IR spectrum of molecular complexes of sulfuric acid with N₂ and NO trapped in solid argon

Abstract

The IR spectra of vapours above neat sulfuric acid trapped, mixed with varying amounts of N₂ and NO gases in argon matrices are reported. Absorptions due to 1:1 (N₂)·(H₂O), (N₂)·(H₂SO₄), (NO)·(H₂O), (NO)·(H₂SO₄) and (N₂O₂)·(H₂SO₄) dimeric complexes were identified in all relevant spectral regions. The interactions of nitrogen and nitrogen oxides with SO₃ do not indicate complex formation. A T-shaped attachment of N₂ to H₂SO₄, and an O-end interaction of the nitrogen oxide monomer and dimer with the OH groups of H₂SO₄ is suggested. The formation of the complex species is by surface diffusion during deposition and not a result of vapour phase equilibria.

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