Hydrothermal preparation and characterization of a rare example of sodium tetracarboxylate polymer with bridging water
Bibliographic record
Abstract
A 3D coordination polymer, Na 2 (μ 8 -btaH 2 )(μ 2 -H 2 O) 2n (1) (btaH 4 = benzene-1,2,4,5-tetracarboxylic acid) was hydrothermally synthesized and characterized by elemental analysis and Xray diffraction studies. Compound 1 crystallizes in the triclinic P–1 space group. The Na + ions are linked together with μ 8 -btaH 2 2− and μ 2 -H 2 O bridging ligands. The btaH 2 2− units are bound to eight Na + ions. The Na atoms are seven-coordinate with three oxygen atoms of three individual btaH 2 2− ions, two oxygen atoms form one bidentate btaH 2 2− ligand, and two oxygen atoms from bridging water molecules. An interesting intramolecular hydrogen bond is present between protonated and deprotonated carboxylate groups (O4–H···O2). Its length is 2.3991(17) Å with 172(2)° angle and the proton is located near the center of the bond (O4–H 1.11(3) Å and H···O 1.29(3) Å).
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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 | 0.000 | 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 | 0.000 | 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".