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The H2 S Dimer is Hydrogen-Bonded: Direct Confirmation from Microwave Spectroscopy
Arijit Das1, Pankaj K Mandal2, Frank J Lovas3
1Inorganic and Physical Chemistry Department, Indian Institute of Science, Bangalore, 560012, India.
Angewandte Chemie (International Ed. in English)
|September 29, 2018
Summary
Hydrogen sulfide (H₂S) dimers, previously thought to have weak van der Waals interactions, are now shown to form hydrogen bonds, similar to water (H₂O) dimers. This finding challenges long-held assumptions in chemical bonding.
Area of Science:
- Chemistry
- Physical Chemistry
- Molecular Interactions
Background:
- Early research by Pauling suggested differences in bonding between H₂O and H₂S based on their physical states.
- H₂O was attributed with hydrogen bonds, while H₂S was believed to exhibit only van der Waals interactions.
Purpose of the Study:
- To investigate the bonding interactions within hydrogen sulfide (H₂S) dimers.
- To re-evaluate the nature of intermolecular forces in H₂S and compare it to water (H₂O).
Main Methods:
- Computational modeling or spectroscopic analysis (details not provided in the abstract).
- Dimer formation studies of H₂S.
Main Results:
- The H₂S dimer exhibits hydrogen bonding.
- This bonding is analogous to the hydrogen bonding observed in H₂O dimers.
Conclusions:
- The assumption of only van der Waals interactions in H₂S dimers is incorrect.
- Hydrogen bonding plays a significant role in the intermolecular interactions of H₂S.
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