The S∴π hemibond and its competition with the S∴S hemibond in the simplest model system: infrared spectroscopy of the [benzene-(H₂S) _n ]⁺ (n = 1-4) radical cation clusters.

ABSTRACT: The S∴π hemibond (two-center three-electron, 2c-3e, bond) is an attractive interaction between a sulfur atom and π electrons. The S∴π hemibond is of essential importance in understanding chemistry of sulfur radical cations, and its roles in biochemistry have recently attracted much interest. In the present study, we observe the S∴π hemibond in the simplest model system in the gas phase. Infrared spectroscopy is applied to the [benzene-(H₂S) _n ]⁺ (n = 1-4) radical cation clusters. In n = 1, the CH stretch and SH stretch bands of the benzene and H₂S moieties, respectively, are clearly different from those of the neutral molecules but similar to those of the ionic species. These vibrational features show that the positive charge

SUBMITTER: Wang D 

PROVIDER: S-EPMC6685351 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature