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Zwitterion/Brønsted Acid Mixtures Showing Controlled Lower Critical Solution Temperature‐Type Phase Changes with Water
Authors:Yuki Mieno  Dr Yuki Kohno  Dr Shohei Saita  Prof?Dr Hiroyuki Ohno
Institution:1. Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo, Japan;2. Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo, Japan
Abstract:A new ammonium‐type zwitterion (ZI), N,N‐dihexyl‐N‐monopentyl‐3‐sulfonyl‐1‐propaneammonium (N665C3S) with adequate hydrophobicity showed reversible and highly temperature‐sensitive lower critical solution temperature (LCST)‐type phase transitions after being mixed with pure water. Generally for such compounds, those with longer alkyl chains were immiscible with water and those with shorter chains were miscible with water, regardless of temperature. A slightly more hydrophobic ZI than N665C3S showed LCST‐type phase behavior with water when it was mixed with equimolar amounts of a Brønsted acid such as trifluoromethanesulfonic acid (HTfO). The phase‐transition temperature of the ZI/Brønsted acid mixed aqueous solution was controllable by water content.
Keywords:Brø  nsted acids  ionic liquids  lower critical solution temperature  phase transitions  zwitterions
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