Intercalation and Complexation of Co(II) and Ni(II) by Chelating Ligands Incorporated in Zn-Al Layered Double Hydroxides
Bibliographic record
Abstract
Zn,Al layered double hydroxides (LDHs) intercalated by a series of organic chelating ligands (L), including anionic ethylenediamine-N,N-diacetate (EDDA), nitrilotriacetate (NTA), ethylenediaminetetraaetate (EDTA), and diethylenetriaminepentaacetate (DTPA) as guests, were prepared by co-precipitation and anion exchange of precursor Zn,Al-NO3 LDHs. The chelation of transition metal ions (Co 2+ and Ni 2+ ) from aqueous solution and the intercalation of pre-formed complexes of the type (M(edda)) 2- , (M(nta)) - , (M(edta)) 2- and (M(dtpa)) 3- , have been investigated. Powder X-ray diffraction (PXRD) showed that the basal spacing increased from 9.0 A for the precursor materials to 12.0-15.3 A for the pillared hybrids. Elemental analysis and FT-IR spectroscopy indicated that most of the interlayer nitrate anions were displaced by L anions to form LDHs-L, which then reacted with the metal ions to form (M(L)) n- complexes between the LDHs layers. The compounds were studied by thermal gravimetric (TG) and differential thermal analysis (DTA).
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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 | 0.000 | 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 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".