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利用与花生酸交替的方法，制备了２－硝基－５－（Ｎ－甲基－Ｎ－＋八烷基）氨基苯甲酸（ＮＭＯＢ）非中心对称多层膜，研究了它的非线性光学性质。结果表明，该多层膜的二次谐波强度与ＮＭＯＢ层数平方基本成正比。Ｘ－射线小角衍射测定结果再次表明，多层膜的排列相当有序，ＮＭＯＢ单层膜厚度为２．７６ｎｍ。ＮＭＯＢ有良好的二阶非线性光学性质和出色的成膜性能，是一种很好的非线性光学ＬＢ膜材料，可望用于制作光波导。
A non-centrosymmetric multilayer film of 2-nitro-5- (N-methyl-N-octaalkyl) aminobenzoic acid (NMOB) was prepared by alternating with arachidic acid. nature. The results show that the second harmonic intensity of the multilayer film is proportional to the square of the NMOB layer. X-ray small angle diffraction measurements again show that the arrangement of the multilayer films is quite orderly and the thickness of the NMOB monolayer is 2.76 nm. NMOB has good second-order nonlinear optical properties and excellent film-forming properties, and is a good nonlinear optical LB film material, which is expected to be used for making optical waveguides.