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.
标题化合物 C14H9NOS(1)和 C14H9NO2S(2)是母体化合物 10-乙炔基-10H-吩噻嗪的氧化产物。它们在跨annular 相互作用方面有所不同,(2) 中分子内 S...N 接触较短。在这两种晶体中都检测到了分子间的 Csp-H...O 氢键,并发现 (1) 形成的氢键更强。这些结果与(2)中 Csp-H 的酸度较低相一致,这是因为跨annular S...N 相互作用增加了 π 电子密度。