NDLI: Changing from an unusual high-temperature demixing to a UCST-type in mixtures of 1-alkyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide and arenes

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Changing from an unusual high-temperature demixing to a UCST-type in mixtures of 1-alkyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide and arenes

Content Provider	Royal Society of Chemistry (RSC)
Author	Łachwa, Joanna Esperança, José M. S. S. Guedes, Henrique J.R. Seddon, Kenneth R. Rebelo, Luís Paulo N. Makowska, Anna Szydłowski, Jerzy
Copyright Year	2006
Abstract	Upper critical solution temperature (UCST) combined with a high-temperature demixing type of phase diagrams are reported for binary liquid mixtures containing the ionic liquids, 1-alkyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide ([Cnmim][NTf2], where n = 2, 4, 6, 8, 10) and benzene, toluene, or α-methylstyrene (PhC(Me)CH2), at atmospheric and moderately high pressure. The phase diagrams were determined either using a dynamic method with visual detection of phase transitions or a laser light scattering technique. In our investigations, as the imidazolium alkyl chain length of the ionic liquid increases, the mixtures containing an arene evolve from a rarely found high-temperature demixing behaviour, to “hour-glass”, to the common phase splitting as temperature diminishes (UCST, whenever a critical point was found). For the three systems containing specifically [C10mim][NTf2] with benzene, toluene, or α-methylstyrene, data were also collected up to 5 MPa using a high-pressure laser light scattering apparatus. For all phase diagrams, the critical compositions correspond to low concentrations of the ionic liquid. This fact underlies the possibility that ionic liquids, even in relatively dilute solutions, tend to form multiple-ion aggregates. This was corroborated by electro-spray mass spectrometry.
Starting Page	262
Ending Page	267
Page Count	6
File Format	HTM / HTML PDF
ISSN	14639262
Volume Number	8
Issue Number	3
Journal	Green Chemistry
DOI	10.1039/b513308d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Upper critical solution temperature Alkyl Sulfonyl Amide Benzene Toluene Alpha-Methylstyrene Laser Scattering Ionic liquid Calculus of variations Mass spectrometry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution

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