The ReOs<sub>4</sub>(μ-H)(CO)<i><sub>n</sub></i>(<i>n</i>= 19, 18, 16) Clusters
Bibliographic record
Abstract
Addition of Re(CO) 5 (H) to Os 4 (CO) 14 in solution at room temperature affords ReOs 4 (μ-H)(CO) 19 ( 1 ). Careful pyrolysis of 1 in hexane at 85 °C initially yields ReOs 4 (μ-H)(μ-CO)(CO) 17 ( 2 ), which on further heating gives ReOs 4 (μ-H)(CO) 16 ( 3 ). There was no evidence for ReOs 4 (μ-H)(CO) 17 . The four osmium atoms in 1 have a planar kite arrangement with the Re(CO) 5 in an equatorial site, that is, a spiked kite metal skeleton. The H ligand is believed to bridge the OsOs bond (length 2.892(1), 2.904(1) Å; two independent molecules) that is cis to the Re atom, rather than one of the longer OsOs bonds. Cluster 2 has a distorted tetrahedral Os 4 nucleus with the Re(CO) 5 again acting as a spike ligand (i.e., a spiked tetrahedral metal skeleton). Compound 3 has the expected trigonal bipyramidal core of metal atoms with the Re(CO) 4 unit in the equatorial plane. The structures of 1 − 3 are compared to those of the analogous Os 5 (CO) n ( n = 19, 18, 16) clusters. The solution behavior of the new clusters was also investigated by variable-temperature 13 C NMR spectroscopy.
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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".