Dimension-Tunable Supramolecular Organic Frameworks with Chiral Pore Channels for Selective Guest Encapsulation and Enhanced Circularly Polarized Luminescence

Here, we report a dimension-tunable supramolecular organic framework (SOF) with chiral pore channels, which shows selective guest encapsulation and enhanced circularly polarized luminescence (CPL). SOFs from a chiral para-substituted bis-naphthalene bis-urea (PNU) are fabricated by both vapor diffusion crystallization and an antisolvent self-assembly approach, leading to the formation of one-dimensional (1D) micrometer-sized single crystal and two-dimensional (2D) plate-like and three-dimensional (3D) octahedral self-assembled microstructures, respectively. The similar permanent porosity of these dimension-tunable chiral SOFs is collectively proved by N₂ adsorption-desorption experiments, single-crystal structure, high-resolution transmission electron microscopy (HR-TEM), and density functional theory (DFT) calculations. By soaking octahedral SOFs in aqueous dye solutions, the chiral porous channels effectively absorb size-matched guest dyes and impart their chirality, leading to enhanced CPL with a dissymmetry factor of 1.6 × 10^-2. This work provides insights for the efficient synthesis of chiral SOFs with pore channels from a single component, which also deepens our understanding of size-selective adsorption and chirality transfer in confined space, as well as the enhancement of circularly polarized luminescence.