biostudies-literatureYao ZNational Natural Science Foundation of China10524-10531https://www.ebi.ac.uk/biostudies/studies/S-EPMC8695889biostudies-literatureUnknown11(18)Creating optically pure metal assemblies is a hot research topic in the realms of chiral supramolecules. Here, three new triple-stranded europium(iii) helicates Eu2L3(L')2 [L = 4,4'-bis(4,4,4-trifluoro-1,3-dioxobutyl)diphenyl sulphide; L' = 1,10-phenanthroline (Phen) or R/S-2,2'-bis(diphenylphosphinyl)-1,1'-binaphthyl (R/S-BINAPO)] were synthesized in order to investigate the effects of ancillary ligands on controlling the stereoselective self-assembly of lanthanide helicates. X-ray single crystal structure analysis showed that Eu2L3(Phen)2 crystalized in an achiral space group P1̄ with the equivalent amount of P and M helicates in one single cell. The isolated Eu2L3(S-BINAPO)2 and Eu2L3(R-BINAPO)2 were verified to be enantiopure by 1H, 19F, 31P NMR and DOSY NMR analyses. Additionally, the mirror-image CD spectra also demonstrated the successful syntheses of the enantiomers and the presence of an effective chirality transformation from BINAPO to achiral L. Furthermore, the perfect mirror-image circularly polarized luminescence (CPL) spectra of Eu2L3(S-BINAPO)2 and Eu2L3(R-BINAPO)2 indicated the existence of the excited state chirality of the Eu3+ center associated with |g lum| values reaching 0.112. In addition, the photophysical properties of three helicates were also discussed.RSC advancesAncillary ligand modulated stereoselective self-assembly of triple-stranded Eu(iii) helicate featuring circularly polarized luminescence.PMC86958895177305451872077520730805Li HYao ZYan PZhou YGao TfalseAncillary ligand modulated stereoselective self-assembly of triple-stranded Eu(iii) helicate featuring circularly polarized luminescence.Creating optically pure metal assemblies is a hot research topic in the realms of chiral supramolecules. Here, three new triple-stranded europium(iii) helicates Eu2L3(L')2 [L = 4,4'-bis(4,4,4-trifluoro-1,3-dioxobutyl)diphenyl sulphide; L' = 1,10-phenanthroline (Phen) or R/S-2,2'-bis(diphenylphosphinyl)-1,1'-binaphthyl (R/S-BINAPO)] were synthesized in order to investigate the effects of ancillary ligands on controlling the stereoselective self-assembly of lanthanide helicates. X-ray single crystal structure analysis showed that Eu2L3(Phen)2 crystalized in an achiral space group P1̄ with the equivalent amount of P and M helicates in one single cell. The isolated Eu2L3(S-BINAPO)2 and Eu2L3(R-BINAPO)2 were verified to be enantiopure by 1H, 19F, 31P NMR and DOSY NMR analyses. Additionally, the mirror-image CD spectra also demonstrated the successful syntheses of the enantiomers and the presence of an effective chirality transformation from BINAPO to achiral L. Furthermore, the perfect mirror-image circularly polarized luminescence (CPL) spectra of Eu2L3(S-BINAPO)2 and Eu2L3(R-BINAPO)2 indicated the existence of the excited state chirality of the Eu3+ center associated with |g lum| values reaching 0.112. In addition, the photophysical properties of three helicates were also discussed.2021-01-01T00:00:00Z2021 Mar2025-04-04T19:57:48.385Z2025-04-04T19:57:48.385ZS-EPMC86958893542358310.1039/d1ra01583d