Volume 38, Issue 11 e7671
FULL PAPER

Photoactive Donor–Acceptor Covalent Organic Framework Material for Synergistic Cyclization Approach to Imidazole Derivatives

Xiaoman Sun

Xiaoman Sun

College of Chemistry, Jilin University, Changchun, P. R. China

Contribution: ​Investigation, Methodology, Formal analysis, Writing - original draft

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Qing Su

Qing Su

College of Chemistry, Jilin University, Changchun, P. R. China

Contribution: Data curation, Validation, Funding acquisition, Writing - review & editing

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Kexin Luo

Kexin Luo

College of Chemistry, Jilin University, Changchun, P. R. China

Contribution: ​Investigation, Validation, Formal analysis

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Shufang Liu

Shufang Liu

College of Chemistry, Jilin University, Changchun, P. R. China

Contribution: Software, Methodology, Visualization, Writing - original draft

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Hao Ren

Hao Ren

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, P. R. China

Contribution: Conceptualization, Software

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Qiaolin Wu

Corresponding Author

Qiaolin Wu

College of Chemistry, Jilin University, Changchun, P. R. China

Correspondence:

Qiaolin Wu ([email protected])

Contribution: Conceptualization, Supervision, Visualization, Funding acquisition, Writing - review & editing

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First published: 06 August 2024
Citations: 1

Funding: This work was supported by the National Natural Science Foundation of China (No. 51703076)

ABSTRACT

As one of the most potential platforms for heterogeneous catalysis, two-dimensional porphyrin-based covalent organic frameworks (COFs) have attracted great research interests. In this work, following the correlation of COF structure and their performance, a type of donor–acceptor 2D COF (Por-COF-Zn) based on porphyrin and thiophene units was designed and easily constructed by one-pot method using 5,10,15,20-tetra-(4-aminophenyl)porphyrin (TAPP), thieno[3,2-b]thiophene-2,5-dicarbaldehyde, and zinc acetate. The as-synthesized COF material is tested to show high crystallinity and good thermal and chemical stability. The Brunauer–Emmett–Teller (BET) measure results show that the specific surface area of Por-COF-Zn is 413.6 m2g−1, and the pore volume is 0.279 cm3g−1. Transient photocurrent response and EIS measurement also demonstrate that Por-COF-Zn exhibits an efficient separation of photogenerated electron/hole pairs. The photocatalytic performance of the resulted COF was further evaluated by using intramolecular cyclization of N-phenyl-o-phenylenediamine and benzaldehyde to form benzimidazole derivative. The catalyst system exhibited good to high conversion efficiency, moderate substrate applicability, and excellent stability and recyclability for the catalytic cyclization approach of benzimidazoles. The catalytic mechanism should be contributed to the synergistic effect of organic framework and metallic zinc. Our current work also provides valuable information for understanding COF-based photocatalytic systems and further highlight new insights to meet new challenges of heterogeneous photocatalysis.

Conflicts of Interest

The authors declare no conflicts of interest.

Data Availability Statement

The data that support the findings of this study are available in the Supporting Information of this article.

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