Ding Jiehua, Guan Xinyu, Chen Xiaohong, Nan Pihan, Qiu Shilun, Fang Qianrong
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Department of Chemistry, Jilin University, Changchun, 130012, China.
Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
Chemistry. 2023 Dec 1;29(67):e202302290. doi: 10.1002/chem.202302290. Epub 2023 Oct 18.
The design and synthesis of covalent organic frameworks (COFs) with high chemical stability pose significant challenges for practical applications. Although a growing number of robust COFs have been developed and employed for a broad scope of applications, the assessment of COF stability has primarily relied on qualitative descriptions, lacking a rational and quantitative assessment. Herein, a novel assessment method is presented that enables visual and quantitative depiction of COF stability. By analyzing the PXRD patterns of chemically stable β-ketoenamine-based COFs (KEA-COFs), two crystallinity-dependent parameters are identified, the relative intensity (I ) and the relative area (A ) of the main peak (2θ), which are expected to establish a standardized criterion for assessing COF crystallinity. Based on these parameters, the crystalline changes after stability tests can be visually presented, which provides a rational and quantitative assessment of their stability. This study not only demonstrates the remarkable chemical stability of KEA-COFs, but also provides valuable insights into the quantitative evaluation of COFs' crystallinity and stability.
设计和合成具有高化学稳定性的共价有机框架（COF）对实际应用构成了重大挑战。尽管已经开发出越来越多坚固的COF并将其应用于广泛的领域，但对COF稳定性的评估主要依赖于定性描述，缺乏合理的定量评估。在此，提出了一种新颖的评估方法，能够对COF稳定性进行可视化和定量描述。通过分析化学稳定的基于β-酮烯胺的COF（KEA-COF）的粉末X射线衍射（PXRD）图谱，确定了两个与结晶度相关的参数，主峰（2θ）的相对强度（I）和相对面积（A），有望建立一个评估COF结晶度的标准化标准。基于这些参数，可以直观地呈现稳定性测试后的晶体变化，从而对其稳定性进行合理的定量评估。本研究不仅证明了KEA-COF具有出色的化学稳定性，还为COF结晶度和稳定性的定量评估提供了有价值的见解。
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