Novel color-forming compounds and use thereof in imaging members and methods

Abstract

There are described novel rhodamine color-forming compounds. The rhodamine color-forming compounds exhibit a first color when in a crystalline form and a second color, different from the first color, when in an amorphous form. Thermal imaging members containing these color-formers are also described.

1 . A compound represented by the formula (I): 
       
         
           
           
               
               
           
         
         wherein: 
         R 1 -R 10  are alkyl or hydrogen; 
         at least one of R 11 , R 15 , R 16  and R 20  is alkyl or halogen; 
         at least one of R 11 , R 13 , R 15 , R 16 , R 18  and R 20  is fluorine; 
         and R 11 -R 20  are chosen from the group consisting of hydrogen, alkyl, substituted alkyl, halogen, alkoxy, and substituted carbonyl. 
       
     
     
         2 - 13 . (canceled)