Donor‐Stabilised [SbF<sub>4</sub>]<sup>+</sup>: SbF<sub>5</sub> as a Fluoride‐Ion Donor
Bibliographic record
Abstract
Abstract Antimony pentafluoride is a strong Lewis acid and fluoride‐ion acceptor that has not previously demonstrated any discreet fluoride‐ion donor properties. The first donor‐stabilised [SbF4]+ cations were prepared from the autoionisation of SbF5 in the presence of bidentate N‐donor ligands 2,2’‐bipyridine (bipy) and 1,10‐phenanthroline (phen) as their [SbF6]− salts. The [SbF4(N−N)][Sb2F11] (N−N=bipy, phen) salts were synthesised by the addition of one equivalent of SbF5⋅SO2 to [SbF4(N−N)][SbF6] in liquid SO2. The salts show remarkable stability and were characterised by Raman spectroscopy and multinuclear NMR spectroscopy. The crystal structures of [SbF4(phen)][SbF6] ⋅ 3CH3CN and [SbF4(phen)][SbF6] ⋅ 2SO2 were determined, showing distorted octahedral cations. DFT calculations and NBO analyses reveal that significant degree of electron‐pair donation from N to Sb stabilizes [SbF4]+ with the Sb−N bond strength being approximately two thirds of that of the Sb−F bonds in these cations and the cationic charge being primarily ligand‐centred.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".