High‐pressure micro‐Raman spectroscopic study of methyltrioxorhenium(VII)
Bibliographic record
Abstract
Abstract Micro‐Raman spectra of methyltrioxorhenium(VII), CH3ReO3, were recorded at high external pressures, up to about 41 kbar, with the aid of a diamond‐anvil cell (DAC) in the presence and absence of paraffin oil (Nujol) as a pressure‐transmitting medium. The wavenumber vs external pressure plots display linear behavior up to 41 kbar, at which point sample decomposition occurs. In the case of the modes associated with the methyl group, the CH antisymmetric stretching modes are more sensitive to pressure (dν/dP = 0.88 and 1.04 cm−1 kbar−1) than the symmetric mode (dν/dP = 0.63 cm−1 kbar−1), and one branch of the split degenerate CH rocking mode exhibits a negative pressure dependence (−0.15 cm−1 kbar−1). The degeneracies of the ReO3 rocking and antisymmetric bending modes, located at 239 and 325 cm−1, respectively, at ambient pressure, are lifted in the crystal, and the resulting splitting increases as the pressure increases. The Re–C stretching vibration and one branch of the split degenerate ReO3 rocking modes are both particularly sensitive to pressure (dν/dP ≈ 0.96 cm−1 kbar−1). The dν/dP values for the ν(ReO) modes are significantly lower than those reported for other oxorhenium compounds. Copyright © 2006 John Wiley & Sons, Ltd.
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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) | 0.001 | 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".