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RESEARCH PRODUCT
Pressure-Stabilized Solvates of Xylazine Hydrochloride
Anna OlejniczakKristı̅ne Kru̅kle-be̅rziņaAndrzej Katrusiaksubject
Active ingredientPhase transitionChemistryHydrochloride02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciencesXylazine Hydrochloride0104 chemical sciencesSolventCrystallographychemistry.chemical_compoundHigh pressureYield (chemistry)General Materials Science0210 nano-technologyHydratedescription
High pressure strongly favors the highest-density polymorph Z of active pharmaceutical ingredient 2-(2,6-xylidino)-5,6-dihydro-4H-1,3-thiazine hydrochloride (xylazine hydrochloride, XylHCl) up to about 0.1 GPa only, but still higher pressure destabilizes this structure. Above 0.1 GPa, XylHCl preferentially crystallizes as solvates with CH2Cl2, CHCl3, or (CH3)2CHOH depending on the solvent used. However, when XylHCl·H2O is dissolved in any of these solvents, the high-pressure crystallizations yield the hydrate XylHCl·H2O only. The single crystals of the CH2Cl2, CHCl3, and (CH3)2CHOH solvates could be grown in situ in a diamond anvil cell, which allowed their structure determination from the single-crystal diffraction data. At 0.4 GPa the XylHCl·H2O hydrate undergoes a pressure-induced phase transition doubling the unit cell dimensions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2016-06-14 | Crystal Growth & Design |