Theoretical and Structural Analysis of the Unsymmetrical Bridging Coordination Mode of the Nonconical PNR<sub>2</sub> Ligands in Ru<sub>4</sub>(CO)<sub>12</sub>(μ<sub>4</sub>-PNR<sub>2</sub>)<sub>2</sub> Clusters
Bibliographic record
Abstract
The X-ray molecular structure of Ru 4 (CO) 12 (μ 4 -PNEt 2 ) 2 exhibits a strong distortion of its octahedral Ru 4 P 2 core toward D 2 d symmetry, with a puckered Ru 4 “square” and a phosphorus coordination mode intermediate between μ 4 and μ 2 . The electronic origin of this distortion is analyzed with the help of EHT and DFT calculations. This structural peculiarity originates from the nonconical nature of the PNR 2 ligand and from the ability of the Ru 4 (CO) 12 unit to adapt its conformation and bonding ability to this unsymmetrical bonding.
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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 | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 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".