【摘要】 通过重氮化、偶合、还原和烷基化反应合成了３个溴代苯并三唑类紫外线吸收剂，经红外光谱、核磁共振、质谱和元素分析等确证了结构，并测定了其吸收波长，实验发现引入溴原子使其紫外线吸收性能提高。更多还原

【Abstract】 Three type Ⅱ UV absorbers of brominated benzotriazols were prepared by diazotisation,coupling,reduction and alkylation. The structures of these new compounds were characterized by IR, NMR, MS and Elementary Analysis. The UV visible absorption of UV absorbers was also tested. The increase of their molar absorption coefficient and the red shift of their maximum wavelength were due to the bromide in their molecule structures.更多还原