Citation: Jiahao Li, Guinan Chen, Chunhong Chen, Yuanyuan Lou, Zhihao Xing, Tao Zhang, Chengtao Gong, Yongwu Peng. Modulated synthesis of stoichiometric and sub-stoichiometric two-dimensional covalent organic frameworks for enhanced ethylene purification[J]. Chinese Chemical Letters, ;2025, 36(1): 109760. doi: 10.1016/j.cclet.2024.109760 shu

Modulated synthesis of stoichiometric and sub-stoichiometric two-dimensional covalent organic frameworks for enhanced ethylene purification

Jiahao Li ^{a, 1} ,
Guinan Chen ^{a, 1} ,
Chunhong Chen ^{b, 1} ,
Yuanyuan Lou ^a ,
Zhihao Xing ^a ,
Tao Zhang ^a ,
Chengtao Gong ^a ,
Yongwu Peng ^{a, *,}

a.
College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China
b.
State Key Laboratory of Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China

ywpeng@zjut.edu.cn

Received Date: 14 November 2023
Revised Date: 28 February 2024
Accepted Date: 10 March 2024
Available Online: 12 March 2024

Figures(4)

Controlled synthesis of two-dimensional covalent organic frameworks (2D COFs), including stoichiometric and sub-stoichiometric variations, is a topic of growing interest due to its potential in gas separation applications. In this study, we successfully synthesized three distinct 2D COFs by carefully adjusting solvent compositions and monomer ratios during the synthesis of [4 + 4] type COFs. These included a stoichiometric [4 + 4] type COF and two sub-stoichiometric [4 + 2] type COFs, featuring unreacted amino or formyl groups. The resulting COFs exhibit different gas adsorption and separation properties. Specifically, sub-stoichiometric COF-DA with residual amino groups shows comparable adsorption capacity for C₂H₂, C₂H₄, and CO₂ to stoichiometric COF-DAPy. In contrast, sub-stoichiometric COF-Py with residual formyl groups displays enhanced adsorption selectivity for C₂H₂/C₂H₄ and C₂H₂/CO₂ separation, with the C₂H₂/C₂H₄ selectivity being the highest among reported COFs, attributed to increased pore polarity resulting from the presence of formyl groups. This study not only offers an additional example of sub-stoichiometric COF synthesis but also advocates for further exploration of sub-stoichiometric COF materials, particularly in the field of gas adsorption and separation.
- Two-dimensional covalent organic frameworks,
- Stoichiometric and sub-stoichiometric,
- Residual functional groups,
- Ethylene purification
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