Nitrosonium tetrafluoroborate

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Nitrosonium tetrafluoroborate
IUPAC name
nitrosonium tetrafluoroborate
Other names
nitrosyl tetrafluoroborate
14635-75-7 YesY
3D model (Jmol) Interactive image
ChemSpider 9312255 N
ECHA InfoCard 100.035.148
PubChem 151929
Molar mass 116.81 g·mol−1
Appearance colourless crystalline solid
Density 2.185 g cm−3
Melting point 250 °C (482 °F; 523 K) (sublimes)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Nitrosonium tetrafluoroborate, also called nitrosyl tetrafluoroborate, is a chemical compound with the chemical formula NOBF4. This colourless solid finds use in organic synthesis as a nitrosating agent.[1]

NOBF4 is the nitrosonium salt of fluoroboric acid, and is composed of a nitrosonium cation, [NO]+, and a tetrafluoroborate anion, [BF4].


Nitrosonium tetrafluoroborate may be used to prepare metal salts of the type [MII(CH3CN)x][BF4]2 (M = Cr, Mn, Fe, Co, Ni, Cu). The nitrosonium cation acts as the oxidizer, itself being reduced to nitric oxide gas:[2]

M + NOBF4 + xCH3CN → [M(CH3CN)x](BF4)2 + NO

With ferrocene the ferrocenium tetrafluoroborate is formed.[3]


  1. ^ "A15806 Nitrosonium tetrafluoroborate, 98%". Alfa Aesar website. Retrieved 2010-09-04. 
  2. ^ Robert A. Heintz; Jennifer A. Smith; Paul S. Szalay; Amy Weisgerber; And Kim R. Dunbar. "11. Homoleptic Transition Metal Acetonitrile Cations with Tetrafluoroborate or Trifluoromethanesulfonate Anions". Inorg. Synth. 33: 75–83. doi:10.1002/0471224502.ch2. 
  3. ^ Roger M. Nielson; George E. McManis; Lance K. Safford; Michael J. Weaver (1989). "Solvent and electrolyte effects on the kinetics of ferrocenium-ferrocene self-exchange. A reevaluation". J. Phys. Chem. 93 (5): 2152. doi:10.1021/j100342a086.