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Structural Characterization of β-Glycolaldehyde Dimer

Mohaček Grošev, Vlasta; Prugovečki, Biserka; Prugovečki, Stjepan (2020) Structural Characterization of β-Glycolaldehyde Dimer. Croatica Chemica Acta, 93 (1). P1-P8. ISSN 0011-1643

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Structural characterization of the β-polymorph of glycolaldehyde dimer by powder X-ray diffraction, Raman and infrared spectroscopies is described. The previously described α-polymorph and the β-polymorph both crystallize in the monoclinic crystal system, space group P21/c, but with different cell parameters. There are no significant differences in the glycolaldehyde dimer molecular structure, the molecules in both polymorphs are trans-isomers with the hydroxyl groups in axial positions. The two polymorphs have a different arrangement of the glycolaldehyde dimer molecules. In the previously reported α-polymorph the molecules are arranged in hydrogen bonded layers parallel to (100) while in the β-polymorph the hydrogen bonded molecules are arranged in a three-dimensional network. Theoretically calculated Gibbs free energy as well as differential scanning calorimetry indicate β-polymorph to be the stable crystal phase of glycolaldehyde.

Item Type: Article
Uncontrolled Keywords: glycolaldehyde dimer; crystal structure; Raman; infrared; X-ray powder diffraction; biodegradable polymer
Subjects: NATURAL SCIENCES > Physics > Atomic and Molecular Physics
NATURAL SCIENCES > Physics > Condensed Matter Physics
NATURAL SCIENCES > Chemistry > Physical Chemistry
Divisions: Division of Materials Physics
Depositing User: Vlasta Mohaček Grošev
Date Deposited: 22 Oct 2020 06:22
DOI: 10.5562/cca3606

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