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Preparation of Binary and Ternary Deep Eutectic Systems
Published on: October 31, 2019
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Vitrification and New Phases in the Water:Pyrimidine Binary Eutectic System.
Ewa Patyk-Kaźmierczak1, Marcin Podsiadło1, Marek Szafrański2
1Department of Materials Chemistry, Faculty of Chemistry , Adam Mickiewicz University , Uniwersytetu Poznańskiego 8 , 61-614 Poznań , Poland.
The Journal of Physical Chemistry. B
|July 31, 2019
Summary
The pyrimidine-water binary diagram was mapped, revealing a eutectic point and novel crystalline phases. This research aids understanding pyrimidine
Area of Science:
- Physical Chemistry
- Materials Science
- Crystallography
Background:
- Pyrimidine and its derivatives are prevalent in biological systems and pharmaceuticals.
- Understanding their behavior in aqueous environments is crucial for various applications.
- Hygroscopic nature of pyrimidine necessitates studies on its interactions with water.
Purpose of the Study:
- To determine the phase diagram of pyrimidine:water mixtures.
- To identify and characterize novel crystalline and amorphous phases formed.
- To provide insights into the thermodynamic behavior of pyrimidine in humid conditions.
Main Methods:
- Differential scanning calorimetry (DSC).
- In situ single-crystal X-ray diffraction.
- Powder X-ray diffraction (PXRD).
Main Results:
- The pyrimidine-water binary diagram was established, with a eutectic point near a 1:4 molar ratio at 234.5 K.
- Eutectic and near-eutectic mixtures exhibit vitrification.
- A novel pyrimidine hydrate phase was identified, transforming into a eutectic mixture upon heating.
Conclusions:
- The determined phase diagram is essential for understanding pyrimidine's thermodynamic behavior in humid environments.
- Novel amorphous and crystalline phases were discovered.
- The binary diagram facilitates the assessment of water content in hygroscopic pyrimidine samples.
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