Abstract
The complexes formed by dimethylsulphide (DMS) and dimethyldisulphide (DMDS) with two isomers of nitrous acid have been observed, and characterised in argon and nitrogen matrices. The ν 1 OH stretching vibration of the perturbed trans-HONO monomer is 425 and 294 cm −1 red shifted, respectively, for the DMS and DMDS complex in solid argon, and 441 and 301 cm −1 in solid nitrogen. A large blue shift is also observed for the ν 3 NOH in-plane deformation mode: 101 and 80 cm −1 for DMS–HONO- trans in argon and nitrogen matrices and 46 cm −1 for DMDS–HONO- trans in nitrogen matrix. The results indicate formation of strong hydrogen bonds in the studied DMS–HONO and DMDS–HONO systems. The origin of the complicated shape of the ν 1 OH absorption is discussed. Similarities and differences between argon and nitrogen matrices are considered.
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