Synthesis, Structural, and Theoretical Analysis of Ru<sub>4</sub>(CO)<sub>12</sub>(μ-PF<sub>2</sub>)(μ<sub>4</sub>-P): Is the μ<sub>4</sub>-P Atom a Three-Electron or a Five-Electron Donor?
Why this work is in the frame
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Bibliographic record
Abstract
The X-ray molecular structure of Ru 4 (CO) 12 (μ-PF 2 )(μ 4 -P) exhibits a rather open Ru 4 butterfly with no Ru−Ru bond along the butterfly hinge, which is bridged by a μ-PF 2 ligand. The μ 4 -P atom unsymmetrically bridges the Ru 4 butterfly with two very different Ru−P−Ru angles: 148.71(15) and 95.43(10)°. The peculiar coordination mode of the μ 4 -P atom raises the question of how many electrons (three or five) it gives to the metal framework. DFT calculations on the [Ru 4 (CO) 12 (μ-PF 2 )(μ 4 -P)] 2 - /0/2+ series indicate that the phosphorus atom is better described as being a three-electron donor. Its unexpected pyramidalization is the result of atomic size and of the pinch effect of the μ-PF 2 ligand. The bonding in this cluster has been analyzed and compared to that of the related series [Ru 4 (CO) 12 (μ-PF 2 )(μ 4 -N)] 0/2+ and the [M 4 (CO) 12 (μ 4 -E)] - /3 - (M = Fe, Ru; E = N, P). A very good agreement between the optimized geometries and the available X-ray data is observed.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.003 | 0.003 |
| Meta-epidemiology (broad) | 0.005 | 0.002 |
| Bibliometrics | 0.002 | 0.007 |
| Science and technology studies | 0.001 | 0.003 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.004 |
| 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 it