Infrared matrix isolation studies of complexes formed between dimethylsulfide, dimethyldisulfide and nitrous acid

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 v(1) OH stretching vibration of the pertu rbed trans-HONO monomer is 425 and 294 cm(-1) red shifted, respectively, fo r 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 v(3) NOH in-plane def ormation mode: 101 and 80 cm(-1) for DMS-HONO-trans in argon and nitrogen m atrices and 46 cm(-1) for DMDS-HONO-trans in nitrogen matrix. The results i ndicate formation of strong hydrogen bonds in the studied DMS-HONO and DMDS -HONO systems. The origin of the complicated shape of the v(1) OH absorptio n is discussed. Similarities and differences between argon and nitrogen mat rices are considered. (C) 2000 Elsevier Science B.V. All rights reserved.