Designing Stability into Thermally Reactive Plumbylenes
Bibliographic record
Abstract
We complete the picture of thermally stable and volatile N- heterocyclic metallylenes with the synthesis, structural analysis, and thermal characterization of rac - N 2 , N 3 -di- tert -butylbutane-2,3-diamido lead(II) ( 1Pb ). Transamination of bis[bis(trimethylsilyl)amido] lead(II) with the free diamino ligand yields 1Pb in high yield, whereas salt-metathesis leads to oxidative cleavage of the butane backbone and production of acetaldehyde- tert- butylimine. 1Pb itself undergoes [2+2+1] cycloreversion at 150 °C to the same imine, but with a vapour pressure of 1 Torr at 94 °C a wide thermal window is available for use as a vapour deposition precursor. We contrast this with the the extreme instability of its sisters N 2 , N 3 -di- tert -butylethane-2,3-diamido lead(II) ( 2Pb ) and N 2 , N 3 -di- tert -butylethylene-2,3-diamido lead(II) ( 3Pb ), which both reductively eliminate Pb(0) at or below room temperature. This is also in start contrast to the stability of the lighter Si, Ge and Sn congeners.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.014 | 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".