scaffolds for numerous applications, such as bioimaging or synthetic photochemistry. While variation of the substitution pattern at the heterocycle and aryl groups allows dye modulation, the bond rotational barriers are also strongly affected. Unsymmetrically substituted ring systems of rotationally restricted arylated heterocycles therefore lead to configurationally stable atropisomeric fluorophores.
芳基化杂环荧光团是许多应用特别有用的支架,例如
生物成像或合成光
化学。虽然杂环和芳基取代模式的变化允许
染料调制,但键旋转势垒也受到强烈影响。因此,旋转受限的芳基化杂环的不对称取代环系统导致构型稳定的阻转异构荧光团。在此,我们通过确定阻转异构、三邻位取代
萘基-
吖啶荧光团的性质和构型稳定性来描述这些特征。测量到大于 120 kJ mol–1 的显着旋转障碍,这使得这些
染料和相关化合物在很宽的温度范围内具有不同的阻转异构体,具有立体异构体特异性。