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考察10种2-取代苯乙烯基苯并噻唑的紫外吸收光谱，发现随取代基共扼效应的增强，吸收带红移，位移量△λ与衡量共轭效应的取代基常数△σ（△＝σP-σm）之间符合Hammett方程。
The UV absorption spectra of ten kinds of 2-substituted styrylbenzothiazoles were investigated. It was found that with the enhancement of the conjugate effect of the substituents, the absorption band shifts red shifted by △ λ and the substituent constant △ σ (△ = σP-σm) between the Hammett equation.