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Niu, Zhihao; Wu, Qiaozhuo; Li, Qingzhong; Scheiner, Steve
International journal of molecular sciences, 07/2023, Letnik: 24, Številka: 15Journal Article
The tetrel bond (TB) between 1,2-benzisothiazol-3-one-2-TFsub.3-1,1-dioxide (T = C, Si) and the O atom of pyridine-1-oxide (PO) and its derivatives (PO-X, X = H, NOsub.2, CN, F, CHsub.3, OH, OCHsub.3, NHsub.2, and Li) is examined by quantum chemical means. The Si∙∙∙O TB is quite strong, with interaction energies approaching a maximum of nearly 70 kcal/mol, while the C∙∙∙O TB is an order of magnitude weaker, with interaction energies between 2.0 and 2.6 kcal/mol. An electron-withdrawing substituent on the Lewis base weakens this TB, while an electron-donating group has the opposite effect. The SiFsub.3 group transfers roughly halfway between the N of the acid and the O of the base without the aid of cooperative effects from a third entity.
