不含亲水基团的偶氮苯衍生物L-B膜的制备和性质研究

本文合成了具有一定结构特点的偶氮苯的衍生物, 以元素分析和^1HNMR鉴定了B产物的组成和结构。采用L-B技术制备了其多层L-B膜, 以紫外可见光谱研究了膜中分子的聚集状态和膜的纵向均匀性; 以偏振紫外确定了膜中分子偶氮基的取向; L-B膜的小角度X射线衍射结果表明膜具有层状有序的周期性结构。

Studies on the preparation and properties of L-B films formed from azobenzene derivative without hydrophilic groups

The synthesis of 4-(N-hexadecylamino)azobenzene is described. This compound was characterized by elemental anal. and 1H NMR. Mixed monolayers with arachidic acid were prepared and deposited on hydrophobic optical glass or quartz slides. The UV-visible spectra of solns. and LB (Langmuir-Blodgett) films exhibit absorption max. at 396 and 388.5 nm, resp. The small blue shift indicates H-aggregate formation in the LB film. Absorbance increases as the no. of layers increases, but the peak position is unchanged, confirming the absence of mol. aggregates between adjacent layers and the good vertical uniformity of successive monolayers. The orientation of the azobenzene chromophores in the LB films was examined by using polarized light absorbance measurements. The diffraction patterns were determine and the Bragg peaks assigned (lattice spacing 5.49 nm). The LB films are built up into ordered multilayer films with periodic structure.