Maximizing Porosity and Water Sorption in Covalent Organic Frameworks via β‐Ketoenamine Linkages
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Controlling the crystallinity and porosity of 2D covalent organic frameworks (2D COFs) is crucial for their applications in science and technology. Herein, the construction of 2D COFs, COF‐TP‐ X , is reported using a multicomponent reaction strategy that introduces β‐ketoenamine linkages into isostructural imine‐linked COFs. This approach yields materials with exceptional crystallinity, stability, and tunable hydrophilicity. The integration of β‐ketoenamine linkages promotes intralayer planarity via NH⋯O hydrogen bonds and enhances π‐electronic conjugation within and between layers. By partially substituting (43 mol%) 1,3,5‐triformylbenzene with 1,3,5‐triformylphloroglucinol, an outstanding gravimetric surface area of 1,984 m 2 g −1 and a pore volume of 0.8 cm 3 g −1 are achieved—a remarkable two‐fold increase compared to mono‐linker counterparts. Moreover, COF‐TP‐ X exhibits an exceptional water uptake capacity of 0.70 g g −1 (70 wt.%) and superior hydrolytic stability, as confirmed by over 200 cycles of water adsorption–desorption experiments. Furthermore, molecular simulations reveal the significant role of electrostatic interactions between β‐ketoenamine linkages in enhancing interlayer stacking and crystallinity. The findings provide key insights into COF design via a mixed‐linker strategy, representing a significant advancement in developing COFs with superior performance and paving the way for their industrial applications.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it