Journal article
Acid–Base Formalism in Dispersion-Stabilized S–H···Y (Y═O, S) Hydrogen-Bonding Interactions
The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, Vol.119(7), pp.1117-1126
02/19/2015
DOI: 10.1021/jp511904a
PMID: 25611613
Abstract
The role of sulfhydryl (S-H) group as hydrogen bond donor is not as well studied as that of hydroxyl (O-H). In this work we report on the hydrogen-bonding properties of S-H donor in 1:1 complexes of H2S with diethyl ether (Et2O), dibutyl ether (Bu2O), and 1,4-dioxane (DO). The complexes were prepared in supersonic jet and investigated using infrared predissociation spectroscopy based on VUV photoionization detection. The IR spectra of all the complexes showed the presence of a broad, intensity-enhanced, and red-shifted hydrogen-bonded S-H stretching transition. The S-H stretching frequency was red-shifted by 46, 63, and 49 cm-1 in H2S-Et2O, H2S-Bu2O, and H2S-DO complexes, respectively, suggesting that all the complexes are S-H⋯O bound. Computationally, two different S-H⋯O bound structures, namely, "coplanar" and "perpendicular", were obtained as the minimum energy structures for these complexes at the MP2/6-311++G∗ level, with the former being the global minimum. However, with Dunning-type basis sets (aug-cc-pVDZ and aug-cc-pVTZ) only the perpendicular structures were found to be stable at the MP2 level. The large widths of the bound S-H stretch observed in the experimental spectra (fwhm of 35 to 80 cm-1) were attributed to inhomogeneous broadening due to multiple conformations of the alkyl chains in the coplanar and perpendicular structures populated in the jet. The frequency shifts in the hydrogen-bonded S-H stretching mode as well as the bond dissociation energies of all S-H⋯Y (Y=O,S) complexes of H2S, which includes the H2S dimer and H2S-methanol (H2S-MeOH) complexes reported in our previous work (ChemPhysChem 2013, 14, 905-914), were found to scale linearly with the proton affinity of the acceptor molecule. In this regard the S-H group, like O-H, is found to conform to the widely accepted acid-base nature of hydrogen-bonding interactions.
Details
- Title: Subtitle
- Acid–Base Formalism in Dispersion-Stabilized S–H···Y (Y═O, S) Hydrogen-Bonding Interactions
- Creators
- Aditi Bhattacherjee - Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IndiaYoshiyuki Matsuda - Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki-Aoba, Aoba-ku, Sendai 980-8578, Japan, Institute for Excellence in Higher Education, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai 980-8576, JapanAsuka Fujii - Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki-Aoba, Aoba-ku, Sendai 980-8578, JapanSanjay Wategaonkar - Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
- Resource Type
- Journal article
- Publication Details
- The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, Vol.119(7), pp.1117-1126
- DOI
- 10.1021/jp511904a
- PMID
- 25611613
- ISSN
- 1089-5639
- eISSN
- 1520-5215
- Grant note
- DOI: 10.13039/501100001691, name: Japan Society for the Promotion of Science, award: 26108504, 26288002; DOI: 10.13039/501100001405, name: Tata Institute of Fundamental Research
- Language
- English
- Date published
- 02/19/2015
- Academic Unit
- Chemistry
- Record Identifier
- 9984217456602771
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