Long chalcogen-chalcogen bonds in electron-rich two and four center bonds: combination of π- and σ-aromaticity to a three-dimensional σ/π-aromaticity
Quantum chemical calculations were carried out by applying density functional theory to study the two center-three electron (2c-3e) bonds between the sulfur centers of cyclic dithioethers. Calculated were the S-S distance, the stabilization energy, and the energy of the σ → σ* transition. The extens...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
July 10, 2014
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| In: |
The journal of organic chemistry
Year: 2014, Volume: 79, Issue: 16, Pages: 7543-7552 |
| ISSN: | 1520-6904 |
| DOI: | 10.1021/jo501277h |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/jo501277h Verlag, lizenzpflichtig, Volltext: https://pubs.acs.org/doi/10.1021/jo501277h 
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| Author Notes: | Rolf Gleiter and Gebhard Haberhauer |
MARC
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| 520 | |a Quantum chemical calculations were carried out by applying density functional theory to study the two center-three electron (2c-3e) bonds between the sulfur centers of cyclic dithioethers. Calculated were the S-S distance, the stabilization energy, and the energy of the σ → σ* transition. The extension of the calculations to two (2c-3e) bonds in one molecule shows that a rearrangement to one σ bond and two lone pairs on sulfur is usually more favorable. Exceptions are [H2S2+]2, the dimer of the 1,2-dithia-3,5-diazolyl radical (27a), the dimer of the 1,2,4-trithia-3,5-diazolyl radical cation (26a2+), and its Selena congeners and derivatives. In the case of [H2S2+]2, the (4c-6e) bond between the chalcogen centers is a good description of this dimer. To describe the binding situation in the dimer 26a2+ and 27a, the concept of a “simple” (4c-6e) bond was extended. Our calculations reveal a strong σ-aromaticity within the plane of the four sulfur centers in addition to a strong π-conjugation within the five-membered rings. The whole phenomenon can best be described as a three-dimensional σ/π-aromaticity within the 14π dimers. | ||
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