Porphyrin-Based Polyesters Synthesized by Enzymatic Catalysis
Bibliographic record
Abstract
The photochemical and photophysical properties of porphyrins and their derivatives make them useful materials in catalysis, photovoltaics, and biomedicine. The range of applications may be broadened through the synthesis of porphyrin-containing polymers. Polymers based on porphyrins may be prepared by radical polymerization and coupling reactions such as esterification, amidation, and click chemistry. In this work, we demonstrate the successful synthesis of polyesters containing porphyrin moieties in the backbone using Candida antarctica lipase B (CALB) as a catalyst in a two-step methodology comprising ring-closure and ring-opening reactions. The enzymatic reactions were facilitated by the addition of tri(ethylene glycol) spacers to circumvent the bulkiness of the prophyrinic structure in the substrates. A tetraphenylporphyrin-based macrocyclic lactone was first synthesized and characterized and then polymerized to yield polyesters with good thermal stability and optical properties similar to those of their porphyrinic precursors. Films may be cast from the polymers dissolved in organic solvents. The thermal and mechanical properties of the polyesters have been studied.
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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 | 0.001 |
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".