Characterization of the Polymorphic Behavior of an Organic Compound Using a Dynamic Thermal and X-ray Powder Diffraction Technique
Bibliographic record
Abstract
The crystalline polymorphic forms of several samples of an organic compound produced by Dowpharma were characterized using differential scanning calorimetry (DSC); X-ray powder diffraction (XRPD); combined, simultaneous, and dynamic differential scanning calorimetry/X-ray powder diffraction (DSC/XRPD); and high performance liquid chromatography (HPLC). A total of 10 crystalline polymorphs were identified, six of which are anhydrous. Form l is a heptahydrate that reversibly converts to anhydrous Form I under dry conditions and also undergoes a reversible solid–solid phase transition at about 110 °C to convert to Form II. Form Il is anhydrous and melts at approximately 220 °C. Form III crystallizes as a hexahydrate, which reversibly converts to the monohydrate Form III and then to an anhydrous Form III above 120 °C. Anhydrous Form III melts at approximately 200 °C. Form IV crystallized as a hydrous material, which was converted to the anhydrous Form IV above approximately 60 °C, in a reversible process. Form IV appears to be unstable in high humidity conditions (e.g., 90% relative humidity at 25 °C) and slowly converts to Forms I and III. Form IV also undergoes a nonreversible solid–solid phase transition at approximately 180 °C, to form anhydrous Form V. Form V melts at approximately 245 °C. Form VI is observed only in the anhydrous state and melts at approximately 245 °C. The anhydrous nature of Form VI makes this material the most ideal crystalline material for subsequent formulation work.
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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 | 0.001 | 0.001 |
| 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 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".