Bridge-induced taming of the visible electronic circular dichroism signatures of helicoBODIPYs
作者:Carolina Díaz-Norambuena、Cesar Ray、Teresa Arbeloa、Ainhoa Oliden-Sánchez、Florencio Moreno、Beatriz L. Maroto、Jorge Bañuelos、Santiago de la Moya
DOI:10.1016/j.dyepig.2023.111907
日期:2024.3
Helically-flexible bis(BODIPY)s based on chiral ethane-1,2-diamine or −1,2-diol bridges (named helicoBODIPYs) are an interesting family of accessible and tunable small multichromophoric organic dyes enabling visible electronic circular dichroism (ECD) and, even visible circularly polarized luminescence (CPL). However, their CPL brightness (BCPL) is still limited (up to ca. 10 M−1cm−1), due to low fluorescence
基于手性乙烷-1,2-二胺或-1,2-二醇桥的螺旋柔性双(BODIPY)(称为螺旋BODIPY)是一个有趣的家族,可访问且可调的小型多发色有机染料,可实现可见电子圆二色性(ECD) ),甚至可见圆偏振发光(CPL)。然而,由于分子内电荷转移(CT)发射的非最佳参与导致荧光效率较低,因此它们的CPL亮度( B CPL)仍然有限(高达约10 M -1 cm -1 )。在此,我们深入分析了该 CT 的起源和控制因素,证明了 BODIPY 到 BODIPY 对称性破缺诱导 CT (SBCT) 的关键参与,由于其推拉特性,超出了每个单个 BODIPY 生色团内的预期 CT 。还证明,增加柔性螺旋BODIPY 乙烷桥的过度拥挤会导致 BODIPY-BODIPY 面临的配置,促进 SBCT 并能够在特定条件下检测 CT 吸收和 CT 发射带。有趣的是,这种 SBCT 增强了可见 ECD(绝对g绝对值),