A Copper Complex of a Noninnocent Iminophenol‐Amidopyridine Hybrid Ligand: Synthesis, Characterization, and Aerobic Alcohol Oxidation
Bibliographic record
Abstract
Abstract Reaction of the noninnocent iminophenol‐iminopyridine hybrid ligand HL IPIP , where L IPIP denotes [2‐(( E )‐{( E )‐2‐[( E )‐pyridin‐2‐ylmethyleneamino]benzylidene}amino)‐4,6‐di‐ tert ‐butylphenolate], with copper acetate afforded a copper complex, L APIP Cu II , in which one of the imine functional groups is oxidized to an amide during metal complexation. The new Cu II complex is capable of catalyzing efficient aerobic alcohol oxidation under mild conditions. The crystal structure of L APIP Cu II exhibits a square‐planar geometry with the Cu II center coordinated by three nitrogen atoms and one oxygen atom. Electrochemical studies were conducted to evaluate the redox‐active behavior of the complex, and the results showed a quasireversible reduction and a ligand‐based oxidation process. The neutral species of L APIP Cu II is EPR active, which is consistent with a paramagnetic electronic ground state (d 9 , S = 1/2), whereas the one‐electron oxidized complex was X‐band EPR silent. One‐electron chemical oxidation of L APIP Cu II gave a new species that can be attributed to a Cu II ‐phenoxyl radical complex. Based on EPR measurements in conjunction with density functional theory calculations, [L APIP Cu II ] + is proposed to have a triplet electronic ground state, exhibiting a weak ferromagnetic interaction between the Cu II center and the coordinated phenoxyl radical.
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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 | 0.001 |
| 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) | 0.002 | 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".