聚吡咯衍生物的合成及其三阶非线性光学性能

Synthesis and Third-order Nonlinear Optical Properties of Novel Poly Pyrrole Derivatives

以吡咯为原料,通过逐步分子设计合成了聚3 丁酰基吡咯(PBPY)和聚[(3 丁酰基吡咯 2,5 二)对二甲氨基苯甲烯](PBPDMABE)。通过氢核磁(1 H NMR)、傅里叶 红外(FT IR)、和紫外 可见(UV Vis)光谱对反应中间体和目标产物的结构进行了详细表征。对 PBPY和 PBPDMABE粉末进行了 I掺杂处理,采用四探针法对本征态和掺杂后的聚合物电导率进行了测量,测试结果表明,经过 I掺杂处理后PBPY和PBPDMABE具有较高的电导率,分别为1.3×10-1 S/cm和3.8×10-6 S/cm。根据光学禁带宽度与入射光子能量的关系,计算了PBPY和PBPDMABE薄膜的光学禁带宽度,分别为 2.06 eV和1.79 eV。利用后向简并四波混频(DFWM)技术测量了 2 种聚合物薄膜的三阶非线性极化率。结果表明,在波长为532 nm的激光作用下,PBPY和PBPDMABE的三阶非线性极化率分别为8.75×10-10 esu和4.65×10-8 esu。

Two novel π-conjugated polymers, poly(3-butyrylpyrrole) (PBPY) and poly[(3-butyrylpyrrole-2,5-diyl) p-N,N-dimethylaminobenzylidene] (PBPDMABE), were synthesized. PBPY, PBPDMABE and their intermediates were characterized by 1H-NMR, FTIR and UV-Vis spectroscopy.The conductivities of PBPY and PBPDMABE doped with I are as high as 1.3 × 10-1 S/cm and 3.8 × 10-6 S/cm, respectively. According to the function of the optical forbidden band gap (Eg) and the photon energy (hv), the optical forbidden band gaps of PBPY and PBPDMABE were calculated. The Eg values of PBPY and PBPDMABE are 2.06 eV and 1.79 eV, respectively. The third-order nonlinear optical properties of the polymers were studied by backward degenerate four-wave mixing (DFWM) technique at 532 nm. The third-order nonlinear susceptibilities of PBPY and PBPDMABE are about 8.75 × 10-10 esu and 4.65 × 10-8 esu, respectively.