Synthesis and crystal structures of tetrameric [2-(4,4-dimethyl-2-oxazolin-2-yl)anilido]sodium and tris[2-(4,4-dimethyl-2-oxazolin-2-yl)anilido]ytterbium(III)
Bibliographic record
Abstract
Reaction of 2-(4,4-dimethyl-2-oxazolin-2-yl)aniline (H 2 - L1 ) with one equivalent of Na[N(SiMe 3 ) 2 ] in toluene afforded pale-yellow crystals of tetrameric poly[bis[μ 3 -2-(4,4-dimethyl-2-oxazolin-2-yl)anilinido][μ 2 -2-(4,4-dimethyl-2-oxazolin-2-yl)aniline]tetrasodium(I)], [Na 4 (C 11 H 13 N 2 O) 4 ] n or [Na 4 (H- L1 ) 4 ] n ( 2 ), in excellent yield. Subsequent reaction of [Na 4 (H- L1 ) 4 ] n ( 2 ) with 1.33 equivalents of anhydrous YbCl 3 in a 50:50 mixture of toluene–THF afforded yellow crystals of tris[2-(4,4-dimethyl-2-oxazolin-2-yl)anilinido]ytterbium(III), [Yb(C 11 H 13 N 2 O) 3 ] or Yb(H- L1 ) 3 ( 3 ) in moderate yield. Direct reaction of three equivalents of 2-(4′,4′-dimethyl-2′-oxazolinyl)aniline (H 2 - L1 ) with Yb[N(SiMe 3 ) 2 ] 3 in toluene resulted in elimination of hexamethyldisilazane, HN(SiMe 3 ) 2 , and produced Yb(H- L1 ) 3 ( 3 ) in excellent yield. The structure of 2 consists of tetrameric Na 4 (H- L1 ) 4 subunits in which each Na + cation is bound to two H- L1 bridging bidentate ligands and these subunits are connected into a polymeric chain by two of the four oxazoline O atoms bridging to Na + cations in the adjacent tetramer. This results in two 4-coordinate and two 5-coordinate Na + cations within each tetrameric unit. The structure of 3 consists of a distorted octahedron where the bite angle of ligand L1 ranges between 74.72 (11) and 77.79 (11) degrees. The oxazoline (and anilide) N atoms occupy meridional sites such that for one ligand an anilide nitrogen is trans to an oxazoline nitrogen while for the other two oxazoline N atoms are trans to each other. This results in a significantly longer Yb—N(oxazoline) distance [2.468 (3) Å] for the bond trans to the anilide compared to those for the oxazoline N atoms trans to one another [2.376 (3), 2.390 (3) Å].
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.001 | 0.003 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| 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; 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".