Recently, helicene derivatives have emerged as an important class of molecules with potential applications spanning over asymmetric catalysis, biological activity, magnetism, spin filtering, solar cells, and polymer science. To harness their full potential, especially as emissive components in circularly polarized organic light-emitting diodes (CP-OLEDs), generating structural chemical diversity and understanding the resulting photophysical and chiroptical properties are crucial. In this Account, we shed light on chemical engineering combining helicene and N-heterocyclic carbene (NHC) chemistries to create transition-metal complexes with unique architectures and describe their photophysical and chiroptical attributes. The σ-donating and π-accepting capabilities of the helically chiral π-conjugated NHCs endow the complexes with remarkable structural and electronic features. These characteristics manifest in phenomena such as chirality induction, very long-lived phosphorescence, and strong chiroptical signatures (electronic circular dichroism and circularly polarized luminescence).

中文翻译：

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源自螺旋 N-杂环卡宾 （NHC） 的手性有机金属配合物：设计、结构多样性以及手性光学和光物理特性


最近，螺旋烯衍生物已成为一类重要的分子，其潜在应用涵盖不对称催化、生物活性、磁性、自旋过滤、太阳能电池和聚合物科学。为了充分发挥它们的潜力，特别是作为圆偏振有机发光二极管 （CP-OLED） 中的发射组件，产生结构化学多样性并了解由此产生的光物理和手光学特性至关重要。在本专题中，我们阐明了化学工程将螺旋烯和 N-杂环卡宾 （NHC） 化学相结合，以创建具有独特结构的过渡金属络合物，并描述了它们的光物理和手光学属性。螺旋手性 π 共轭 NHC 的σ供体和π接受能力赋予了复合物显着的结构和电子特征。这些特性表现在手性诱导、非常长寿命的磷光和强手性特征（电子圆二色性和圆偏振发光）等现象中。