STUDIES OF SOLUTE SOLVENT INTERACTIONS IN MIXTURES OF SUPERCRITICAL FLUIDS USING FLUORESCENCE SPECTROSCOPY

被引:79
作者
SUN, YP
BENNETT, G
JOHNSTON, KP
FOX, MA
机构
[1] UNIV TEXAS, DEPT CHEM ENGN, AUSTIN, TX 78712 USA
[2] UNIV TEXAS, DEPT CHEM & BIOCHEM, AUSTIN, TX 78712 USA
关键词
D O I
10.1021/j100203a077
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Solute-solvent interactions of (dimethylamino)benzonitrile and ethyl (dimethylamino)benzoate in mixtures of supercritical trifluoromethane and carbon dioxide are studied using fluorescence spectroscopy. The density dependence of solvation in the mixtures is similar to that in the pure supercritical fluids. The polar component CHF3 in the mixtures clusters preferentially about a solute molecule. This clustering is also density dependent. Bulk and local (microscopic) solvent effects in the in different density regions are rationalized based on the Onsager reaction field model and on the concepts of local density and composition.
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收藏
页码:10001 / 10007
页数:7
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