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Bourda L, Bhandary S, Ito S, Göb CR, Van Der Voort P, Van Hecke K. Analysis of COF-300 synthesis: probing degradation processes and 3D electron diffraction structure. IUCRJ 2024; 11:510-518. [PMID: 38727171 PMCID: PMC11220877 DOI: 10.1107/s2052252524003713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Accepted: 04/23/2024] [Indexed: 07/04/2024]
Abstract
Although COF-300 is often used as an example to study the synthesis and structure of (3D) covalent organic frameworks (COFs), knowledge of the underlying synthetic processes is still fragmented. Here, an optimized synthetic procedure based on a combination of linker protection and modulation was applied. Using this approach, the influence of time and temperature on the synthesis of COF-300 was studied. Synthesis times that were too short produced materials with limited crystallinity and porosity, lacking the typical pore flexibility associated with COF-300. On the other hand, synthesis times that were too long could be characterized by loss of crystallinity and pore order by degradation of the tetrakis(4-aminophenyl)methane (TAM) linker used. The presence of the degradation product was confirmed by visual inspection, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). As TAM is by far the most popular linker for the synthesis of 3D COFs, this degradation process might be one of the reasons why the development of 3D COFs is still lagging compared with 2D COFs. However, COF crystals obtained via an optimized procedure could be structurally probed using 3D electron diffraction (3DED). The 3DED analysis resulted in a full structure determination of COF-300 at atomic resolution with satisfying data parameters. Comparison of our 3DED-derived structural model with previously reported single-crystal X-ray diffraction data for this material, as well as parameters derived from the Cambridge Structural Database, demonstrates the high accuracy of the 3DED method for structure determination. This validation might accelerate the exploitation of 3DED as a structure determination technique for COFs and other porous materials.
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Affiliation(s)
- Laurens Bourda
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281–S3, 9000Ghent, Belgium
- COMOC – Center for Ordered Materials, Organometallics and Catalysis – Department of ChemistryGhent UniversityKrijgslaan 281–S39000GhentBelgium
| | - Subhrajyoti Bhandary
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281–S3, 9000Ghent, Belgium
| | - Sho Ito
- Rigaku Corporation, Haijima, Tokyo, Japan
| | | | - Pascal Van Der Voort
- COMOC – Center for Ordered Materials, Organometallics and Catalysis – Department of ChemistryGhent UniversityKrijgslaan 281–S39000GhentBelgium
| | - Kristof Van Hecke
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281–S3, 9000Ghent, Belgium
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Guo Z, Zhang Z, Sun J. Topological Analysis and Structural Determination of 3D Covalent Organic Frameworks. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2312889. [PMID: 38290005 DOI: 10.1002/adma.202312889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 01/24/2024] [Indexed: 02/01/2024]
Abstract
3D covalent organic frameworks (3D COFs) constitute a new type of crystalline materials that consist of a range of porous structures with numerous applications in the fields of adsorption, separation, and catalysis. However, because of the complexity of the three-periodic net structure, it is desirable to develop a thorough structural comprehension, along with a means to precisely determine the actual structure. Indeed, such advancements would considerably contribute to the rational design and application of 3D COFs. In this review, the reported topologies of 3D COFs are introduced and categorized according to the configurations of their building blocks, and a comprehensive overview of diffraction-based structural determination methods is provided. The current challenges and future prospects for these materials will also be discussed.
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Affiliation(s)
- Zi'ang Guo
- College of Chemistry and Molecular Engineering, Beijing National Laboratory of Molecular Sciences, Peking University, Beijing, 100871, P. R. China
| | - Zeyue Zhang
- College of Chemistry and Molecular Engineering, Beijing National Laboratory of Molecular Sciences, Peking University, Beijing, 100871, P. R. China
| | - Junliang Sun
- College of Chemistry and Molecular Engineering, Beijing National Laboratory of Molecular Sciences, Peking University, Beijing, 100871, P. R. China
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Zeng T, Ling Y, Jiang W, Yao X, Tao Y, Liu S, Liu H, Yang T, Wen W, Jiang S, Zhao Y, Ma Y, Zhang YB. Atomic observation and structural evolution of covalent organic framework rotamers. Proc Natl Acad Sci U S A 2024; 121:e2320237121. [PMID: 38252821 PMCID: PMC10835055 DOI: 10.1073/pnas.2320237121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 12/18/2023] [Indexed: 01/24/2024] Open
Abstract
Dynamic 3D covalent organic frameworks (COFs) have shown concerted structural transformation and adaptive gas adsorption due to the conformational diversity of organic linkers. However, the isolation and observation of COF rotamers constitute undergoing challenges due to their comparable free energy and subtle rotational energy barrier. Here, we report the atomic-level observation and structural evolution of COF rotamers by cryo-3D electron diffraction and synchrotron powder X-ray diffraction. Specifically, we optimize the crystallinity and morphology of COF-320 to manifest its coherent dynamic responses upon adaptive inclusion of guest molecules. We observe a significant crystal expansion of 29 vol% upon hydration and a giant swelling with volume change up to 78 vol% upon solvation. We record the structural evolution from a non-porous contracted phase to two narrow-pore intermediate phases and the fully opened expanded phase using n-butane as a stabilizing probe at ambient conditions. We uncover the rotational freedom of biphenylene giving rise to significant conformational changes on the diimine motifs from synclinal to syn-periplanar and anticlinal rotamers. We illustrate the 10-fold increment of pore volumes and 100% enhancement of methane uptake capacity of COF-320 at 100 bar and 298 K. The present findings shed light on the design of smarter organic porous materials to maximize host-guest interaction and boost gas uptake capacity through progressive structural transformation.
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Affiliation(s)
- Tengwu Zeng
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
| | - Yang Ling
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
- Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai201210, China
| | - Wentao Jiang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
| | - Xuan Yao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
| | - Yu Tao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
| | - Shan Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
| | - Huiyu Liu
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
| | - Tieying Yang
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai201210, China
| | - Wen Wen
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai201210, China
| | - Shan Jiang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
- Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai201210, China
| | - Yingbo Zhao
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
- Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai201210, China
| | - Yanhang Ma
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
- Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai201210, China
| | - Yue-Biao Zhang
- School of Physical Science and Technology, ShanghaiTech University, Shanghai201210, China
- Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai201210, China
- State Key Laboratory of Advanced Medical Materials and Devices, ShanghaiTech University, Shanghai201210, China
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