Bimolecular Extrusion of TeR<sub>2</sub> from β-Diketiminato Supported Scandium Bis-tellurolates
Bibliographic record
Abstract
Reaction of the well-defined, base-free dialkyl scandium compounds LnSc(CH2SiMe3)2 supported by the β-diketiminato ligands ArNC(R)CHC(R)NAr (Ar=2,6-diisopropyl; R=Me, L1; R=tBu, L2) with two equivalents of nBu3P=Te gives the bis-tellurolate complexes LnSc(TeCH2SiMe3)2, 1 b (L1) and 2 b (L2). Tellurolate 2 b was isolated and fully characterized, including an X-ray structure analysis, and exhibits two chemically distinct tellurolate ligands in solution on the NMR time scale. Tellurolate 1 b is only moderately stable and decomposes with elimination of two equivalents of Te(CH2SiMe3)2 to form the dimeric bis-telluride 1 d. This compound was characterized by X-ray crystallography and elemental analysis. In contast, tellurolate 2 b decomposes with loss of only one equivalent of Te(CH2SiMe3)2, leading to the formation of a dinuclear complex with one bridging telluride unit joining two L2Sc(TeCH2SiMe3) fragments. This compound was also structurally characterized. The solution behavior of this material is complex, as it exists as three conformational isomers that undergo slow exchange on the NMR time scale. The production of dimer 2 c, along with the results of crossover experiments, suggest strongly that TeR2 elimination from these bis-tellurolates is bimolecular.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.130 | 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".