Noble‐Gas Difluoride Complexes of MOF<sub>4</sub> (M=Mo, W); Syntheses, Structures and Bonding of NgF<sub>2</sub> ⋅ MOF<sub>4</sub> and XeF<sub>2</sub> ⋅ 2MOF<sub>4</sub> (Ng=Kr, Xe)
Bibliographic record
Abstract
Abstract The NgF 2 ⋅ MOF 4 (Ng=Kr, Xe; M=Mo, W) and XeF 2 ⋅ 2MOF 4 complexes were synthesized in anhydrous HF (aHF) solvent and melts, respectively. Their single‐crystal X‐ray diffraction (SCXRD) structures show NgF 2 ⋅ MOF 4 and XeF 2 ⋅ 2MOF 4 have F t −Ng−F b ‐ ‐ ‐M arrangements, in which the NgF 2 ligands coordinate to MOF 4 through Ng−F b ‐ ‐ ‐M bridges. The XeF 2 ligands of XeF 2 ⋅ 2MOF 4 also coordinate to F 3 OM−F b ’‐ ‐ ‐M'OF 4 moieties through Xe−F b ‐ ‐ ‐M bridges to form F t −Xe−F b ‐ ‐ ‐M(OF 3 )−F b ’‐ ‐ ‐M'OF 4 , where XeF 2 coordinates trans to the M=O bond and F b ’ coordinates trans to the M’=O bond. The Ng−F t , Ng−F b , and M‐ ‐ ‐F b bond lengths of NgF 2 ⋅ n MOF 4 are consistent with MOF 4 and F 3 OM−F b ’‐ ‐ ‐M'OF 4 fluoride‐ion affinity trends: CrOF 4 <MoOF 4 <WOF 4 ≈F 3 OMo−F b ’‐ ‐ ‐Mo'OF 4 <F 3 OW−F b ’‐ ‐ ‐W'OF 4 . The [‐ ‐(F 4 OMo)( μ 3 ‐F)H‐ ‐ ‐( μ ‐F)H‐ ‐] ∞ solvate was also synthesized in aHF and characterized by SCXRD. Quantum‐chemical calculations show the M‐ ‐ ‐F b bonds of NgF 2 ⋅ MOF 4 and XeF 2 ⋅ 2MOF 4 are predominantly electrostatic, σ‐hole type bonds.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.003 | 0.003 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.005 |
| 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; both teacher heads agree on what is shown here.
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".