Reactions of the stable bis(amino)silylene Si[{N(CH<sub>2</sub><i>t</i>Bu)}<sub>2</sub>C<sub>6</sub>H<sub>4</sub>-1,2] with group 3 or lanthanide metal organic compounds. Crystal structures of [Ln(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)<sub>3</sub>Si{[N(CH<sub>2</sub><i>t</i>Bu)]<sub>2</sub>C<sub>6</sub>H<sub>4</sub>-1,2}]·C<sub>7</sub>H<sub>8</sub> (Ln = Y or Yb)
Bibliographic record
Abstract
Treatment of the thermally stable aminosilylene Si[{N(CH 2 tBu)} 2 C 6 H 4 -1,2] [= Si(NN)] with a tris(cyclopentadienyl)- group 3 or -lanthanide metal compound LnCp 3 (Cp = η 5 -C 5 H 5 and Ln = Y or Yb) in toluene at ambient temperature afforded the first earliest transition or f-block metal-silylene complexes [LnCp 3 {Si(NN)}]·C 7 H 8 (Ln = Y (1) or Yb (2)), characterized by NMR spectroscopy and X-ray crystallography: complex 1 (monoclinic, space group P2 1 /c (no. 14), a = 15.641(5), b = 15.895(7), c = 14.876(5) Å, β = 112.93(3), Z = 4, R1 = 0.067 for 6194 observed data), and2 (monoclinic, space group P2 1 /c (no. 14), a = 15.635(3), b = 15.795(2), c = 14.842(2) Å, β = 112.87(2), Z = 4, R1 = 0.044 for 9829 observed data). The Ln atom in each of the isoleptic complexes 1 and 2 has distorted trigonal monopyramidal geometry, with the approximately trigonal silicon atom in the apical position. The Ln-Si bond length is 3.038(2) (1) or 2.984(2) Å (2). Variable temperature 29 Si{ 1 H} NMR spectra in toluene-d 8 show that each complex readily dissociates (Y > Yb) into its factors; at 188 K, the 29 Si{ 1 H} signal for (1) was a doublet centred at δ 119.5, 1 J( 29 Si- 89 Y) = 59 Hz.Key words: crystallography, NMR, silylene, yttrium, ytterbium, organometallic complexes.
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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 | 0.009 | 0.006 |
| Meta-epidemiology (narrow) | 0.019 | 0.019 |
| Meta-epidemiology (broad) | 0.019 | 0.011 |
| Bibliometrics | 0.007 | 0.017 |
| Science and technology studies | 0.009 | 0.009 |
| Scholarly communication | 0.006 | 0.010 |
| Open science | 0.017 | 0.005 |
| Research integrity | 0.012 | 0.021 |
| Insufficient payload (model declined to judge) | 0.001 | 0.002 |
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; both teacher heads agree on what is shown here.
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".