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New insights into the transitional behaviour of methyl-6-O-(n-dodecanoyl)-α-D-glucopyranoside using variable temperature FTIR spectroscopy and X-ray diffraction
- Source :
- Liquid Crystals. 40:1817-1827
- Publication Year :
- 2013
- Publisher :
- Informa UK Limited, 2013.
-
Abstract
- The liquid crystalline behaviour of methyl-6-O-(n-dodecanoyl)-α-D-glucopyranoside, 1, has been characterised using X-ray diffraction and variable temperature Fourier transform infrared (FTIR spectroscopy). 1 exhibits a monotropic interdigitated smectic A phase consisting of bilayers in which the alkyl chains are overlapped. The crystal–isotropic transition is accompanied by a pronounced decrease in the strength of the hydrogen bonding network involving the sugar groups resulting in a marked change in the environment of the alkyl chains. The isotropic phase consists of disordered smectic-like domains stabilised via hydrogen bonding between the sugar groups. At the transition to the smectic A phase, a subtle change in hydrogen bonding is observed which is manifested by a change in the temperature dependence of the OH stretching peak position in the FTIR spectrum. On crystallisation, the strong hydrogen bonding network is re-established accompanied by a change in the conformational distribution of the alkyl ...
- Subjects :
- chemistry.chemical_classification
Phase transition
Materials science
Hydrogen bond
Infrared spectroscopy
General Chemistry
Condensed Matter Physics
Crystallography
chemistry
Liquid crystal
Phase (matter)
X-ray crystallography
Organic chemistry
General Materials Science
sense organs
Fourier transform infrared spectroscopy
Alkyl
Subjects
Details
- ISSN :
- 13665855 and 02678292
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Liquid Crystals
- Accession number :
- edsair.doi...........dbab100bb235a74714d9c8e820d7ddcd