A Flexible Microporous Hydrogen-Bonded Organic Framework for Gas Sorption and Separation

Published

August 12, 2015

Author(s)

Hailong Wang, Bin Li, Hui Wu, Tong-Liang Hu, Zizhu Yao, Wei Zhou, Shengchang Xiang, Banglin Chen

Abstract

A microporous three-dimensional hydrogen-bonded organic framework (HOF-5) has been constructed from a new organic linker 4,4'r", r"'(2,4-diamino-1,3,5-triazin-6-yl)tetraphenylethene. Activated HOF-4a exhibits a stepwise N₂ adsorption isotherm at 77 K, suggesting framework flexibility. The structure of activated HOF-5a has been established by powder X-ray diffraction studies, indicating a significant framework contraction from as-synthesized HOF-4 to activated HOF-4a of 21% by volume. HOF-5a shows moderately high porosity with a Brunauer Emmett Teller (BET) surface area of 1101 m²/g, and takes up a large amount of acetylene and carbon dioxide under ambient conditions. Powder neutron diffraction studies and theoretical calculations reveal that suitable pore sizes, curvatures, and functional sites collectively enable HOF-5a to encapsulate a high density of carbon dioxide molecules packed in a pseudo-one-dimensional array along the pore channel.

Citation

Journal of the American Chemical Society

Volume

137

Issue

31

Pub Type

Journals

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Keywords

Hydrogen-Bonded Organic Framework, porous material, gas adsorption

Citation

Wang, H. , Li, B. , Wu, H. , Hu, T. , Yao, Z. , Zhou, W. , Xiang, S. and Chen, B. (2015), A Flexible Microporous Hydrogen-Bonded Organic Framework for Gas Sorption and Separation, Journal of the American Chemical Society, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=918791 (Accessed June 1, 2024)