题目： | Real-space imaging for discovering a rotated node structure in metal-organic framework |
作者： | Jiale Feng1,2#, Zhipeng Feng1,2#, Liang Xu1,2#, Haibing Meng3#, Xiao Chen4*, Mengmeng Ma1,2, Lei Wang1,2, Bin Song1,2, Xuan Tang5, Sheng Dai5, Fei Wei4*, Tao Cheng1,2*, Boyuan Shen1,2* |
单位： | 1Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, Jiangsu, PR China. 2Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, PR China. 3College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China. 4Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China. 5Key Laboratory for Advanced Materials, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China. |
摘要： | Resolving the detailed structures of metal organic frameworks is of great significance for understanding their structure-property relation. Real-space imaging methods could exhibit superiority in revealing not only the local structure but also the bulk symmetry of these complex porous materials, compared to reciprocal-space diffraction methods, despite the technical challenges. Here we apply a low-dose imaging technique to clearly resolve the atomic structures of building units in a metal-organic framework, MIL-125. An unexpected node structure is discovered by directly imaging the rotation of Ti-O nodes, different from the unrotated structure predicted by previous X-ray diffraction. The imaged structure and symmetry can be confirmed by the structural simulations and energy calculations. Then, the distribution of node rotation from the edge to the center of a MIL-125 particle is revealed by the image analysis of Ti-O rotation. The related defects and surface terminations in MIL-125 are also investigated in the real-space images. These results not only unraveled the node symmetry in MIL-125 with atomic resolution but also inspired further studies on discovering more unpredicted structural changes in other porous materials by real-space imaging methods. |
影响因子： | 14.7 |
分区情况： | 一区 |
链接： | https://doi.org/10.1038/s41467-024-51384-9 责任编辑：杜欣 |