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Low‐Melting, Low‐Viscous, Hydrophobic Ionic Liquids: 1‐Alkyl(Alkyl Ether)‐3‐methylimidazolium Perfluoroalkyltrifluoroborate
Author(s) -
Zhou ZhiBin,
Matsumoto Hajime,
Tatsumi Kuniaki
Publication year - 2004
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.200400533
Subject(s) - alkyl , melting point , ether , ionic liquid , glass transition , chemistry , thermal stability , viscosity , ionic conductivity , crystallography , medicinal chemistry , materials science , organic chemistry , polymer , catalysis , electrode , electrolyte , composite material
A series of twenty two hydrophobic ionic liquids, 1‐alkyl(alkyl ether)‐3‐methylimidazolium ([C m mim] + or [C m O n mim] + ; where C m is 1‐alkyl, C m = n C m H 2 m +1 , m =1–4 and 6; C m O n is 1‐alkyl ether, C 2 O 1 =CH 3 OCH 2 , C 3 O 1 =CH 3 OCH 2 CH 2 , and C 5 O 2 =CH 3 (OCH 2 CH 2 ) 2 ) perfluoroalkyltrifluoroborate ([R F BF 3 ] − , R F =CF 3 , C 2 F 5 , n C 3 F 7 , n C 4 F 9 ), have been prepared and characterized. Some of the important physicochemical properties of these salts including melting point, glass transition, viscosity, density, ionic conductivity, thermal and electrochemical stability, have been determined and were compared with those of the reported [BF 4 ] − ‐based ones. The influence of the structure variation in the imidazolium cation and the perfluoroalkyltrifluoroborate ([R F BF 3 ] − ) anion on the above physicochemical properties was discussed. The key features of these new salts are their low melting points (−42 to 35 °C) or extremely low glass transition (between −87 and −117 °C) without melting, and considerably low viscosities (26–77 cP at 25 °C).