Evidence for C−H···OC Bonding in Coadsorbed Aromatic−Carbonyl Systems on Pt(111)
Bibliographic record
Abstract
The coadsorption of ethyl formate, acetone, and methyl pyruvate with benzene and naphthalene on Pt(111) was studied with reflection absorption infrared spectroscopy (RAIRS) and thermal desorption (TPD) measurements. Coadsorbed benzene or naphthalene are found to convert eta1- and eta2-states of ethyl formate and acetone into new states displaying slightly red-shifted carbonyl bands. Similarly, coadsorption converts the enediolate state of methyl pyruvate into a new adsorption geometry in which the carbonyl bands are silent. In each case, coadsorption of the aromatic leads to significantly modified carbonyl desorption spectra. The results suggest an attractive carbonyl-aromatic interaction that weakens or removes the direct interaction of the carbonyl function with the metal surface. The aromatic-carbonyl interaction is attributed to hydrogen bonding between C-H and C=O, enhanced by the chemisorption induced polarization of the aromatic.
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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 | 0.000 |
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".