XeOF<sub>3</sub><sup>−</sup>, an Example of an AX<sub>3</sub>YE<sub>2</sub> Valence Shell Electron Pair Repulsion Arrangement; Syntheses and Structural Characterizations of [M][XeOF<sub>3</sub>] (M = Cs, N(CH<sub>3</sub>)<sub>4</sub>)
Bibliographic record
Abstract
The XeOF(3)(-) anion has been synthesized as its Cs(+) and N(CH(3))(4)(+) salts and structurally characterized in the solid state by low-temperature Raman spectroscopy and quantum-chemical calculations. Vibrational frequency assignments for [Cs][XeOF(3)] and [N(CH(3))(4)][XeOF(3)] were aided by (18)O enrichment. The calculated anion geometry is based on a square planar AX(3)YE(2) valence-shell electron-pair repulsion arrangement with the longest Xe-F bond trans to the oxygen atom. The F-Xe-F angle is bent away from the oxygen atom to accommodate the greater spatial requirement of the oxygen double bond domain. The experimental vibrational frequencies and trends in their isotopic shifts are reproduced by the calculated gas-phase frequencies at several levels of theory. The XeOF(3)(-) anion of the Cs(+) salt is fluorine-bridged in the solid state, whereas the anion of the N(CH(3))(4)(+) salt has been shown to best approximate the gas-phase anion. Although [Cs][XeOF(3)] and [N(CH(3))(4)][XeOF(3)] are shock-sensitive explosives, the decomposition pathways for the anions have been inferred from their decomposition products at 20 degrees C. The latter consist of XeF(2), [Cs][XeO(2)F(3)], and [N(CH(3))(4)][F]. Enthalpies and Gibbs free energies of reaction obtained from Born-Fajans-Haber thermochemical cycles support the proposed decomposition pathways and show that both disproportionation to XeF(2), [Cs][XeO(2)F(3)], and CsF and reduction to XeF(2), CsF, and O(2) are favorable for [Cs][XeOF(3)], while only reduction to XeF(2) accompanied by [N(CH(3))(4)][F] and O(2) formation are favorable for [N(CH(3))(4)][XeOF(3)]. In all cases, the decomposition pathways are dominated by the lattice enthalpies of the products.
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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".