Synthesis and structure of <i>N</i> -(perfluorophenyl)isonicotinamide
Bibliographic record
Abstract
The title compound [systematic name: N -(2,3,4,5,6-pentafluorophenyl)pyridine-4-carboxamide], C 12 H 5 F 5 N 2 O, crystallizes with two independent molecules ( A and B ) in the asymmetric unit in space group P 1 . The molecules adopt a conformation where the planes of the pentafluorophenyl and pyridyl rings have twist angles of 5.3 (1) and 14.5 (1)°. In the crystal, the molecules are connected by N—H...N hydrogen bonds between the amide H atom and the pyridyl nitrogen atom of an adjacent molecule to generate [ 1 10] chains of alternating A and B molecules. The packing is consolidated by C—H...π interactions, π–π stacking and C—H...O interactions and a short F...F contact of 2.7270 (13) Å occurs. The structures of related isonicotinamides are surveyed.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".