Molecular complexes of nitric acid with N2, CO and NO studied by matrix isolation IR spectroscopy
The interaction of nitric acid with dinitrogen, carbon monoxide and nitric oxide has been investigated by IR spectroscopy in low-temperature argon matrices. The spectra show that under these conditions N2 interacts strongly and specifically with HNO3, forming several distinct 1:1 complexes. The probable structures of these complexes are discussed. CO behaves in a similar manner to N2, forming complexes of the type OC⋯H—ONO2; weak bands due to a CO⋯H—ONO2 complex were generated by photolysis. For NO, complexes of HNO3 were observed with both monomeric and dimeric NO. The strength of interaction with HNO3 was found to increase in the order N2 < NO < CO.