Hydrazine-based Schiff base complexes of nickel/copper(II): synthesis, molecular and supramolecular, thermal, electrochemical, antibacterial, and computational studies
Bibliographic record
Abstract
The hydrazine-based Schiff base of 2-phenyl-1-((2-hydroxy)phenylethylidene)hydrazine (HL), synthesized from 2-hydroxy-acetophenone and 1-phenylhydrazine, reacts with nickel(II) and copper(II) acetate to give bis[2-phenyl-1-((2-oxo)phenylethylidene)hydrazinato-κ2N,O]Ni/Cu(II) (1 and 2), respectively. The molecular structure for HL shows two parallel identical molecules (A and B) with opposite orientations in the asymmetric unit of the crystal. The molecules exist in the usual enol-imine form, showing an expected intramolecular O–H···N hydrogen bond between the phenolic-H and imine-N atoms. Supramolecular packing analysis further reveals a bilayer-link via an intermolecular hydrogen bond between the imine-H and phenolate-O of symmetry-related molecules of A and B. Powder X-ray diffraction patterns suggest formation of HL, 1, and 2 with distinct phases. Electron impact (EI) mass spectra show the parent ion peak at m/z = 508 (1) and 513 (2). Thermal analysis reveals a reversible phase transformation from solid crystal to isotropic liquid for HL and an irreversible transition for 1 or 2. Cyclic voltammetry results suggest an irreversible transformation of two electron charge transfer pathway for 1 and 2 in DMF. Complex 2 exhibits significant antibacterial activity, while HL reveals moderate activity against Escherichia coli and Staphylococcus aureus bacteria. Experimental results of electronic spectra and molecular structure were authenticated by computational modeling.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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".