High-Potential Hypervalent Antimony(V) Porphyrin–C<sub>60</sub> Conjugates: Excitation Energy Transfer Dominates over Reductive Electron Transfer
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide High-potential hypervalent antimony(V) porphyrins have been covalently linked to the well-known electron acceptor C 60 molecule, resulting in the formation of antimony(V) porphyrin-fullerene conjugates: SbP–C 60 and SbPF 3 –C 60 . The two porphyrins, SbP and SbPF 3 contain four meso -phenyl and meso -3,4,5-trifluorophenyl units, respectively. These systems are designed to leverage the exceptionally high redox potentials of SbP and SbPF 3 to create an unusual pattern of excited state energies in a porphyrin-fullerene conjugate, in which the energy of the (porphyrin) •– –C 60 •+ state lies between the porphyrin and fullerene excited singlet states. Time-resolved spectral data show that ultrafast singlet–singlet energy transfer from the porphyrin to the C 60 unit occurs. The estimated energetics suggest that the 1 C 60 * state could be populated from porphyrin excited singlet state by either the usual Förster mechanism or by electron transfer from the C 60 unit to the excited SbP/SbPF 3 moiety followed by charge recombination. However, spectral features associated with the charge-separated state are not observed, and the energy transfer rates calculated for the Förster mechanism are in reasonable agreement with the experimental values. Thus, direct energy transfer appears to be the dominant process in these novel dyads derived from high-potential antimony(V) porphyrins.
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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) | 0.003 | 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".