期刊
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
卷 19, 期 3, 页码 426-433出版社
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532008000300009
关键词
imidazolium ionic liquids; ether-functionalized; hydrogen bonding; physicochemical properties; task-specific
A set of 1-alkyl ether (and 1-alkyl)-3-methylimidazolium ionic liquids 2-4 ([C(x)O(y)MIm](+)[Anion](-) or [C(x)MIm](+)[Anion](-), where MIm = 3-methylimidazolium; CxOy = 1-alkyl ether, C7O3 = -(CH2)(2)O(CH2)(2)O(CH2)(2)OCH3 (A), C3O1 = -(CH2)(2)OCH3 (B) C-x = 1-alkyl, C-10 = C10H21 (C), C-4 = C4H9 (D); and [Anion](-) = H3CSO3- (2), BF4- (3) or PF6- (4)) was prepared and characterized. The cation-anion hydrogen bonding strength showed to be mainly anion dependent and decreased in the order H3CSO3- > BF4- > PF6-. All methanesulfonate ionic liquids 2 possessed a strongly deshielded H-2 imidazolium ring proton. 1-Alkyl ether functionalized ionic liquids showed higher densities in comparison to their 1-alkyl equivalents. The salts 2a-b, 3a-d and 4a-b are room-temperature ionic liquids. All 1-alkyl ether functionahzed ionic liquids (except 4b) are completely amorphous. The widest liquid ranges were obtained with the tetrafluoroborate ionic liquids due to their late solidification and excellent thermal stability. These data provide important information for the understanding of their application scope and the preparation of task-specific ionic liquids.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据