XeF<sub>2</sub> Coordination Complexes of the [BrO<sub>2</sub>]<sup>+</sup> Cation, [O<sub>2</sub>Br(FXeF)<sub><i>n</i></sub>][AsF<sub>6</sub>] (<i>n</i> = 1, 2) and [O<sub>2</sub>Br(FXeF)<sub>2</sub>][SbF<sub>6</sub>]; Their Syntheses and Structural Characterizations
Bibliographic record
Abstract
The syntheses and structural characterizations of the first XeF 2 coordination complexes of the [BrO 2 ] + cation are described. The reactions of [BrO 2 ][PnF 6 ] (Pn = As, Sb) with XeF 2 in anhydrous HF solvent yield the salts [O 2 Br(FXeF) n ][AsF 6 ] ( n = 1, 2) and [O 2 Br(FXeF) 2 ][SbF 6 ], which were characterized by low-temperature (LT) Raman spectroscopy and single-crystal X-ray diffraction (SCXRD). The XeF 2 ligands and [PnF 6 ] − coordinate to the Lewis acidic [BrO 2 ] + cation through primarily electrostatic Br V ---F Xe σ-hole bonds that result from coordination of the F atoms into regions of high positive electrostatic potential on the Br(V) atom and have bond trajectories that avoid the stereoactive valence electron lone-pair of Br(V). The complexes and their structural characterizations by LT Raman spectroscopy and SCXRD significantly extend the coordination chemistry of Br(V) and provide rare examples of a noble-gas difluoride coordinated to a strong oxidant main-group Lewis acid center.
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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".