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Transformable H-bonds and conformation in compressed glucose.
Ewa Patyk1, Andrzej Katrusiak1
1Department of Materials Chemistry , Faculty of Chemistry , Adam Mickiewicz University , Umultowska 89b , 61-614 Poznań , Poland . Email: katran@amu.edu.pl ; ; Tel: +48 618291590.
Chemical Science
|July 19, 2017
Summary
High pressure significantly alters crystalline alpha-d-glucose structure by changing hydrogen bonds and molecular interactions. This study reveals pressure-induced phase transitions in sugars and polysaccharides.
Area of Science:
- Carbohydrate chemistry
- Crystallography
- Materials science under pressure
Background:
- Alpha-d-glucose (α-d-glucose) exhibits complex structural transformations in response to external stimuli.
- Understanding molecular behavior under high pressure is crucial for materials science and chemistry.
Purpose of the Study:
- To investigate the effects of high pressure on the crystalline structure and intermolecular interactions of α-d-glucose.
- To identify pressure-induced phase transitions and their characteristics in α-d-glucose.
Main Methods:
- High-pressure X-ray diffraction studies were performed on crystalline α-d-glucose.
- Analysis of compressibility, hydrogen bonding (OH···O and CH···O), and structural voids under varying pressures.
Main Results:
- High pressure reverses the linear compressibility of α-d-glucose.
- An isostructural phase transition occurs at 5.40(2) GPa, involving rearrangement of OH···O hydrogen bonds.
- CH···O contacts gain importance, and structural voids are eliminated under pressure.
Conclusions:
- Pressure-induced structural transformations in α-d-glucose are significant and involve changes in hydrogen bond hierarchy.
- These findings suggest that monotonic and abrupt structural changes under pressure may be characteristic of sugars and polysaccharides.
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