Volume 60, Issue 10 pp. 5363-5369
Research Article

Polymorphism of 2D Imine Covalent Organic Frameworks

Yusen Li

Yusen Li

Department of Chemistry, Institute of Molecular Plus and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072 China

These authors contributed equally to this work.

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Linshuo Guo

Linshuo Guo

School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210 China

These authors contributed equally to this work.

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Yongkang Lv

Yongkang Lv

Department of Chemistry, Institute of Molecular Plus and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072 China

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Ziqiang Zhao

Ziqiang Zhao

Department of Chemistry, Institute of Molecular Plus and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072 China

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Prof. Yanhang Ma

Prof. Yanhang Ma

School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210 China

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Prof. Weihua Chen

Prof. Weihua Chen

College of Chemistry and Green Catalysis Center, Zhengzhou University, Henan, 450001 China

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Guolong Xing

Guolong Xing

Department of Chemistry, Institute of Molecular Plus and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072 China

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Prof. Donglin Jiang

Prof. Donglin Jiang

Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive, Singapore, 117543 Singapore

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Prof. Long Chen

Corresponding Author

Prof. Long Chen

Department of Chemistry, Institute of Molecular Plus and Tianjin Key Laboratory of Molecular Optoelectronic Science, Tianjin University, Tianjin, 300072 China

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First published: 27 November 2020
Citations: 90

Graphical Abstract

A strategy was developed for selective growth of isomeric covalent organic frameworks by designing monomer isomers and tuning reaction conditions. Three A2B2 type tetraphenyl benzene monomers (p-, m-, and o-TetPB) afford five different 2D TetPB-COF isomers that exhibit selective adsorption of vitamin B12 owing to a great difference in their pore shape and size.

Abstract

We designed and synthesized A2B2 type tetraphenyl benzene monomers (p-, m-, and o-TetPB) which have the para-, meta, and ortho-substituted isomeric structures, for the direct construction of isomeric frameworks. Interestingly, both kagome (kgm) and monoclinic square (sql) framework isomers are produced from either p-TetPB (C2h symmetry) or m-TetPB (C2v symmetry) by changing reaction solvents, while their isomeric structures are characterized by X-ray diffraction, computational simulation, microscopy, and sorption isotherm measurements. Only sql frameworks was formed for o-TetPB (C2v symmetry), irrespective of reaction solvents. These results disclose a unique feature in the framework structural formation, that is, the geometry of monomers directs and dominates the lattice growth process while the solvent plays a role in the perturbation of chain growth pattern. The isomeric frameworks exhibit highly selective adsorption of vitamin B12 owing to pore shape and size differences.

Conflict of interest

The authors declare no conflict of interest.

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