Nitrosonium tetrafluoroborate
Introduction '''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.NOBF4 is the nitrosonium salt of fluoroboric acid, and is composed of a nitrosonium cation, NO+, and a tetrafluoroborate anion, BF4−.
Reactions 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.Nitrosonium tetrafluoroborate may be used to prepare metal salts of the type MII(CH3CN)''x''BF42 (M = Cr, Mn, Fe, Co, Ni, Cu). The nitrosonium cation acts as the oxidizer, itself being reduced to nitric oxide gas:: M + 2NOBF4 + ''x''CH3CN → M(CH3CN)''x''(BF4)2 + 2NOWith ferrocene the ferrocenium tetrafluoroborate is formed.In its infrared spectrum of this salt, νNO is a strong peak at 2387 cm−1.
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