On the formation of nitryl bromide and nitryl iodide and the infrared spectra of the matrix isolated molecules

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Mixtures of bromine or iodine and argon are passed through a microwave discharge. The resulting gas mixtures are condensed on a cold window at 9 K together with nitrogen dioxide and a large excess of argon as an inert matrix material. Six new absorptions are found in the infrared spectra in both cases. They can be assigned to nitryl bromide or nitryl iodide, respectively, according to a C 2 v point symmetry of the planar molecules. Frequencies, 15N-isotopic shifts, and calculated force constants are in good agreement with expected values extrapolated from the known nitryl fluoride and nitryl chloride.