Nitro compounds mass spectral fragmentation

J.C. Oxley, J.L. Smith, J. Zhang, C Bedford, A Comparison of the Thermal Decomposition of Nitramines and Difluoroamines J. Phys. Chem. A., 105 (2001) 579-590. J. Zhang, J. Oxley, J. Smith, C. Bedford, R. Chapman Mass Spectral Fragmentation Pathways in Cyclic Difluoroamino and Nitro Compounds J. Mass Spectrometry, 35 (2000), 841-852. 

By the negative chemical ionization (NCI) mass spectral method the negative ions of 2-nitroimidazole are obtained [1305], This method is much more sensitive than the positive chemical ionization one. The analytical potential of the NCI mass spectrometry for the analysis of different classes of nitro compounds has been discussed [1305], Mass spectra of 1,4-dinitro-, 2,4-dinitro-, and 4,5-dinitroimidazoles have been studied [1306], Comparisons of mass spectra (70 eV) of these compounds have shown that the fragment product ions have the same m/z values, but differ in their relative abundance and in the ion appearing the main peak. It seems that this difference is due to the nitramine functionality of 1,4-dinitroimidazole [1306]. 

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