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Structural Characterization of β-Glycolaldehyde Dimer

Vlasta Mohaček-Grošev orcid id ; Center of Excellence for Advanced Materials and Sensing Devices, Ruđer Bošković Institute, Bijenička c. 54, 10000 Zagreb, Croatia
Biserka Prugovečki ; Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
Stjepan Prugovečki ; Malvern Panalytical B.V., Lelyweg 1, 7602 EA Almelo, The Netherlands

Puni tekst: engleski pdf 6.553 Kb

str. 15-22

preuzimanja: 693



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.

This work is licensed under a Creative Commons Attribution 4.0 International License.

Ključne riječi

glycolaldehyde dimer; crystal structure; Raman; infrared; X-ray powder diffraction; biodegradable polymer

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