Synthesis of a styrylthiophene monomer and corresponding polyurethane and their optical nonlinearity

A novel trans-7-[4-N, N-di-(beta-hydroxyethylamino-benzene)]-ethenyl-3,5-di nitrothiophene (HBDT) monomer and corresponding prepolymer, polyurethane wi th the monomer covalently incorporated were synthesized and characterized. The reaction temperature affecting monomer's formation were discussed. Sinc e thiophene has a lower delocalization energy than that of benzene, it can offer more effective conjugation and higher nonlinearity than that of benze ne in donor-acceptor organic compounds, and forms objective molecules with reasonable optical, thermal stability. The monomer and polyurethane exhibit ed a good solubility in common organic solvents and thermal stability, The high optical quality films of the polyurethane were fabricated and corona-p oled, The UV-Vis absorption peaks (530 nm) of the monomer in methanol and t he without poling polyurethane films didn't change basically. The second, t hird-order nonlinear optical susceptibility beta(mu), chi((3)), gamma of HB DT was measured by solvatochromic method and DFWM method, respectively, the y were 8.443 x 10(-45) esu, 1.016 x 10(-12) esu (c = 3.96 x 10(-3) mol/L), 3.93 x 10(-32) esu, respectively.