TY - JOUR
T1 - Ionic liquids in polyethylene glycol aqueous solutions
T2 - Salting-in and salting-out effects
AU - Visak, Zoran P.
AU - Canongia Lopes, José N.
AU - Rebelo, Luis Paulo N.
PY - 2007/11/1
Y1 - 2007/11/1
N2 - 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.
AB - 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.
KW - Aqueous PEG solutions
KW - Ionic Liquids
KW - Kosmotropic and chaotropic salts
KW - Salting-out effects
UR - http://www.scopus.com/inward/record.url?scp=35648997963&partnerID=8YFLogxK
UR - https://link.springer.com/article/10.1007%2Fs00706-007-0721-3
U2 - 10.1007/s00706-007-0721-3
DO - 10.1007/s00706-007-0721-3
M3 - Article
AN - SCOPUS:35648997963
SN - 0026-9247
VL - 138
SP - 1153
EP - 1157
JO - Monatshefte fur Chemie
JF - Monatshefte fur Chemie
IS - 11
ER -