Synthesis, X-ray characterization and study of new ionic complexes of 2-pyridone, obtained by oxidation with I2
Bibliographic record
Abstract
The reaction of 2-pyridone (C5H5NO or PYOH) with diiodine in molar ratios of 2∶1 and 1∶2 resulted in the formation of complexes {[(PYOH)3(PYOH)+]·I3−} (1) and {{(PYOH)6·[(PYOH)2]2+}·0.5I−·1.5I7−·I2} (2), respectively. The reactions were carried out in dichloromethane solutions in air. The compounds were characterized by elemental analysis, DTA-TGA chromatography, FT-Raman, FT-IR, UV-vis and EPR spectroscopies. Crystal structures of the named complexes have been determined by X-ray diffraction at 120(1) K (1) and 293(2) K (2). Compound 1, [(C20H20N4O4)I3], monoclinic, space group C2/c, consists of a cationic PYOH+ radical species and an I3− counter anion; three neutral PYOH molecules are also bound to the complex. The crystal structure of [(C40H40N8O8)I13] (2) reveals a centrosymmetric P-1 triclinic space group containing two cationic PYOH+ species, with the anionic counterparts being one half I− and three halves I7−. Also, a neutral diiodine molecule I2 is retained by weak halogen-halogen interactions to I−, as well as six neutral PYOH ligands. The structures of 1 and 2 consist of hydrogen-bonded pyridine layers; polyiodide fragments fill the spaces between the layers, additionally kept together by a number of weak C–H⋯I interactions.
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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".