Synthesis and nonlinear optics of soluble poly(phenyleneethynylene)

Soluble poly(phenyleneethynylene)s [C≡C-Ph-C≡C-Ph(OR)] n (R= (CH 2 ) m CH 3 , m= 15, 17, 21) is synthesized by Pd-catalyzed coupling of diethynylbenzene. The polymer with m= 21 was found to have a χ 3 (ω) value of 1.8x10 -9 esu