High Stability Diionic Liquid Salts

Abstract

The present invention relates to diionic liquid salts of dicationic or dianionic molecules, as well as solvents comprising diionic liquids and the use of diionic liquids as the stationary phase in a gas chromatographic column.

1 - 40 . (canceled) 
     
     
         41 . A diionic liquid salt comprising at least one dication of the formula
   A-B-A′
   
       and at least one counter anion, wherein
 A and A′ are the same mono-cationic group selected from the group consisting of —[N(R) 2 H] + , —[As(R) 3 ] + , and tetrahydrothiophenium, wherein each R is independently selected from the group consisting of alkyl, alkenyl, alkynyl, cycloalkyl, phenyl, and benzyl; and 
 B is an optionally substituted C 2 -C 40  hydrocarbon backbone, wherein the hydrocarbon backbone optionally contains, in addition to carbon and hydrogen atoms, at least one heteroatom selected from the group consisting of nitrogen, oxygen, sulfur, and silicon. 
 
     
     
         42 . The diionic liquid salt of  claim 41 , wherein the diionic liquid salt has a solid/liquid transition temperature of about 100° C. or less. 
     
     
         43 . The diionic liquid salt of  claim 41 , wherein the diionic liquid salt has a solid/liquid transition temperature of about 25° C. or less. 
     
     
         44 . The diionic liquid salt of  claim 41 , wherein B has a length about equivalent to a C 3 -C 30  carbon chain. 
     
     
         45 . The diionic liquid salt of  claim 41 , wherein B is unsymmetric and contains a side chain group. 
     
     
         46 . The diionic liquid salt of  claim 41 , wherein B contains at least one unsaturated group which can facilitate cross-linking or immobilization. 
     
     
         47 . The diionic liquid salt of  claim 41 , wherein the at least one counter anion is a mono-ionic counter anion. 
     
     
         48 . The diionic liquid salt of  claim 47 , wherein the mono-ionic counter anion is independently selected from the group consisting of Br − , mono-sulfonate, mono-sulfate, NTf 2   − , BF 4   − , triflate and PF 6   − . 
     
     
         49 . The diionic liquid salt of  claim 41 , wherein the at least one counter anion is a diionic counter anion. 
     
     
         50 . The diionic liquid salt of  claim 49 , wherein the diionic counter anion is selected from the group consisting of dicarboxylate, disulfate and disulfonate 
     
     
         51 . The diionic liquid salt of  claim 41 , wherein the dicationic species is selected from the group consisting of: 
       
         
           
           
               
               
           
         
       
       wherein n is 2 to 40, inclusive.