Information critical for social work practitioners in the decision making process: An empirical study of implicit knowledge using naturalistic decision making perspective
Bibliographic record
Abstract
The synthesis, characterization, and solid-state structure of bulky alkoxy- and aryloxy-supported yttrium polynuclear hydrides are reported. Hydrogenolysis of the supertrityl alkoxy anchored yttrium dialkyl, Y(OTr*)(CH<sub>2</sub>SiMe<sub>3</sub>)<sub>2</sub>(THF)<sub>2</sub> (<b>1</b>) (Tr* = tris(3,5-di-<i>tert</i>-butylphenyl)methyl), resulted in the clean conversion to the tetranuclear dihydride, [Y(OTr*)H<sub>2</sub>(THF)]<sub>4</sub> (<b>1a</b>). X-ray analysis revealed a highly symmetrical structure (<b>4</b>̅ site symmetry) with the four Y atoms located on the corners of a compressed tetrahedron, each bonded to an OTr* and tetrahydrofuran (THF) ligand and the cluster held together by four face-capping, μ<sub>3</sub>-H, and four edge-bridging, μ<sub>2</sub>-H, hydrides. DFT calculations on the full system with and without THF, but also on model systems, clearly show that the structural preference for complex <b>1a</b> is controlled by the presence and coordination of THF molecules. Contrary to the exclusive formation of the tetranuclear dihydride, hydrogenolysis of the bulky aryloxy yttrium dialkyl, Y(OAr*)(CH<sub>2</sub>SiMe<sub>3</sub>)<sub>2</sub>(THF)<sub>2</sub> (<b>2</b>) (Ar* = 3,5-di-<i>tert</i>-butylphenyl) gave a mixture of the analogous tetranuclear <b>2a</b> and trinuclear, [Y<sub>3</sub>(OAr*)<sub>4</sub>H<sub>5</sub>(THF)<sub>4</sub>], polyhydride, <b>2b</b>. Similar results, i.e., a mixture of tetra-/tri-nuclear products, were obtained from hydrogenolysis of the even bulkier Y(OAr<sup>Ad2,Me</sup>)(CH<sub>2</sub>SiMe<sub>3</sub>)<sub>2</sub>(THF)<sub>2</sub> compound. Experimental conditions were established to optimize the production of either the tetra- or trinuclear products. X-ray structure of <b>2b</b> revealed a triangular array of three yttrium atoms with two face-capping μ<sub>3</sub>-H and three edge-bridging μ<sub>2</sub>-H hydrides, with one yttrium bonded to two aryloxy ligands while the other two have a complement of one aryloxy and two THF ligands; the solid-state structure is close to being C<sub>2</sub> symmetric, with the C<sub>2</sub> axis running through the unique Y and unique μ<sub>2</sub>-H hydride. As opposed to <b>2a</b>, which shows distinct <sup>1</sup>H NMR resonances for μ<sub>3</sub>/ μ<sub>2</sub>-H (δ = 5.83/6.35 ppm, respectively), no hydride signals for <b>2b</b> were observed at room temperature, indicating hydride exchange on the NMR time scale. Their presence and assignment were secured at -40 °C from <sup>1</sup>H SST (spin saturation) experiment.
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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 | 0.001 | 0.006 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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".