Dimension-Tunable Supramolecular Organic Frameworks with Chiral Pore Channels for Selective Guest Encapsulation and Enhanced Circularly Polarized Luminescence
Tiejun Li, Dian Niu, Jingdan Zhang, Guanghui Ouyang, Minghua Liu
Abstract
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 N 2 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.