Thermal Equilibrium Between Quinoid/Biradical Forms Enhancing Electrochemical Amphotericity
Bibliographic record
Abstract
Abstract Upon dibenzo annulation on Thiele's hydrocarbon (tetraphenyl‐ p ‐quinodimethane), the quinoid form and the biradical form adopt quite different geometries, and thus are no longer resonance structures. When these two forms can interconvert rapidly due to the small energy barrier (Δ G ≠ ), the equilibrated mixture contains both forms in a ratio that is determined by the energy difference (Δ G o ) between the two forms. For a series of tetrakis[5‐(4‐methoxyphenyl)‐2‐thienyl]‐substituted derivatives, the more stable quinoid form and the metastable biradical form coexist in solution as an equilibrated mixture due to small Δ G ≠ (<15 kcal mol −1 ) and Δ G o (1–4 kcal mol −1 ), in which the proportion of the two forms can be regulated by temperature. Since the biradical form can undergo easy two‐electron (2e) oxidation to the corresponding dications as well as easy 2e‐reduction to the dianions, it exhibits very high electrochemical amphotericity. This character with a record‐small span for not only the first oxidation and reduction potentials but also the second those, [ E 1 sum ≈ E 2 sum = E 2 ox − E 2 red =ca. 1.4 V], is attained through thermally enhanced conversion to the biradical form from the corresponding quinoid form, the latter of which is less amphoteric due to higher E ox and lower E red values.
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How this classification was reachedexpand
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.002 |
| Insufficient payload (model declined to judge) | 0.002 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".