A Joyful Journey: Tungsten(VI) and Tungsten(V) Fluorides Meet <i>N</i> ‐Heterocyclic Carbenes and Cyclic (Alkyl)(Amino)Carbenes
Bibliographic record
Abstract
Abstract The first complexation of tungsten(VI) fluoride with N ‐heterocyclic carbenes (NHCs) and a cyclic (alkyl)(amino) carbene (cAAC Me ) is reported, which led to formation of the complexes [(NHC)WF 6 ] (NHC = I i Pr Me , 1 ; BI i Pr, 2 ; IMes, 3 ; IDipp, 4 ; and SIDipp, 5 ) and [(cAAC Me )WF 6 ] 6 . Solid‐state structural analysis revealed distorted mono‐capped trigonal prismatic geometries for 2 and 3 , whereas 6 adopts a pentagonal bipyramidal coordination. Reduction of 1 – 6 with 0.5 equivalents of TMS‐pyr Me ‐TMS afforded rare tungsten(V) fluoride complexes [(NHC)WF 5 ] (NHC = I i Pr Me , 7 ; BI i Pr, 8 ; IMes, 9 ; IDipp, 10 ; and SIDipp, 11 ). Reduction of 6 with TMS‐pyr‐TMS yielded the dinuclear, fluoride‐bridged complex [(cAAC Me )WF 5 ] 2 12 . Subsequent addition of a second equivalent cAAC Me to 12 gave the mononuclear, seven‐coordinated bis‐carbene complex [(cAACMe) 2 WF 5 ] 13 . Magnetic susceptibility measurements and EPR spectroscopy confirm a predominantly metal‐centered d¹ radical in both 12 and 13 . These findings expand the scope of tungsten fluoride chemistry by providing rare examples of tungsten(VI) and tungsten(V) complexes stabilized by soft carbon‐donor ligands, paving the way for further exploration.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".