Chiral Tin‐Oxo Cluster Matrices with Fluorophore Embedment for Multichromatic Circularly Polarized Luminescence

Abstract

Tin‐oxo clusters, characterized by their well‐defined chemical compositions and architectures, are multi‐metal aggregates composed of Sn‐oxide cores and surface ligands. Chirality, a fundamental characteristic governing biological recognition and signal transduction, remains underexplored in stannate clusters compared to extensively studied precious metal clusters. Herein, three enantiomeric pairs of chiral tin‐oxo clusters were constructed using axially chiral 1,1'‐binaphthol (BINOL) ligands. Structural analyses revealed supramolecular helical assemblies mediated by directional C‐H···p interactions, while circular dichroism (CD) spectroscopy confirmed their intrinsic chirality. Through an in‐situ doping engineering, non‐chiral fluorophores with distinct emission profiles were incorporated during chiral cluster crystallization, yielding composite materials exhibiting circularly polarized luminescence (CPL). The optimized system achieved a maximum dissymmetry factor (glum) of 1.5 × 10‐2. Mechanistic studies established that the spiral packing of the tin‐oxo clusters facilitates stereochemical information transfer to the dyes via spatial confinement effect. This supramolecular chirality induction paradigm offers new insights into the rational design of multifunctional optical materials.