首页> 外文期刊>Chemistry: A European journal >7,7,8,8-Tetraaryl-o-quinodimethane Stabilized by Dibenzo Annulation: A Helical p-Electron System That Exhibits Electrochromic and Unique Chiroptical Properties
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7,7,8,8-Tetraaryl-o-quinodimethane Stabilized by Dibenzo Annulation: A Helical p-Electron System That Exhibits Electrochromic and Unique Chiroptical Properties

机译:由二苯并环稳定的7,7,8,8-四芳基-邻-喹二甲烷:螺旋p电子体系,具有电致变色和独特的手性

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摘要

When two benzene rings are fused to a tetraaryl-o-quinodimethane skeleton, sterically hindered helical molecules 1 acquire a high thermodynamic stability. Because the tetraarylbutadiene subunit contains electrondonating alkoxy groups, 1 undergo reversible two-electron oxidation to 2~(2+), which can be isolated as deeply colored stable salts. Intramolecular transfer of the point chirality (e.g., sec-butyl) on the aryl groups to helicity induces a diastereomeric preference in dications 2b~(2+) and 2c~(2+), which represents an efficient method for enhancing circulardichroism signals. Thus, those redox pairs can serve as new electrochiroptical response systems. X-ray analysis of dication 2~(2+) revealed π-π stacking interaction of the diarylmethylium moieties, which is also present in solution. The stacking geometry is the key contributor to the chirosolvatochromic response.
机译:当两个苯环稠合到四芳基-邻-喹二甲烷骨架上时,位阻螺旋分子1获得高的热力学稳定性。由于四芳基丁二烯亚单元含有供电子的烷氧基,因此1经历可逆的两电子氧化反应成2〜(2+),可以将其分离为深色的稳定盐。芳基上的点手性(例如仲丁基)到螺旋上的分子内转移在指示2b〜(2+)和2c〜(2+)中诱导非对映异构偏好,这是增强圆二色性信号的有效方法。因此,这些氧化还原对可以用作新的电按摩响应系统。 X射线对指示2〜(2+)的分析显示了二芳基甲基鎓部分的π-π堆积相互作用,该相互作用也存在于溶液中。堆叠几何形状是手性溶胶变色反应的关键因素。

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