Chiral lanthanide helicates with circularly polarized luminescence (CPL) properties have found potential application in bioanalyses and chirality sensing. However, the preparation of the enantiopure helicates through a coordination-directed self-assembly strategy is challenging due to the greatly labile coordination geometries of lanthanide ions. Herein, a pair of enantiopure triple-stranded Eu^III helicates [(Eu₂L₃)(R/S-BINAPO)₂] are assembled by three achiral C₂-symmeric bis-β-diketones (4,4′-bis(4,4,4-trifluoro-1,3-dioxobutyl)(phenoxyl)-1,1′-biphenyl, L) helically twisting around two Eu^III ions, and two chiral R/S-bis(diphenylphosphoryl)-1,1′-binaphthyl (R/S-BINAPO) as ancillary ligands. Electrospray ionization–mass spectrometry, NMR, and circular dichroism (CD) spectra confirm the formation of a pair of enantiopure chiral topological helicates (Eu₂L₃)(R-BINAPO)₂ and (Eu₂L₃)(S-BINAPO)₂. As expected, the helicates present strong CPL with the |g_lum| up to 0.09, and the higher luminescent quantum yields (QYs) of up to 51 %.

已发现具有圆偏振发光（CPL）特性的手性镧系元素螺旋化合物在生物分析和手性传感中具有潜在的应用前景。但是，由于镧系离子的配位几何形状非常不稳定，通过配位导向的自组装策略制备对映体纯螺旋体具有挑战性。在此，一对对映体纯的三链铕^III helicates [（EU ₂大号₃）（R / S-BINAPO）₂ ]通过三个非手性Ç组装₂ -symmeric双- β二酮（4,4'-双（ 4,4,4-三氟-1,3-二氧杂丁基）（苯氧基）-1,1'-联苯，L）绕两个Eu ^III离子和两个手性R / S螺旋扭曲-双（二苯基磷酰基）-1,1'-联萘基（R / S-BINAPO）作为辅助配体。电喷雾电离质谱，NMR和圆二色性（CD）光谱证实了一对对映纯手性拓扑螺旋分子（Eu ₂ L ₃）（R-BINAPO）₂和（Eu ₂ L ₃）（S-BINAPO）的形成₂。如预期的那样，螺旋桨与| 摹_LUM | 高达0.09，并且更高的发光量子产率（QYs）高达51％。