Solution Multi-NMR and Raman Spectroscopic Studies of Thermodynamically Unstable XeO<sub>4</sub>. The First<sup>131</sup>Xe NMR Study of a Chemically Bound Xenon Species
Bibliographic record
Abstract
Xenon tetroxide is thermodynamically unstable, decomposing explosively in the gas phase and in the solid state. A modified and more detailed description of the procedure for the preparation of XeO(4) and its solutions is provided. Xenon tetroxide dissolves in SO(2)ClF, BrF(5), and HF solvents, giving solutions that are kinetically stable up to -30 degrees C. The preparation of kinetically stable XeO(4) solutions lays the groundwork for the solution chemistry of XeO(4) and for the extension of the presently limited chemistry of xenon(VIII). The (129)Xe and (17)O NMR spectra of XeO(4) were observed for the first time, and the tetrahedral symmetry of XeO(4) allowed for the observation of a surprisingly narrow (131)Xe resonance, the first (131)Xe NMR study of a xenon compound. A variable temperature and variable field strength study of the spin-lattice relaxation times for (129)Xe and (131)Xe show that the spin-rotation and the quadrupolar relaxation mechanisms, respectively, are dominant. The Raman spectrum of XeO(4) in anhydrous HF solvent confirms the absence of significant solvent-solute interactions.
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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) | 0.001 | 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".