Volume 58, Issue 44 pp. 15742-15746
Communication

Stable 2D Heteroporous Covalent Organic Frameworks for Efficient Ionic Conduction

Zhen Xie

Zhen Xie

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

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Bo Wang

Bo Wang

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

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Zongfan Yang

Zongfan Yang

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

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Xiao Yang

Xiao Yang

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

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Prof. Xiang Yu

Prof. Xiang Yu

Analytical and Testing Center, Jinan University, Guangzhou, 510632 China

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Dr. Guolong Xing

Dr. Guolong Xing

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

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Prof. Yinghui Zhang

Prof. Yinghui Zhang

School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin, 300350 China

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Prof. Long Chen

Corresponding Author

Prof. Long Chen

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

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First published: 21 August 2019
Citations: 151

Graphical Abstract

Planarization-enhanced stability: Dibenzo[g,p]chrysene (DBC), a “closed” version of tetraphenylethene (4PE), was integrated into a 2D heteroporous imine covalent organic framework (COF). The resulting DBC-COF exhibited much better crystallinity and stability than its counterpart 4PE-COF, and is a promising host material for ionic conduction.

Abstract

Two-dimensional (2D) covalent organic frameworks (COFs) feature open and ordered one-dimensional column nanochannels which offer immense possibilities for incorporation of various guests for specific functions. However, the relatively low chemical stability of most COFs originating from the dynamic covalent linkages hinders their practical application. In this work, a highly crystalline and heteroporous dibenzo[g,p]chrysene-based COF (DBC-2P) was synthesized and served as a host material for ionic conduction. DBC-2P exhibits excellent stability both in strong acid and base due to the large conjugated DBC-based knot that reinforces the interlayer interactions. Subsequent encapsulation of linear polyethylene glycol (PEG) and PEG-LiBF4 salt into the nanochannels of DBC-2P affords a hybrid material with a high ionic conductivity of 2.31×10−3 S cm−1. This work demonstrates an efficient post-synthetic strategy for the development of new COF–polymer composites with intriguing properties.

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