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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, Cu14 (R/S-DPM)8 (PF6 )6 (denoted as R/S-Cu14 ), which feature bright red luminescence and CPL with a high luminescence anisotropy factor (glum ). A dilute solution containing R/S-Cu14 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-Cu14 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.
Zhang et al. (Fri,) studied this question.
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