A NEW URANYL SHEET IN K5[(UO2)10O8(OH)9](H2O): NEW INSIGHT INTO SHEET ANION-TOPOLOGIES
Why this work is in the frame
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Bibliographic record
Abstract
The structure of K 5 [(UO 2 ) 10 O 8 (OH) 9 ](H 2 O), Z = 4, monoclinic, space group Pn , a 13.179(2), b 20.895(4), c 13.431(3) A, β 106.316(3)°, has been solved and refined to R = 7.8% and a goodness-of-fit of 0.82 for 4349 unique observed (F o ≥ 4σ F ) reflections collected for a synthesized crystal using Mo K α X-radiation and a CCD detector. The structure is dominated by previously unknown sheets of edge- and vertex-sharing uranyl polyhedra parallel to (100), with K cations and H 2 O groups in the interlayer. The sheets contain 20 symmetrically distinct U 6+ cations, each of which is associated with an approximately linear (UO 2 ) 2+ uranyl ion ( Ur ), and is coordinated by four or five additional anions at the equatorial positions of square (2 polyhedra) and pentagonal (18 polyhedra) bipyramids, respectively. As is the case with other sheets of uranyl polyhedra, the anion topology of the sheet can be generated using a chain-stacking sequence; however, the sequence is unique and for the first time involves the occurrence of P chains flanked by U or D chains of opposite directional sense. This example serves to further demonstrate the structural complexity that is possible in sheets of uranyl polyhedra.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.014 | 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 it