Ionic liquids in polyethylene glycol aqueous solutions: Salting-in and salting-out effects

被引：54
|
作者：
Visak, Zoran P.
Lopes, Jose N. Canongia
Rebelo, Luis Paulo N.
机构：
[1] Univ Nova Lisboa, Inst Tecnol Quim & Biol, Oeiras, Portugal
[2] Inst Super Tecn, Ctr Quim Estrutural, Lisbon, Portugal
来源：
MONATSHEFTE FUR CHEMIE | 2007年 / 138卷 / 11期
关键词：
ionic liquids; salting-out effects; aqueous PEG solutions; kosmotropic and chaotropic salts;
D O I：
10.1007/s00706-007-0721-3
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Changes of the fluid phase behaviour of polyethylene glycol (PEG) aqueous solutions - viz. critical solution temperature shifts at atmospheric pressure - were produced by the addition of different ionic liquids, namely 1-ethyl-3-methylimidazolium ethyl sulfate and 1-alkyl-3-methylimidazolium chloride (alkyl = ethyl to decyl). The addition of ionic liquids with long alkyl chains improves the solubility of PEG in water (salting-in effect), whereas the impact of short-chain ionic liquids is usually the contrary (salting-out effect). The results are interpreted taking into account the kosmotropic (water- structuring) or chaotropic (water-structure-breaking) nature of ionic liquids, as compared to other inorganic salts.
引用
收藏
页码：1153 / 1157
页数：5
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