Nitrosonium tetrafluoroborate, also called nitrosyl tetrafluoroborate, is a chemical compound with the chemical formula NOBF4. This colourless solid is used 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, [BF<sub>4</sub>]−.
The dominant property of NOBF4 is the oxidizing power and electrophilic character of the nitrosonium cation. It forms colored charge transfer complexes with hexamethylbenzene and with 18-crown-6. The latter, a deep yellow species, provides a means to dissolve NOBF4 in dichloromethane.[2]
Nitrosonium tetrafluoroborate may be used to prepare metal salts of the type [M<sup>II</sup>(CH<sub>3</sub>CN)<sub>''x''</sub>][BF<sub>4</sub>]2 (M = Cr, Mn, Fe, Co, Ni, Cu). The nitrosonium cation acts as the oxidizer, itself being reduced to nitric oxide gas:[3]
M + 2NOBF4 + xCH3CN → [M(CH<sub>3</sub>CN)<sub>''x''</sub>](BF4)2 + 2NO
With ferrocene the ferrocenium tetrafluoroborate is formed.[4]
In its infrared spectrum of this salt, νNO is a strong peak at 2387 cm−1.[5]