Acid-base mixture and ion conductor comprising the same

Abstract

Disclosed is an acid-base mixture composed of a base component and an acid component, wherein at least one of the base component and the acid component contains at least two compounds, and the base component contains at least one compound of formula (1): wherein R 1 , R 2 , and R 3 each represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, provided that at least one of them is a hydrocarbon group. Also disclosed is an ion conductor comprising an acid-base mixture composed of an acid component and a base component including at least one compound of formula (2): wherein R 1 , R 2 , and R 3 each represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, provided that R 1 and R 3 are different.

1 . An acid-base mixture comprising a base component and an acid component, at least one of the base component and the acid component comprising at least two compounds, and the base component comprising at least one compound represented by chemical formula (1):  
     
       
         
         
             
             
         
       
     
     wherein R 1 , R 2 , and R 3  each represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, provided that at least one of them is a hydrocarbon group.  
   
   
       2 . The acid-base mixture according to  claim 1 , wherein the base component comprises at least one compound represented by chemical formula (2):  
     
       
         
         
             
             
         
       
     
     wherein R 1 , R 2 , and R 3  each represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, provided that R 1  and R 3  are different.  
   
   
       3 . The acid-base mixture according to  claim 1 , having a melting point of 120° C. or lower or substantially no melting point.  
   
   
       4 . The acid-base mixture according to  claim 1 , being an equimolar mixture of the base component and the acid component.  
   
   
       5 . The acid-base mixture according to  claim 1 , being liquid at room temperature.  
   
   
       6 . The acid-base mixture according to  claim 1 , wherein at least one of the base components comprises 2-ethyl-4-methylimidazole.  
   
   
       7 . The acid-base mixture according to  claim 1 , wherein at least one of the base components comprises 4-methylimidazole.  
   
   
       8 . The acid-base mixture according to  claim 1 , wherein at least one of the base components comprises 2-ethylimidazole.  
   
   
       9 . The acid-base mixture according to  claim 1 , wherein at least one of the acid components comprises an acid structurally free from a fluorine atom.  
   
   
       10 . The acid-base mixture according to  claim 1 , wherein at least one of the acid components comprises an inorganic acid.  
   
   
       11 . The acid-base mixture according to  claim 10 , wherein at least one of the acid components comprises sulfuric acid or phosphoric acid.  
   
   
       12 . The acid-base mixture according to  claim 1 , being ion conductive.  
   
   
       13 . The acid-base mixture according to  claim 1 , being proton conductive.  
   
   
       14 . An ion conductor comprising an acid-base mixture comprising a base component and an acid component, the base component comprising a base represented by chemical formula (2):  
     
       
         
         
             
             
         
       
     
     wherein R 1 , R 2 , and R 3  each represent a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, provided that R 1  and R 3  are different.  
   
   
       15 . The ion conductor according to  claim 14 , wherein R 1  in chemical formula (2) is a hydrocarbon group having 1 to 20 carbon atoms.  
   
   
       16 . The ion conductor according to  claim 15 , wherein R 1  in chemical formula (2) is a methyl group.  
   
   
       17 . The ion conductor according to  claim 15 , wherein R 2  in chemical formula (2) is a hydrocarbon group having 1 to 20 carbon atoms.  
   
   
       18 . The ion conductor according to  claim 17 , wherein R 2  in chemical formula (2) is an ethyl group.  
   
   
       19 . The ion conductor according to  claim 14 , wherein R 3  in chemical formula (2) is a hydrogen atom.  
   
   
       20 . The ion conductor according to  claim 14 , wherein the base component is 4-methylimidazole.  
   
   
       21 . The ion conductor according to  claim 14 , wherein the base component is 2-ethyl-4-methylimidazole.  
   
   
       22 . The ion conductor according to  claim 14 , wherein the acid component is an acid structurally free from a fluorine atom.  
   
   
       23 . The ion conductor according to  claim 14 , wherein the acid component is an inorganic acid.  
   
   
       24 . The ion conductor according to  claim 23 , wherein the inorganic acid is sulfuric acid.  
   
   
       25 . The ion conductor according to  claim 14 , being a proton conductor.