Preparation, cation-anion interactions and physicochemical properties of ether-functionalized imidazolium ionic liquids

Journal of the Brazilian Chemical Society

Henri S. Schrekker¹  Dagoberto O. Silva¹  Marcos A. Gelesky¹  Marcelo P. Stracke¹  Clarissa M. L. Schrekker¹  Reinaldo S. Gonçalves¹  Jairton Dupont¹ 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Química Porto Alegre RS ,Brazil

关键词: imidazolium ionic liquids;    ether-functionalized;    hydrogen bonding;    physicochemical properties;    task-specific;   

DOI  :  10.1590/S0103-50532008000300009

来源: SciELO

【 摘 要 】

A set of 1-alkyl ether (and 1-alkyl)-3-methylimidazolium ionic liquids 2-4 ([CxOyMIm]+[Anion]- or [CxMIm]+[Anion]-, where MIm = 3-methylimidazolium; CxOy = 1-alkyl ether, C7O3 = -(CH2)2O(CH2)2O(CH2)2OCH3 (A), C3O1 = -(CH2)2OCH3 (B); Cx = 1-alkyl, C10 = C10H21 (C), C4 = 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 H² 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 functionalized 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.

【 授权许可】

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