Thorium(IV) and Uranium(IV) Thioether and Selenoether Complexes: Synthesis and An–ER<sub>2</sub> (E = S, Se) Bonding Comparison
Bibliographic record
Abstract
Reactions of the rigid thioether- and selenoether-containing ligand salts [{Li(AE 2 Ph2 )} 2 ] (E = S or Se; AE 2 Ph2 = 4,5-bis(phenylchalcogenido)-2,7,9,9-tetramethylacridanide) with ThCl 4 (dme) 2 or UCl 4 (for E = Se) afforded the actinide chalcogenoether complexes [(AE 2 Ph2 ) 2 ThCl 2 ] (E = S ( 1 ), Se ( 2 )), and [(ASe 2 Ph2 ) 2 UCl 2 ] ( 3 ). X-ray crystal structures of 1 – 3 revealed tetravalent actinide cations complexed to two κ 3 -coordinated AE 2 Ph2 ligands, with Th–ER 2 and U–ER 2 distances below the sum of the covalent radii. Complexes 1 – 3 provide extremely rare examples of thorium–thioether, thorium–selenoether, and uranium–selenoether bonds, and 1 and 2 contain the shortest known Th–SR 2 and Th–SeR 2 distances. DFT and QTAIM calculations confirm the presence of significant An(IV)–ER 2 interactions in 1 – 3 and provide insight into the extent of covalency in the An–ER 2 bonds.
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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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; 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".