nitro isomer - spectrum in light green
nitrito isomer - spectrum in blue

Note:
The nitro (NO2-) isomer has a band around 1060 cm-1 that is absent in the nitrito (ONO-) isomer.

References:
1) K. Nakamoto, Infrared and Raman Spectra of Inorganic and Coordination Compounds, 3rd edition, John Wiley & Sons, New York, 1978.
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