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A combination of matrix isolation and FTIR spectroscopy has been employed to investigate the low-temperature photochemistry (4.2 K) of dinitrogen pentaoxide. UV photolysis of the matrix isolated precursor (MR = 1/1000) at λ > 230 nm resulted in the photoreduction of N2O5 to N2O via N2O3 as an intermediate. Both, asym- and sym-N2O3 were formed in argon matrices, whereas in solid nitrogen only asym-N2O3 was produced. Little or no evidence for the formation of isomeric forms of N2O4 was found. Possible photochemical pathways are discussed.
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Koch et al. (1996) studied this question.
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