A Flexible Microporous Hydrogen-Bonded Organic Framework for Gas Sorption and Separation
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- 作者：Hailong Wang ; Bin Li ; Hui Wu ; Tong-Liang Hu ; Zizhu Yao ; Wei Zhou ; Shengchang Xiang ; Banglin Chen
- 刊名：Journal of the American Chemical Society
- 出版年：2015
- 出版时间：August 12, 2015
- 年：2015
- 卷：137
- 期：31
- 页码：9963-9970
- 全文大小：623K
- ISSN：1520-5126
文摘
A microporous three-dimensional hydrogen-bonded organic framework (HOF-5) has been constructed from a new organic linker 4,4鈥?4鈥?4鈥?tetra(2,4-diamino-1,3,5-triazin-6-yl)tetraphenylethene. Activated HOF-5a 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-5 to activated HOF-5a of 鈭?1% by volume. HOF-5a shows moderately high porosity with a Brunauer鈥揈mmett鈥揟eller (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.