A NEW URANYL SHEET IN K5[(UO2)10O8(OH)9](H2O): NEW INSIGHT INTO SHEET ANION-TOPOLOGIES
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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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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".