Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 25, Pages 10052-10058Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201908909
Keywords
alkynyl ligands; chirality; circularly polarized luminescence; cluster compound; copper
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Funding
- National Science Fund for Distinguished Young Scholars [21825106]
- National Natural Science Foundation of China [21671175]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [164100510005]
- Program for Innovative Research Team (in Science and Technology) in Universities of Henan Province [19IRTSTHN022]
- Zhengzhou University
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Atomically precise enantiomeric metal clusters are scarce, and copper(I) alkynyl clusters with intense circularly polarized luminescence (CPL) responses have not been reported. A pair of chiral alkynyl ligands, (R/S)-2-diphenyl-2-hydroxylmethylpyrrolidine-1-propyne (abbreviated as R/S-DPM) we successfully prepared and single crystals were characterized of optically pure enantiomeric pair of atomically-precise copper(I) clusters, [Cu-14(R/S-DPM)(8)](PF6)(6) (denoted as R/S-Cu-14), which feature bright red luminescence and CPL with a high luminescence anisotropy factor (g(lum)). A dilute solution containing R/S-Cu-14 was nonluminescent and CPL inactive at room temperature. Crystallization- and aggregation-induced emission (CIE and AIE, respectively) contribute to the triggering of the CPL of R/S-Cu-14 in the crystalline and aggregated states. Their AIE behavior and good biocompatibility indicated applications of these copper(I) clusters in cell imaging in HeLa and NG108-15 cells.
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