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Title
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The challenging world of simple inorganic rings : revisiting Roesky's ketone and Roesky's sulfoxide
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Author
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Abstract
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| The surprising differences between the experimental solid-state and calculated gas-phase structures of 5-oxo-1,3,2,4-dithiadiazole (Roesky's ketone, 1) and 1-oxo-1,2,4,3,5-trithiadiazole (Roesky's sulfoxide, 2), identified and studied in a series of papers published between 2004 and 2010 but then never satisfactorily explained, have been revisited, making use of the more advanced computational possibilities currently available. The previous calculations' considerable overestimations of the C-S and S-S bond lengths in 1 and 2, respectively, have been partly explained based on the results of periodic calculations and the application of Valence Bond (VB) Theory. In the case of 1, the crystal environment appears to stabilize a structure with a highly polarized C=O bond, which features a C-S bond with considerable double-bond character - an effect which does not exist for the isolated molecule - explaining the much shorter bond in the solid state. For 2, a similar conclusion can be drawn for the S-S distance. For both compounds, though, packing effects are not the sole source of the differences: the inability of Density Functional Theory (DFT) to properly deal with the electronic structures of these apparently simple main-group systems remains a contributing factor. Performing Molecular Orbital calculations on unsaturated sulfur-nitrogen rings remains a challenging task. One particular unresolved issue was the large difference between the experimental solid-state geometries and the gas-phase geometries of two five-membered ring systems, calculated by a variety of methods including DFT, MP4(SDQ) and CCSD(T). New solid-state and Valence Bond calculations present a partial explanation, even though a full final answer fails to emerge.image |
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Language
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English
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Source (journal)
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Chemistry: a European journal. - Weinheim
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Publication
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Weinheim
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Wiley-v c h verlag gmbh
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2023
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ISSN
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0947-6539
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DOI
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10.1002/CHEM.202302449
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Volume/pages
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29
:67
(2023)
, p. 1-7
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Article Reference
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e202302449
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ISI
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001084180600001
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Pubmed ID
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37650487
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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