| abstract |
Disclosed are styryl dyes of formula n n n n n n n n n n whereinn R 1 , R 2 , R 3 , R′ 1 , R ′ 2 and R′ 3 independently of each other are hydrogen; —NH(CO)—C 1 -C 5 alkyl; —N(C 1 -C 5 alkyl)(C 1 -C 5 alkyl-CN); C 1 -C 6 alkoxy; a heterocyclic radical; or R 1 and R 2 or R′ 1 and R ′ 2 together form a 5- to 10-membered, monocyclic, carbocyclic or heterocyclic ring; wherein at least one of R 1 , R 2 , R 3 , R′ 1 , R′ 2 and R′ 3 is different from hydrogen; Q and Q′ independently from each other are the direct bond; *—C(O)—*; *—C(O)O—*; *—OCO—*; *—N(R 4 )—*; nn n n n n n n n n n *—C(O)N(R 6 )—*; or *—(R 6 )NC(O)—*; andn R 4 , R 5 and R 6 independently from each other are hydrogen; C 1 -C 14 alkyl; C 2 -C 14 alkenyl; C 6 -C 12 aryl; C 6 -C 12 aryl-C 1 -C 10 alkyl; or C 1 -C 10 alkyl(C 5 -C 12 aryl); X and X′ are *—(CH 2 ) m —*; Y 1 and Y 2 independently from each other are C 1 -C 10 alkylene; C 6 -C 10 cycloalkylene; C 5 -C 12 arylene; or C 6 -C 12 arylene-(C 1 -C 10 alkylene); An − is an anion; m is a number from 1 to 8; n is 0, or 1; and p is 0, or 1. |