用于硫酸回收的超稳定亚胺基共价有机框架：层间氢键的作用
Ultrastable Imine-Based Covalent Organic Frameworks for Sulfuric Acid Recovery: An Effect of Interlayer Hydrogen Bonding.
作者信息
Halder Arjun, Karak Suvendu, Addicoat Matthew, Bera Saibal, Chakraborty Amit, Kunjattu Shebeeb H, Pachfule Pradip, Heine Thomas, Banerjee Rahul
机构信息
Academy of Scientific and Innovative Research (AcSIR), Physical/Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-, 411008, India.
School of Science and Technology, Nottingham Trent University, Clifton Lane, NG11 8NS, Nottingham, UK.
出版信息
Angew Chem Int Ed Engl. 2018 May 14;57(20):5797-5802. doi: 10.1002/anie.201802220. Epub 2018 Apr 19.
A rapid and scalable synthesis of six new imine-linked highly porous and crystalline COFs is presented that feature exceptionally high chemical stability in harsh environments including conc. H SO (18 m), conc. HCl (12 m), and NaOH (9 m). This is because of the presence of strong interlayer C-H⋅⋅⋅N hydrogen bonding among the individual layers, which provides significant steric hindrance and a hydrophobic environment around the imine (-C=N-) bonds, thus preventing their hydrolysis in such an abrasive environment. These COFs were further converted into porous, crystalline, self-standing, and crack-free COF membranes (COFMs) with extremely high chemical stability for their potential applications for sulfuric acid recovery. The as-synthesized COFMs exhibit unprecedented permeance for acetonitrile (280 Lm h bar ) and acetone (260 Lm h bar ).
本文介绍了六种新型亚胺连接的高度多孔且结晶的共价有机框架（COF）的快速且可扩展的合成方法，这些COF在包括浓H₂SO₄（18 m）、浓HCl（12 m）和NaOH（9 m）在内的苛刻环境中具有极高的化学稳定性。这是因为在各层之间存在强的层间C-H⋅⋅⋅N氢键，这在亚胺（-C=N-）键周围提供了显著的空间位阻和疏水环境，从而防止它们在这种侵蚀性环境中水解。这些COF进一步转化为具有极高化学稳定性的多孔、结晶、自立且无裂纹的COF膜（COFM），以用于硫酸回收的潜在应用。所合成的COFM对乙腈（280 L m⁻² h⁻¹ bar⁻¹）和丙酮（260 L m⁻² h⁻¹ bar⁻¹）表现出前所未有的渗透率。
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