Structural Comparison of Lithium Iodide Complexes of Symmetrical and Unsymmetrical [CH2(PPh2NSiMe3)(PPh2NR)](R = SiMe3, H) Ligands
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Bibliographic record
Abstract
Compounds [(LiI)1] and [(LiI)2]2 crystallize in the centrosymmetric space group P21/n. They are made up of neutral ligands [H2C(PPh2NSiMe3)2] (1) and [H2C(PPh2NSiMe3)(PPh2NH)] (2) and a LiI molecule. In both cases, N,N chelation with lithium is observed. Ligand 2 contains two different nitrogen centres viz., P=N(SiMe3) and P=N(H), which are coordinated unsymmetrically to lithium (Li–N = 2.055(8) and 2.072(8) Å) to form [{LiI}{CH2(PPh2NSiMe3)×(PPh2NH)}] as monomer units that are linked via intermolecular coordination between NH and Li (2.097(8) Å) to form a central four-membered ring, Li2N2 with four-coordinate lithium atoms. In contrast, [(LiI)1] is monomeric with a three-coordinate lithium centre. This disparity is reflected in the Li–I bond distances (2.699(11) Å for [(LiI)1] and 2.824(7) Å) for [(LiI)2]2). The dimer [(LiI)2]2 displays intramolecular Csp3H–π and intermolecular Csp2H–π interactions (between phosphorus-substituted phenyl groups).
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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 it