Diaminostilbene derivatives

Abstract

The following 4,4′-bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonic acid derivative is well soluble in water: in which each of R 11 and R 12 is hydrogen, or a specifically substituted or unsubstituted alkyl group; each of R 21 and R 22 is hydrogen, a specifically substituted or unsubstituted alkyl group, a specifically substituted or unsubstituted aryl group; M is hydrogen, alkali metal, alkaline earth metal, ammonium, or pyridinium.

1 . 4,4′-Bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonic acid compound having the following formula:  
     
       
         
         
             
             
         
       
     
     in which 
 each of L 1  and L 2  is an alkylene group having 2 to 8 carbon atoms which has an intervening ether bonding;  
 each of R 11  and R 12  independently is hydrogen, methyl, ethyl, n-propyl, n-butyl, or 2-sulfoethyl;  
 each of R 21  and R 22  independently is hydrogen, methyl, ethyl, n-propyl, isopropyl, 2-hydroxyethyl, 2-hydroxypropyl, 3-hydroxypropyl, 2,3-dihydroxypropyl, 2-sulfoethyl, 2-(2-hydroxyethoxy)ethyl, 2-[2-(2-hydroxyethoxy)ethoxy]ethyl, phenyl, naphthyl, 4-hydroxyphenyl, 3,5-dicarboxyphenyl, 4-methoxyphenyl, and 3-isopropylphenyl; and  
 M is an alkali metal atom.  
 
   
   
       2 . 4,4′-Bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonic acid compound of  claim 1 , wherein at least one of L 1  and L 2  is a divalent group which is represented by the following formula:  
       —(CH 2 CH 2 O) n CH 2 — 
     in which n is an integer of 1 to 3.  
   
   
       3 . 4,4′-Bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonic acid compound of  claim 2 , wherein n in the formula is 1 or 2.  
   
   
       4 . 4,4′-Bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonic acid compound of  claim 1 , wherein each of R 11  and R 12  in the formula independently is a hydrogen or methyl.  
   
   
       5 . 4,4′-Bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonic acid compound of  claim 1 , wherein each of R 21  and R 22  in the formula independently is hydrogen, methyl, ethyl, isopropyl, 2-hydroxyethyl, 2-hydroxypropyl, 3-hydroxypropyl, 2,3-dihydroxypropyl, 2-(2-hydroxyethoxy)ethyl, 2-[2-(2-hydroxyethoxy)ethoxy]ethyl, phenyl, or 4-hydroxyphenyl.  
   
   
       6 . An aqueous solution in which a 4,4′-Bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonic acid compound of  claim 1  is dissolved in water.  
   
   
       7 . A method of brightening a surface of material with fluorescence which comprises applying onto the surface an aqueous solution in which a 4,4′-Bis(1,3,5-triazinylamino)stilbene-2,2′-disulfonic acid compound of  claim 1  is dissolved in water.