Infrared Spectra of Complexes of NO2F with BF3, PF5 and SbF5

The infrared spectra of complexes of NO2F with BF3, PF5, and SbF5 have been studied. In each case bands at about 2360 cm—1 were recorded and have been attributed to the nitronium ion NO2+. Bands consistent with a complex anion of the form MFn+1— have been observed, though with less accuracy. It is considered correct to designate these complexes as NO2+BF4—, NO2+PF6—, and NO2+SbF6—.