Novel Soluble and Fluorescent Poly(arylene ether)s Containing <i>p</i>-Quaterphenyl, 2,5-Bis(4-phenylphenyl)oxadiazole, or 2,5-Bis(4-phenylphenyl)triazole Groups
Bibliographic record
Abstract
Three novel conjugated biphenols 3, 4, and 8 were synthesized by the Pd(OAc) 2 -catalyzed regioselective carbon−carbon coupling reaction of 2,6-di- tert -butylphenol or 2-phenylphenol with aryl halides. Although poly(arylene ether)s derived from biphenol 3 and arylene difluorides have low solubility in organic solvents, using 4,4‘-(9-fluorenylidene)diphenol or 4,4‘-(hexafluoroisopropylidene)diphenol as a comonomer gave soluble poly(arylene ether)s 6a − c . High molecular weight poly(arylene ether)s 7a ‘ − c ‘ were also prepared from biphenol 4 . The biscarbamate-masked monomers 5 and 9 improved the polymerization to give higher molecular weight polymers 7a − e and 10a − e in higher yields. Polymers 7 and 10 possess better film-forming capabilities and are still soluble in organic solvents. Polymers 6, 7, and 10 are all thermally stable with 5% weight loss temperatures higher than 500 °C under nitrogen. The polymers show strong blue light emission ranging from 387 to 478 nm in solution, depending on the conjugated structure.
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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) | 0.000 | 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 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".