INFRARED SPECTRA OF NEW NITROGEN-SULFUR SPECIES IN ARGON MATRICES.
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Date
1991
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Ohio State University
Abstract
New nitrogen-sulfur species were produced by the addition of sulfur vapor into an argon/nitrogen microwave discharge generated within a constricted orifice discharge tube, and the reaction products were trapped in argon matrices at 12K. Nitrogen-15 and sulfur-34 isotopic substitutions, concentration variation, photolysis and changes upon annealing provided a basis for identification and characterization of the new products. A relatively weak absorption at $1209.4 cm^{-1}$ is assigned to the diatomic NS radical. An intense absorption at $1225.2 cm^{-1}$, which showed a triplet absorption with mixed sulfur isotopes and a doublet with mixed nitrogen isotopes, is assigned to the antisymmetric stretching vibration of SNS. An absorption band at $2040.2 cm^{-1}$, which showed quartet and doublet patterns with mixed nitrogen and mixed sulfur isotopes, respectively, is assigned to the nitrogen-nitrogen stretching fundamental of $N_{2}S$. Bond lengths, bond angles and infrared absorptions predicted from ab initio calculations will also be presented.
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Author Institution: Department of Chemistry, University of Virginia