Abstract
The potential functions of internal rotation around the Csp2-S bond in the compounds p-RC6H4S· CH3 (R = NH2, OCH3, CH3, H, F, Cl, CN, NO2) are studied by ab initio quantum-chemical calculations taking into account the correlation energy for all the electrons (MP2/6-31G*) and in the approximation of the density functional theory (B3LYP/6-31G*). As the electron-donor power of the p-substituents decreases and their electron-acceptor power grows, the molecular conformation changes in the sequence orthogonal-free rotation-planar. The interaction of the sulfur lone electron pairs with the aromatic ring is studied by the natural bond orbital method. The effect that the conformational changes occurring upon replacement of p-substituents exert on the electron density redistribution is demonstrated. The first Koopmans ionization potentials and the geometric parameters of the molecule are reported.
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Bzhezovskii, V.M., Kapustin, E.G. Potential Functions of Internal Rotation around the Csp2-S Bond and Intramolecular Interactions in Thioanisoles p-RC6H4SCH3 . Russian Journal of General Chemistry 74, 74–82 (2004). https://doi.org/10.1023/B:RUGC.0000025172.49653.1f
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DOI: https://doi.org/10.1023/B:RUGC.0000025172.49653.1f