Vibrational study in neon matrix of HS-HO, HS-(HO), and (HS)-HO complexes. Identification of the two isomers: HOH-SH (HO proton donor) and HSH-OH (HS proton donor).

For the first time, the investigation of water molecules complexed with hydrogen sulfide in solid neon was performed from 80 to 6000 cm using Fourier transform infrared spectroscopy. In the first step, we identify the ν and ν frequencies of the proton donor in the HS dimer. From concentration effects and with the help of theoretical results, we have highlighted the presence of the two stable isomers, HOH-SH where HO is the proton donor and HSH-OH where HS is the proton donor. We also identify several transitions for (HS)-HO and HS-(HO) complexes, the first step of the microsolvation of HS, and we propose structures for these complexes with the help of theoretical calculations at the second-order Møller-Plesset level.