Methylene-Bridged Complexes of Rhodium/Ruthenium as Models for Bimetallic Fischer−Tropsch Catalysts: Comparisons with the Rh/Os and Ir/Ru Analogues
Bibliographic record
Abstract
The cationic heterobinuclear complex [RhRu(CO) 3 (μ-H) 2 (dppm) 2 ][X] ( 1 ) is prepared by protonation of the monohydride species [RhRu(CO) 3 (μ-H)(dppm) 2 ] (dppm = μ-Ph 2 PCH 2 PPh 2; X - = BF 4 -, CF 3 SO 3 - ). Treatment of 1 with carbon monoxide affords the tetracarbonyl complex ion [RhRu(CO) 4 (dppm) 2 ][X] ( 2 ), which yields the methylene-bridged product [RhRu(CO) 4 (μ-CH) 2 (dppm) 2 ][X] ( 3 ), upon treatment with excess diazomethane at −78 °C. Reaction of 3 with trimethylamine- N -oxide results in CO removal, affording the methylene-bridged tricarbonyl species [RhRu(CO) 3 (μ-CH) 2 (dppm) 2 ][X] ( 4 ). Although compound 3 is unreactive toward further treatment with CH 2 N 2, compound 4 reacts readily with diazomethane, yielding a mixture of uncharacterized products. Compounds 3 and 4 react with PMe 3 to yield [RhRu(PMe 3 )(CO) 3 (μ-CH) 2 (dppm) 2 ][X] ( 5 ), in which coordination of PMe 3 at the unsaturated Rh center occurs. The structures of compounds 2, 3, and 5 have been determined by X-ray methods. Comparisons of the reactivity of compound 3 with that of the analogous Ir/Ru and Rh/Os complexes toward diazomethane are presented.
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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 | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".