Engineering intelligent chiral silver cluster-assembled materials for temperature-triggered dynamic circularly polarized luminescence

The development of stimuli-responsive circularly polarized luminescence (CPL) materials is quite attractive but challenging. Here, a pair of atomically precise enantiomers R/S-Ag20 nanoclusters has been synthesized using chiral acid ligands. And then, stimuli-responsive CPL materials were developed by assembling the chiral silver nanoclusters with an achiral bridging ligand. The atomically precise silver cluster-assembled materials produce CPL with a dissymmetry factor (|glum|) of 1 x 10-3, through the high-efficiency chiral induction process. More interestingly, the single CPL band at room temperature could quickly transform into highly separated dual CPL emissions at low temperature. This study provides a new strategy for the rational functionalization of chiral silver clusters in preparing cluster-based CPL emitters and enriches the types of stimuli-responsive CPL materials. The temperature-triggered dynamic circularly polarized luminescence materials were constructed by the coordination assembly of chiral silver nanoclusters and luminophor linkers.image