Photosensitization Aspects of Pinacyanol H-Aggregates. Charge Injection from Singlet and Triplet Excited States into SnO<sub>2</sub> Nanocrystallites
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Bibliographic record
Abstract
The singlet and triplet excited-state behavior of a symmetric carbocyanine dye, 1,1‘-diethyl-2,2‘-carbocyanine (commonly referred as pinacyanol), adsorbed on SiO 2 and SnO 2 nanocrystallites has been investigated using transient absorption spectroscopy. The adsorption of the dye molecules on the negatively charged SiO 2 or SnO 2 colloids results in H-type aggregation. When excited with a 532 nm laser pulse we observe a short-lived (τ < 30 ps) singlet excited state of the H-aggregate on the SiO 2 surface. In contrast to this observation, a long-lived cation radical formation is seen on the SnO 2 surface. The dependence of the cation radical yield on the concentration of SnO 2 colloids and the intensity of laser pulse excitation confirms direct electron transfer between the excited aggregate and SnO 2 colloids. Both singlet and triplet excited states of the pinacyanol aggregate participate in the charge injection process on the SnO 2 surface with heterogeneous electron-transfer rate constants of >5 × 10 10 and 7 × 10 9 s -1, respectively. Such a charge injection process is also confirmed from the photocurrent generation at a dye-modified SnO 2 electrode. The fast reverse electron transfer between the photoinjected electron and the cation radical of the dye aggregate is considered to be a major limiting factor in achieving high photoconversion efficiencies.
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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 | 0.000 | 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 it