Structural Control of Band Gap and Polaron Delocalization in 2D Azatriangulene Covalent Organic Frameworks
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Bibliographic record
Abstract
New two-dimensional (2D) covalent organic frameworks (COFs) with a tri(oxa)azatriangulene (TANG) node and different polarity of the imine linkers (C═N vs N═C) and internode distance have been synthesized using a transimination polymerization. The orientation of the imine linker controls the donor–acceptor interactions in these π-conjugated COFs, resulting in a large modulation of the valence band maximum (−4.2 to −5.4 eV) and the band gap ( E g ≈ 1.2–1.6 eV). p -Doping of COFs in iodine vapor results in the formation of highly delocalized polarons with an absorption band extending into the far-infrared (THz band) region. Reducing the TANG–TANG internodal distance increases the 2D bandwidth dispersion and leads to the highest (in the series) electrical conductivity (10 –1 S/cm), the lowest conductance activation energy (50 meV near room temperature), and the most red-shifted polaron absorption (λ edge ∼ 160 μm, 8 meV) in the series.
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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 | 0.001 |
| 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) | 0.000 | 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