Synthesis and coordination chemistry of an integrated binucleating ligand based on bidentate NacNac and NCN pincer frameworks
Bibliographic record
Abstract
A new binucleating “Janus” ligand based on the β-diketiminato (“NacNac”) donor combined with an NCN pincer ligand framework has been designed and synthesized. By incorporating pyridyl donors on the imino carbons of the NacNac ligand, two binding sites for metals are introduced. The ligand's binucleating capabilities are demonstrated by ligating BF 2 in the NacNac pocket and NiBr into the NCN pincer bay. The resulting binuclear boron–nickel complexes chemistry was explored by substitution of the bromide ligand on nickel and one fluoride ion on boron with the weakly coordinating triflimide anion [N(SO 2 CF 3 ) 2 ] − (NTf 2 ). The bromide is replaced preferentially with AgNTf 2 and further treatment with Me 3 SiNTf 2 produces a borenium ion by abstracting F − from the BF 2 unit. Semiquantitative assessment of the Lewis acidity at the nickel center using the Gutmann–Beckett method shows a substantial increase in Lewis acidity upon conversion of the BF 2 to the [BF] + borenium moiety.
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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".