Flexible and twisted annulated π-systems exhibit numerous unique and desirable features, owing to their ability to display chirality. However, preventing their racemization due to the dynamic nature of their chirality remains a challenge. One promising approach to stabilize homochirality in such systems is chirality transfer from a chiral auxiliary to a moiety displaying dynamic chirality. Herein, we introduce a new approach for dynamic chirality stabilization in conformationally flexible azahelicene species via crystallization-induced intermolecular chirality transfer in Au(I) complexes featuring azahelicene (dibenzo[c,g]carbazole and benzo[c]carbazole) and enantio-pure chiral N-heterocyclic carbene (NHC) ligands with a complementary tailored shape. Crystallization of these azahelicene Au(I) complexes not only suppresses the dynamic chirality of the dibenzocarbazole species but also stabilizes their homochirality through the intermolecular conjunction between the chiral NHC and dibenzocarbazole ligands. In the Au(I) benzocarbazole complexes, the intermolecular conjunction and chirality transfer in the crystals induce chirality in the initially achiral benzocarbazole ligand. Furthermore, the crystallization of the studied complexes activates their circularly polarized luminescence (CPL) properties, which were suppressed in solution. Importantly, chirality transfer leads to significant CPL enhancement; the complexes that feature chirality transfer within the crystal structure exhibit luminescence dissymmetry factors 5 to 10 times higher than those of the complexes without chirality transfer.

中文翻译：

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圆偏振发光激活构象柔性氮杂杂烯 Au(I) 配合物中结晶诱导的手性转移

柔性且扭曲的环形 π 系统由于其显示手性的能力而表现出许多独特且理想的特征。然而，由于其手性的动态性质，防止其外消旋仍然是一个挑战。在此类系统中稳定同手性的一种有前途的方法是将手性从手性助剂转移到显示动态手性的部分。在此，我们介绍了一种新方法，通过在具有氮杂杂烯（二苯并[ c,g ]咔唑和苯并[ c ]咔唑）和对映体纯的Au(I)配合物中结晶诱导的分子间手性转移，实现构象灵活的氮杂杂环烯物种的动态手性稳定。具有互补定制形状的手性N-杂环卡宾（NHC）配体。这些氮杂烯Au(I)配合物的结晶不仅抑制了二苯并咔唑物质的动态手性，而且还通过手性NHC和二苯并咔唑配体之间的分子间结合稳定了它们的纯手性。在 Au(I) 苯并咔唑配合物中，晶体中的分子间结合和手性转移诱导了最初的非手性苯并咔唑配体的手性。此外，所研究的配合物的结晶激活了它们的圆偏振发光（CPL）特性，而这种特性在溶液中被抑制。重要的是，手性转移导致 CPL 显着增强；晶体结构内具有手性转移特征的配合物的发光不对称因子比没有手性转移的配合物高5至10倍。