Croatica Chemica Acta, Vol. 93 No. 1, 2020.
Izvorni znanstveni članak
https://doi.org/10.5562/cca3606
Structural Characterization of β-Glycolaldehyde Dimer
Vlasta Mohaček-Grošev
orcid.org/0000-0002-8009-4822
; 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
Sažetak
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
Hrčak ID:
237323
URI
Datum izdavanja:
24.4.2020.
Posjeta: 2.201 *