CRYSTAL CHEMISTRY OF URANYL MOLYBDATES. IV. THE STRUCTURES OF M2[(UO2)6(MoO4)7(H2O)2] (M = Cs, NH4)
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Bibliographic record
Abstract
Two new uranyl molybdate hydrates, M2[(UO2)6(MoO4)7(H2O)2] (M = Cs, NH4), have been synthesized using hydrothermal methods. The crystals occur as transparent yellow needles and yellow elongate plates for M = Cs and NH4, respectively. Their structures were solved by direct methods and refined on the basis of F2 for all unique data collected with MoK X-radiation and a CCD (charge-coupled device) detector. Final R1 values are 4.1 and 3.9 % for M = Cs and M = NH4, respectively, calculated for 2178 and 2969 unique observed (|Fo | ≤ 4F) reflections, respectively. The compound Cs2[(UO2)6(MoO4)7(H2O)2] is orthorhombic, space group Pbcm, a 13.990(2), b 10.808(1), c 25.671(3) Å, V 3881.6(9) Å3, Z = 4. The compound (NH4)2[(UO2)6(MoO4)7(H2O)2] is isostructural with the Cs analogue, a 13.970(1), b 10.747(1), c 25.607(2) Å, V 3844.4(6) Å3, Z = 4. The four symmetrically independent U6+ cations in M2[(UO2)6(MoO4)7(H2O)2] are part of approximately linear (UO2)2+ uranyl ions (Ur) that are further coordinated by five ligands at the equatorial positions of uranyl pentagonal bipyramids that are capped by OUr atoms. The four symmetrically identical Mo6+ cations are tetrahedrally coordinated by O atoms. The uranyl and molybdate polyhedra link by vertex sharing to form a framework, with the low-valence M cations located in voids within the framework.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.000 |
Machine scores (provisional)
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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