Dinitrogen Binding and Silylation by Bis(ketimino)carbazolide Complexes of Iron and Cobalt
Bibliographic record
Abstract
We report the coordination chemistry of a bulky 1,8-bis(ketimino)carbazole (HL) ligand and the reactivity of the corresponding iron(II) and cobalt(II) chloride complexes [LFeCl] ( 1) and [LCoCl] ( 2 ). Upon one-electron reduction of 1 and 2 under a dinitrogen atmosphere, N 2 binds to the reduced metal centers to generate the corresponding square planar Fe(I) and Co(I) complexes [LFe(N 2 )] ( 3 ) and [LCo(N 2 )] ( 4·N 2 ), respectively. While further reduction of 3 generates the formally Fe(0) species [LFe(N 2 )] −, the reduction of 4·N 2 affords a three-coordinate [LCo(0)] complex ( 7 ) with the loss of N 2 from the metal center. Density functional theory (DFT) calculations suggest noninnocent behavior of the ligand. Both 3 and 4 can catalyze the silylation of N 2 using the combination of KC 8 and Me 3 SiCl reagents to produce N(SiMe 3 ) 3, where low temperature and batch addition significantly improve the yields to up to 52%.
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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) | 0.000 | 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) | 0.000 | 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".