Co(II) Amide, Pyrrolate, and Aminopyridinate Complexes: Assessment of their Manifold Structural Chemistry and Thermal Properties**
Bibliographic record
Abstract
Abstract A series of cobalt(II) (silyl)amides, pyrrolates and aminopyridinates were synthesized. Inspired by the dimeric bis(trimethylsilylamido)cobalt(II) complex ([Co(TMSA) 2 ] 2 ), facile salt metathesis employing the ligand 2,2,5,5‐tetramethyl‐1,2,5‐azadisilolidinyl (TMADS) yielded its congener [Co(TMADS) 2 ] 2 . Novel, heteroleptic Lewis adducts of the former resulted in unusual three‐ to four‐fold coordination geometry around the metal center. Similarily, the salt [Li(DAD) 2 ][Co(TMADS) 3 ] was isolated which demonstrates an ion separated Co(II) anion with silylamide ligation and Li + counter cation. Transpyrrolylation using [Co(TMSA) 2 ] 2 was established for the synthesis of bis[N,N’‐2‐(dimethylaminomethyl)pyrrolyl]cobalt(II), and bis(N‐2‐( tert ‐butyliminomethyl)pyrrolyl)cobalt(II). Treatment of CoCl 2 with two equivalents of lithiated N,N‐dimethyl(N’‐ tert ‐butyl)ethane‐1‐amino‐2‐amide and N,N‐dimethyl(N’‐trimethylsilyl)ethane‐1‐amino‐2‐amide resulted in the respective Co(II) amido‐amines. Reaction of CoCl 2 with lithium 4‐methyl‐N‐(trimethylsilyl)pyridine‐2‐amide yielded the first binuclear, homoleptic Co(II) aminopyridinate complex with a distorted trigonal bipyramidal coordination environment (τ 5 =0.533) for one central Co(II) ion and a weakly distorted tetrahedral coordination geometry (τ 4 =0.845) for the other. All of the new compounds were thoroughly characterized in terms of composition and structure. Finally, the key thermal characteristics of volatility and thermal stability were assessed using a combination of thermogravimetric analysis and complementary bulk sublimation experiments.
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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) | 0.001 | 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 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".