Indophenine Reaction as a Method for Synthesizing Conjugated Polymers with Sub-1 eV Optical Bandgaps
Bibliographic record
Abstract
Traditionally, conjugated polymer syntheses have relied heavily on metal-catalyzed cross-coupling reactions. These cross-couplings require appropriately functionalized monomers, increasing the length and complexity of the overall synthesis; in addition, some of the commonly used reagents (e.g., trialkyltin chlorides) are highly toxic. Even after a polymer has been successfully prepared, residual metal impurities can also compromise its optoelectronic properties and performance in devices. As such, there is a demand for metal-free approaches to conjugated polymer synthesis. In this work, the indophenine reaction was used to polymerize thiophene and bifunctional isatin comonomers, with only sulfuric acid used as the catalyst. The structural influence of the comonomers was evaluated using different thiophenes and bifunctional isatins. The resulting polymers have very wide absorption bands that span the UV/vis/NIR regions, with optical bandgaps as low as 0.76 eV. The polymers show electrochromic behavior, as determined through spectroelectrochemical measurements.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 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 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".