| 摘要 |
<p>Electricallly photosensitive materials for photoelectrophoretic (PEP) imaging processes. There is a continuing effort to find materials which possess useful levels of electrical photosensitivity and exhibit good colorant properties including neutral or near neutral coloration. Symmetric or asymmetric merocyanine-cyanine-merocyanine compounds of the general formula provide these materials:$(8,)$wherein all moieties below are the same or different: m and n are 0,1 or 2; t and u are 0 or 1; p is 0, 1 or 2; R?1 and R11¿ are alkyl, aryl, aralkyl, alkaryl, carbocyclic or heterocyclic or, when taken together and p is 0, are a one-or two-carbon alkylene bridge; R?2 and R22¿ are alkyl, aryl, aralkyl, alkaryl, carbocyclic or heterocyclic; R?3 and R33¿ are hydrogen or alkyl; R?4 and R44¿ are hydrogen or alkyl; R4, taken together with R2 and t is 0, and R44, taken together with R22 and u is 0, form an alkylene or heteroalkylene bridge; R?3 and R4 and R33 and R44¿, taken together, form an alkylene or heteroalkylene bridge; R?5, R6 and R7¿ are hydrogen or alkyl or, taken individually together with R?1 or R11¿, form an alkylene or heteroalkylene bridge; Y and Y1 complete a basic heterocyclic cyanine dye nucleus; A and A1 are oxygen, sulfur, selenium or -NR8 wherein R8 is alkyl, aryl, aralkyl, alkaryl, carbocyclic or heterocyclic.</p> |
