Charge-mediated Cuδ+ sites in dimension-controlled covalent organic frameworks enable base-free continuous photothermal CO2 cyclization

作者：Xingwang Lan, Yize Zhang, Lu Chen, Riyuan Zhang, Haobo Xu, Guoyi Bai, Zhiming Zhang · 发表于：National Science Review · 年份：2025 · DOI：10.1093/nsr/nwaf350 · 被引用次数：21 · 研究领域：Covalent Organic Framework Applications、CO2 Reduction Techniques and Catalysts、Advanced Photocatalysis Techniques

ABSTRACT The structural topology of covalent organic frameworks (COFs) critically governs their catalytic performance. However, the structure–property correlation regarding dimension-dependent charge polarization at catalytic sites remains poorly understood. Herein, we describe a dimensional engineering strategy to tailor the local microenvironment of Cu sites through constructing phenanthroline-based COFs with distinct architectures (2D vs 1D). Systematic characterization and theoretical analyses reveal that the molecular flexibility and mesoporous channels in 2D COFs promote non-radiative transitions and mass transport, while their layered architecture enables light-controlled thermal modulation of Cuδ+ (1 ≤ δ ≤ 2) electronic states, synergistically enhancing substrate adsorption and activation. Remarkably, a Cu-2D-COF achieves near-quantitative yield (99.9%) in visible-light-driven carboxylative cyclization of propargylic amines with CO2 under base-free conditions. We further engineered a continuous-flow photocatalytic system that demonstrates exceptional operational stability, delivering 2.143 g of pharmaceutical-grade 2-oxazolidinones with >95% purity. This work provides strategies for manipulating the local microenvironment through dimension-controlled frameworks in CO2 conversion.