偶氮连接基团(—NN—)有着特殊的热化学和光化学行为，在适当波长光的照射下，能发生可逆的顺反异构反应，从而发生吸收波长的变化。在分子设计、光定位、光致变色和热致变色等方面，偶氮连接基团的非线性光化学性质都有着潜在的应用价值。文章以含有偶氮基作为侧翼的弯曲型分子作为研究对象，比较了弯曲型和直线型分子的吸收光谱；并用计算机模拟计算了弯曲型分子的角度，发现分子弯曲角和紫外可见吸收光谱存在着密切的关系。

The azo (—NN—) linkage has the particular thermochemistry and actinoche-mistry behavior，the azobenzene group can undergo reversible cis-trans isomerization under light irradiation and its nonlinear optical properties possess the potential applications in the aspects of molecular design, photofixation, photochromics, thermochromism, etc. The UV-Vis absorbance of sixteen bent-core or linear monomers containing azobenzene as side arms and substituted para/m-aminobenzoic acid as central units was studied. The angle of the bent-core molecules was simulated. The trans-form of azo compounds showed a strong band in the UV region (330~370 nm) and a weak band at 440~450 nm. It was found that it has a close relationship between the angle of the molecules and the UV-Vis absorption.