This study explored the development of functional dyes using aluminum, focusing on aluminum-based dinuclear triple-stranded helicates, and examined the effects of substituent variations on their structural and optical properties. Key findings revealed that the modification of methyl groups to the pyrrole positions significantly extended the conjugation system, resulting in a red shift in the absorption and emission spectra. Conversely, the modification of methyl groups at the methine positions due to steric hindrances increased the torsion angle of the ligands, leading to a blue shift in the absorption and emission spectra. A common feature across all complexes was that in the excited state, one of the three ligands underwent significant structural relaxation. This led to a pronounced Stokes shift and minimal spectra overlap with high photoluminescence behaviors. Moreover, our research extended to the optical resolution of the newly synthesized complexes by analyzing the chiroptical properties of the resulting enantiomers, including their circular dichroism and circularly polarized luminescence. These insights offer valuable contributions to the design and application of novel aluminum-based functional dyes, potentially influencing a range of fields, from materials science to optoelectronics.

中文翻译：

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揭示取代基对双核铝三链螺旋发射变化和圆偏振发光的显着影响

本研究探索了使用铝的功能性染料的开发，重点关注铝基双核三链螺旋，并研究了取代基变化对其结构和光学性质的影响。主要发现表明，甲基对吡咯位置的修饰显着扩展了共轭系统，导致吸收和发射光谱发生红移。相反，由于空间位阻，次甲基位置上的甲基基团的修饰增加了配体的扭转角，导致吸收和发射光谱的蓝移。所有配合物的一个共同特征是，在激发态下，三个配体之一经历了显着的结构松弛。这导致了明显的斯托克斯位移和最小的光谱重叠与高光致发光行为。此外，我们的研究通过分析所得对映体的手性光学性质，包括其圆二色性和圆偏振发光，扩展到新合成的配合物的光学分辨率。这些见解为新型铝基功能染料的设计和应用提供了宝贵的贡献，可能影响从材料科学到光电子学的一系列领域。