Abstract
Identification of chemical groups that enhance solubility of hydrocarbon-based surfactants and polymers in CO2 is of current interest in expanding applications of this 'green solvent'. In particular, the acetyl moiety is believed to solvate effectively in CO2 through a Lewis acid-base interaction between the carbonyl oxygen and CO2 carbon and this is further enhanced by specific weak H-bonding interaction of the α-hydrogens with the CO2 oxygen. In this communication we investigate the influence of this weak secondary interaction further by measurement of CO2 solubility of a range of β-d-glucopyranose pentaalkanoates containing as the acyl functionality acetyl, propionyl, butyryl, isobutyryl and trimethylacetyl (pivaloyl) groups. The results show that progressive replacement of the α-hydrogens of the acetyl by methyl results initially in a remarkable drop in solubility but surprisingly this is regained in the trimethylacetyl derivative that demonstrates a similarly high solubility to that of the acetyl compound.
Original language | English |
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Pages (from-to) | 21-24 |
Number of pages | 4 |
Journal | Journal of Supercritical Fluids |
Volume | 44 |
Issue number | 1 |
DOIs | |
Publication status | Published - Feb 2008 |
Keywords
- Carbon dioxide
- Molecular interactions
- NIR spectroscopy
- Solubility
- Supercritical fluids