulfinimide (Hg(NSF2)2) does not give thiazyl trifluoride, but instead the isomeric fluoriminosulfur difluoride (F2SNF).
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. However, the fluoride ligands are labile, and can be displaced by secondary amines. Thiazyl trifluoride reacts with carbonyl fluoride (COF2) in the presence of hydrogen fluoride to form pentafluorosulfanyl isocyanate (SF5NCO).
NSF3 adds HF reversibly to give H2NSF5.
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