一种具有偶氮侧链的吡咯甲烯的合成与研究

以4 甲酰基 4′ 二甲胺基偶氮苯(FDMAA)与吡咯为原料,在浓盐酸催化下缩聚得到了聚吡咯对二甲胺基偶氮苯甲烷(PPDMAB),再与四氯苯醌进行脱氢反应得到聚吡咯对二甲胺基偶氮苯甲烯(PPDMABQ)。红外光谱、紫外-可见吸收光谱表明PPDMAB中含有部分醌化的成分,而PPDMABQ的红外谱图在1650cm-1附近的吸收强度增加,紫外-可见吸收光谱530nm附近强度的增加都说明了醌化反应的发生和共轭结构的形成。X衍射表明PPDMABQ主要呈非晶态,但存在微小晶区。热重分析显示PPDMABQ在260℃以上开始分解。采用了两种模型对PPDMABQ薄膜的光学禁带宽度进行了计算,分别为1 42eV和1 76eV。

Synthesis and Study of a Kind of Poly(pyrrolyl methines) with Azo Side Groups

Poly(pyrrole-2,5-diyl)-p-(N,N-dimethylamino)azobenzylidene](PPDMAB) is prepared from 4-formyl-4′-dimethylaminoazobenzene(FDMAA) and pyrrole by condensation polymerization.Then PPDMAB is oxidized to poly(pyrrole-2,5-diyl)-p-(N,N-dimethylamino) azobenzylidenequinomethane-2,5-diyl] (PPDMABQ).The IR and UV-Vis absorption spectra of PPDMAB indicate that there is part quinoid structure in it.The enlarged absorption peak at 1650 cm~(-1) in IR spectrum and the bigger absorption peaks at 530 nm in UV-Vis spectra imply that the quinoid structure is virtually formed in PPDMABQ.The spectrum of X-ray diffraction of PPDMABQ shows that there are some small crystallized regions.The thermal stability by TGA is studied which indicates that PPDMABQ decomposes above 260 ℃.Using two models,the bandgaps of PPDMABQ are calculated as 1.42 eV and 1.76 eV,respectively.