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Zwitterion/Brønsted Acid Mixtures Showing Controlled Lower Critical Solution Temperature‐Type Phase Changes with Water
Author(s) -
Mieno Yuki,
Kohno Yuki,
Saita Shohei,
Ohno Hiroyuki
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201600973
Subject(s) - lower critical solution temperature , zwitterion , aqueous solution , chemistry , sulfonyl , phase transition , alkyl , phase (matter) , ammonium , polymer chemistry , organic chemistry , thermodynamics , copolymer , polymer , molecule , physics
A new ammonium‐type zwitterion (ZI) , N,N‐ dihexyl‐ N ‐monopentyl‐3‐sulfonyl‐1‐propaneammonium (N 665 C3S) 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 N 665 C3S 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.