title: The Intermolecular S−H⋅⋅⋅Y (Y=S,O) hydrogen bond in the H2S dimer and the H2 S-MeOH complex.
abstract: The nature of the S−H⋅⋅⋅S hydrogen-bonding interaction in the H2 S dimer and its structure has been the focus of several theoretical studies. This is partly due to its structural similarity and close relationship with the well-studied water dimer and partly because it represents the simplest prototypical example of hydrogen bonding involving a sulfur atom. Although there is some IR data on the H2 S dimer and higher homomers from cold matrix experiments, there are no IR spectroscopic reports on S−H⋅⋅⋅S hydrogen bonding in the gas phase to-date. We present experimental evidence using VUV ionization-detected IR-predissociation spectroscopy (VUV-ID-IRPDS) for this weak hydrogen-bonding interaction in the H2 S dimer. The proton-donating S−H bond is found to be red-shifted by 31 cm(-1) . We were also able to observe and assign the symmetric (ν1 ) stretch of the acceptor and an unresolved feature owing to the free S−H of the donor and the antisymmetric (ν3 ) SH stretch of the acceptor. In addition we show that the heteromolecular H2 S-MeOH complex, for which both S−H⋅⋅⋅O and O−H⋅⋅⋅S interactions are possible, is S-H⋅⋅⋅O bound.
authors: Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India.
authors: Aditi
authors: A
authors: Bhattacherjee
authors: Yoshiyuki
authors: Y
authors: Matsuda
authors: Asuka
authors: A
authors: Fujii
authors: Sanjay
authors: S
authors: Wategaonkar
mesh_terms: D019281:Dimerization; D006860:Hydrogen Bonding; D006862:Hydrogen Sulfide / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry*; D008958:Models, Molecular; D013055:Spectrophotometry, Infrared
chemical_list: D000432:Methanol; D006862:Hydrogen Sulfide