Geometric and Electronic Structure of a<i>C</i><sub>1</sub>-Symmetric Ruthenium-Aryloxide Metathesis Catalyst: An Experimental and Computational Study
Bibliographic record
Abstract
Spectroscopic and computational methods were employed to establish the geometric and electronic structure of the Ru-pseudohalide metathesis catalyst RuCl(OC 6 Br 5 )(IMes)(py)(═CHPh) 5 (IMes = 1,3-dimesitylimidazol-2-ylidene, py = pyridine). NOESY-NMR and electronic absorption spectroscopic analysis of 5, carried out in parallel with analysis of the known trans- and cis-anionic structures RuCl 2 (IMes)(py) 2 (═CHPh) ( 3a ) and Ru( o -cat)(IMes)(py)(═CHPh) 4a ( o -cat = ortho -catecholate), confirms the trans-anionic geometry of the bromoaryloxide complex. An additional Ru···Br dative interaction is indicated by DFT analysis. The lower energy barrier to Ru−C NHC rotation vs N−C Mes rotation is demonstrated for 4a and 5 and is suggested for the corresponding dichloride catalysts. The location and intensity of the principal visible absorption band is strongly conserved for 3a and 5a and is proposed as a useful signature to facilitate identification of the trans-anionic geometry in related RuX 2 LL′(═CHPh) species.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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) | 0.000 | 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 teacher head, 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".