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Title: S3O2 - An unusual structure with π*- π* interaction
Authors: Wah Wong, M. 
Steudel, R.
Issue Date: 2006
Citation: Wah Wong, M., Steudel, R. (2006). S3O2 - An unusual structure with π*- π* interaction. Physical Chemistry Chemical Physics 8 (11) : 1292-1297. ScholarBank@NUS Repository.
Abstract: The structures and relative stabilities of 15 S3O2 isomers have been investigated by G3X(MP2), CCSD(T)/aug-cc-pVTZ and MRCI/CASSCF calculations. The global energy minimum is a three-membered sulfur ring with two adjacent sulfoxide groups in a trans conformation, i.e. a vic-disulfoxide of C2 symmetry. The SS bond lengths are 2.136 (2×) and 2.354 Åat the CCSD(T)/cc-pVTZ level of theory. There is a strong interaction between the π* orbitals of the two S=O moieties both in the trans and in the almost degenerate cis conformer. The corresponding chain-like singlet and triplet isomers of connectivity OSSSO lie close in energy (ca. 67 kJ mol -1) while five-membered and branched four-membered rings are significantly less stable. The structure of S3O2 is in contrast to that of the isoelectronic analogue S5, which exists as a five-membered twisted heterocycle. © the Owner Societies 2006.
Source Title: Physical Chemistry Chemical Physics
ISSN: 14639076
DOI: 10.1039/b517551h
Appears in Collections:Staff Publications

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