共价有机骨架
热稳定性
共价键
魔角纺纱
红外光谱学
吸附
傅里叶变换红外光谱
吸附
化学
材料科学
化学工程
物理化学
有机化学
核磁共振波谱
工程类
作者
Ke Xu,Robert Oestreich,Takin Haj Hassani Sohi,Mailis Lounasvuori,Jean G. A. Ruthes,Yunus Zorlu,Philipp Seiffert,Till Strothmann,Patrik Tholen,Markus Suta,Volker Presser,Tristan Petit,Christoph Janiak,Jens Beckmann,Jörn Schmedt auf der Günne,Gündoğ Yücesan
标识
DOI:10.26434/chemrxiv-2024-jfg84
摘要
Herein, we report a new family of covalent organic frameworks (COFs), namely pyrophosphonate-COFs, constructed via pyrophosphonate linkages. Pyrophosphonate-COFs can be synthesized via a single-step condensation reaction of the charge-assisted hydrogen-bonded organic framework (HOF) GTUB5, which is constructed from phenylphosphonic acid and 5,10,15,20‐tetrakis[p‐phenylphosphonic acid] porphyrin. The reported pyrophosphonate-COF, which we call GTUB5-COF was synthesized by simply heating its two-linker HOF precursor GTUB5 without using chemical reagents. GTUB5-COF exhibits good water and water vapor stability during the gas sorption measurements. Furthermore, GTUB5-COF exhibits exceptional electrochemical stability in 0.5 M Na2SO4 electrolyte in water. The formation of pyrophosphonate bonds upon heating was confirmed by magic angle spinning nuclear magnetic resonance spectroscopy, Fourier-transform infrared spectroscopy, and mass spectrometry coupled with thermal analysis. The condensed product pyrophosphonate-COF can efficiently adsorb CO2. It has a more favorable heat of adsorption value for CO2 capture at lower pressures than water vapor, making it a suitable candidate for selective CO2 capture in the presence of water vapor. The absorption and emission of GTUB5-COF are governed by localized transitions (Soret and Q bands) within the porphyrin unit, which results in broad-banded fluorescence in the near-infrared range at around 800 nm.
科研通智能强力驱动
Strongly Powered by AbleSci AI