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Quantitative Assessment of Crystallinity and Stability in β‐Ketoenamine‐Based Covalent Organic Frameworks

Von Wiley-VCH zur Verfügung gestellt

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, we for the first time present a novel assessment method that enables visual and quantitative depiction of COF stability. By analyzing the PXRD patterns of chemically stable β-ketoenamine-based COFs (KEA-COFs), we establish two crystallinity-dependent parameters, the relative intensity (I2θrel) and the relative area (A2θrel) 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.

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