Thiazyl trifluoride explained

Thiazyl trifluoride is a chemical compound of nitrogen, sulfur, and fluorine, having the formula . It exists as a stable, colourless gas, and is an important precursor to other sulfur-nitrogen-fluorine compounds.^[1] 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.^[2]

Preparation

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

or by the oxidative decomposition of by silver(II) fluoride:^[3]

It is also a product of the oxidation of ammonia by .^[4]

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

Reactions

is much more stable than thiazyl fluoride, does not react with ammonia and hydrogen chloride, and only reacts with sodium at 400 °C.^[5] However, the fluoride ligands are labile, and can be displaced by secondary amines.^[6] Thiazyl trifluoride reacts with carbonyl fluoride in the presence of hydrogen fluoride to form pentafluorosulfanyl isocyanate .^[7]

References

1. Oskar Glemser and Rüdiger Mews . Chemistry of Thiazyl Fluoride (NSF) and Thiazyl Trifluoride (NSF₃): A Quarter Century of Sulfur-Nitrogen-Fluorine Chemistry . 1980 . . 19 . 11 . 883–899 . 10.1002/anie.198008831.
2. 10.1016/j.ica.2007.05.016 . The crystal structures of and (NSF₂N(CH₃)CH₂–)₂: How short is the 'Crystallographic' N≡S triple bond? . 2008 . Borrmann . T. . Lork . E. . Mews . R. D. . Parsons . S. . Petersen . J. . Stohrer . W. D. . Watson . P. G. . Inorganica Chimica Acta . 361 . 2. 479–486.
3. Book: Chivers . Tristram. Risto S.. Laitinen . Devillanova, Francesco . Handbook of Chalcogen Chemistry . limited . 2006 . The Royal Society of Chemistry . London . 978-0-85404-366-8 . 10.1039/9781847557575 . 238 . Chalcogen–Nitrogen Chemistry .
4. Book: Biological interactions of sulfur compounds. Steve Mitchell. Steve Mitchell. CRC Press. 1996. 0-7484-0245-4. 14.
5. Book: Huheey . James E. . Keiter . Ellen A. . Keiter . Richard L. . Anorganische Chemie . Walter de Gruyter . Berlin . 2003 . 978-3-11-017903-3 . de. 1021.
6. Book: Roesky, H. W.. Sulfur in Organic and Inorganic Chemistry. 1. Alexander. Senning. 1971. Marcel Dekker. New York. 70-154612. 0-8247-1615-9. The Sulfur - Nitrogen Bond. 29.
7. US . 3,666,784 . patent . Process For Preparing .alpha.,.alpha.-Fluorinated Alkyl Isocyanates . 1972-05-30 . Alan F. Clifford, Thomas C. Rhyne and James W. Thompson.