title: A Flexible Microporous Hydrogen-Bonded Organic Framework for Gas Sorption and Separation.
abstract: A microporous three-dimensional hydrogen-bonded organic framework (HOF-5) has been constructed from a new organic linker 4,4',4″,4‴-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 ∼21% by volume. HOF-5a shows moderately high porosity with a Brunauer-Emmett-Teller (BET) surface area of 1101 m(2)/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.
authors.affiliation: †Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States.
authors.forename: Hailong
authors.initials: H
authors.lastname: Wang
authors.affiliation: †Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States.
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.forename: Hui
authors.initials: H
authors.lastname: Wu
authors.affiliation: †Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States.
authors.forename: Tong-Liang
authors.initials: TL
authors.lastname: Hu
authors.affiliation: §College of Material Science and Engineering, Fujian Provincial Key Laboratory of Polymer Materials, Fujian Normal University, 32 Shangsan Road, Fuzhou 350007, China.
authors.forename: Zizhu
authors.initials: Z
authors.lastname: Yao
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.affiliation: §College of Material Science and Engineering, Fujian Provincial Key Laboratory of Polymer Materials, Fujian Normal University, 32 Shangsan Road, Fuzhou 350007, China.
authors.forename: Shengchang
authors.initials: S
authors.lastname: Xiang
authors.affiliation: †Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States.
authors.forename: Banglin
authors.initials: B
authors.lastname: Chen