New insights into the transitional behaviour of methyl-6-O-(n-dodecanoyl)-α-D-glucopyranoside using variable temperature FTIR spectroscopy and X-ray diffraction
| Autor: | Alfonso Martinez-Felipe, Jm M. Seddon, Nicholas J. Brooks, Andrew G. Cook, Corrie T. Imrie |
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| Rok vydání: | 2013 |
| Předmět: |
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 |
| Zdroj: | Liquid Crystals. 40:1817-1827 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678292.2013.854556 |
| Popis: | 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 ... |
| Databáze: | OpenAIRE |
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