Halogen bonding-driven chiral amplification of a bimetallic gold-copper cluster through hierarchical assembly.
basic_science · Level V
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- Record sourced from PubMed, PMID 37992176.
- Also identified by DOI 10.1126/sciadv.adj9013 and PMC identifier 10664983.
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Abstract
Understanding the fundamentals and applications of chirality relies substantially on the amplification of chirality through hierarchical assemblies involving various weak interactions. However, a notable challenge remains for metal clusters chiral assembly driven by halogen bonding, despite their promising applications in lighting, catalysis, and biomedicine. Here, we used halogen bonding-driven assembly to achieve a hierarchical degree of achiral emissive <b>Au<sub>2</sub>Cu<sub>2</sub></b> clusters. From single crystals to one-dimensional ribbons and then to helixes, the morphologies were primarily modulated by intermolecular halogen bonding that evoked by achiral or/and chiral iodofluorobenzene (IFBs) molecules. Concomitantly, the luminescence and circularly polarized luminescence (CPL) changed a lot, ultimately leading to a substantial increase in the luminescence dissymmetry <i>g</i>-factor (<i>g</i><sub>lum</sub>) of 0.036 in the supramolecular helix. This work opens an avenue for hierarchical assemblies using predesigned metal clusters as building blocks though directional halogen bonding. This achievement marks a noteworthy advancement in the field of nanosized inorganic functional blocks.