Zhang Zhigang£¬Wu Hongcai£¬Meng Lingjie£¬Yi Wenhui
(School of Electronics and Information Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract: A novel poly(pyrrole methine),poly[(3-butyrylpyrrole-2£¬5-diyl)p-£¨N,N-dimethylamino)azobenzylidene]£¨PBPDMAABE£©,was synthesized firstly by condensation reaction of 3-butyrylpyrrole with 4-aldehyde-4'dimethylaminoazobenzene £¨ADMAA£©.The polymer can be easily dissolved in many kinds of organic solvent.The solubility and film-forming performance of the polymer are better than that of poly[(pyrrole-2£¬5-diyl)p-£¨N£¬Nª«-dimethylamino£©azobenzylidene]£®The chemical structure of PBPDMAABE is proved by infrared spectrum,proton magnetic resonance spectrum and ultravioletª²visible absorption spectrum.The optical forbidden band gap£¨Eg£©of PBPDMAABE is about 1.82 eV£®The third-order nonlinear optical properties of the polymer were studied using degenerate four-wave mixing £¨DFWM£©at 532 nm£®The measured third-order nonlinear susceptibilities of PBPDMAABE chloroform solution and film are as large as 2.12¡Á10-8esu and 3.91¡Á10-8esu£¬ respectively£®The second hyperpolarisability value of PBPDMAABE is 2.68¡Á10-25 esu and its nonlinear refractive index is 5.47¡Á10-7 esu£®The results indicate that the novel polymer is a promising nonlinear optical material£®
Keywords£ºpoly[(3-butyrylpyrrole-2£¬5-diyl£©p-£¨N£¬N-dimethylamino£©azobenzylidene£Ý; degenerate four-wave mixing technique;nonlinear optical property