Synthesis and properties of nonlinear optical chromophores and polymers containing 6-nitroquinoline as pi-electron acceptor

Two nonlinear optical (NLO) methacrylate monomers, 2-methyl-acrylic acid 2- (ethyl-{4-[2-(6-nitro-quinolin-2-yl)-vinyl]-phenyl} -amino)-ethyl ester (5) and 2-methyl-acrylic acid 6-{3-[2-(6-nitro-quinolin-2-yl)-vinyl]-carbazol- 9-yl}-hexyl ester (7) were newly synthesized and copolymerized with methylm ethacrylate to give NLO polymers, P1 and P2. These polymers were well solub le in organic solvents and showed glass transition temperatures at 145 degr ees C and 114 degrees C, respectively. The number average molecular weights (Mn) were 26,600 for P1 and 9,300 for P2. The SHG coefficients (d(33)) of corona-poled films of P1 and P2 measured with 1.064 mu m Nd-YAG laser were 32.2 pm/V and 17.6 pm/V, respectively.