Photogeneration and Migration of Electrons and Holes in Zeolite NaY
Bibliographic record
Abstract
Electron transfer and charge migration between electron donors and acceptors encapsulated within dry NaY zeolites are explored using nanosecond laser flash photolysis. The role of the zeolite in these redox processes is examined in order to characterize the intrazeolite mobility of electrons and holes. Electron migration is initiated by photoexciting trans- anethole in NaY containing coadsorbed 1,4-dicyanobenzene as an electron acceptor, while hole migration is initiated by photoexciting chloranil in NaY containing coadsorbed 4,4‘-dimethoxybicumene as an electron donor. The experimental results demonstrate that ultrafast redox reactions (>10 8 s -1 ) take place, leading to long-lived charge separated species within the zeolite cavities. The efficiency of these redox processes is examined as a function of donor−acceptor concentration and the presence of nitrous oxide as an electron trap. Interpretation of the experimental data with two independent models provides evidence that the redox chemistry occurring within NaY cannot be completely accounted for by contact interactions between the incorporated molecules. From these models, it is estimated that the zeolite can mediate electron and hole migration over vacant, through-space distances of 11 and 18 Å, respectively.
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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) | 0.000 | 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 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".