近日，吉林大学孙福兴团队报道了3D共价有机框架从可扭曲的构建块到前所未有的ibd-r拓扑，用于高效的C₃H₆/C₂H₄分离。相关论文发表在2025年12月16日出版的《德国应用化学》杂志上。

由于结构拓扑和孔道特征的多样性有限，如何精心设计并合成适用于高效气体分离的三维共价有机框架（3D COFs）仍然是一个巨大的挑战。

研究组基于一种具有可扭转D3对称构型的六配位构筑单元，结合三种不同的矩形构筑单元，采用[6+4]设计策略构建了一系列等网状3D COFs材料，分别命名为JUC-320、JUC-321和JUC-322。六配位构筑单元的扭转柔性使目标网络能够形成前所未有的自穿插ibd-r拓扑结构，并有效减小了孔道尺寸。

值得注意的是，这些COFs在丙烯/乙烯（C₃H₆/C₂H₄）分离中表现出优异的性能，具有高吸附比和选择性。动态突破实验进一步证实了它们能够高效分离丙烯/乙烯混合气体（30/70，v/v），并获得聚合物级乙烯（纯度>99.99%）。该研究为构建具有新型拓扑结构和多孔架构的3D COFs提供了有效策略，从而推动高效气体分离技术的发展。

附：英文原文

Title: 3D Covalent Organic Frameworks from Twistable Building Block Toward an Unprecedented ibd-r Topology for Efficient C3H6/C2H4 Separation

Author: Xilin Li, Tongyi Zhao, Yali Sun, Zitao Wang, Zhenhe Song, Yiyu Guan, Hao Ren, Fuxing Sun

Issue&Volume: 2025-12-16

Abstract: Owing to the limited diversity of structural topologies and pore features, it remains a tremendous challenge to elaborately design and synthesize three-dimensional covalent organic frameworks (3D COFs) for efficient gas separation. In this study, we present a series of isoreticular 3D COFs using [6 + 4] design strategy based on a designed 6-coordinated (6-c) building block with twistable D3-symmetric configuration and three different rectangular building blocks, named JUC-320, -321, and -322, respectively. The torsional flexibility of 6-c building blocks enables the targeted network to adopt an unprecedented self-catenated ibd-r topology with reduced pore sizes. Remarkably, these COFs exhibit exceptional performances in C3H6/C2H4 separation with high adsorption ratios and selectivities. Dynamic breakthrough experiments further confirmed their ability to efficiently separate C3H6/C2H4 mixtures (30/70, v/v), yielding polymer-grade C2H4 (>99.99%). This work offers a useful strategy for constructing 3D COFs with unprecedented topologies and porous architectures toward efficient gas separation.

DOI: 10.1002/anie.202520950

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202520950