title: Transannular S···N interactions in 10-ethynyl-10H-phenothiazine 5-oxide and 5,5-dioxide.
abstract: The title compounds, C14H9NOS, (1), and C14H9NO2S, (2), are oxidation products of the parent compound 10-ethynyl-10H-phenothiazine. They differ with respect to transannular interactions, the intramolecular S···N contact being shorter in (2). Intermolecular Csp-H···O hydrogen bonds were detected in both crystals, and (1) was found to form stronger hydrogen bonds. These results are in agreement with the lower acidity of Csp-H in (2), caused by an increase in π-electron density due to the transannular S···N interaction.
authors: Department of Material Science and Chemistry, Wakayama University, Sakaedani, Wakayama 640-8510, Japan.
authors: Satoru
authors: S
authors: Umezono
authors: Satoshi
authors: S
authors: Ikeda
authors: Tsunehisa
authors: T
authors: Okuno
keywords: 10-ethynyl-10H-phenothiazine; crystal structure; intramolecular S...N contact; oxidation products; transannular S...N interactions