碘化反式-4- [4-（二甲基氨基）苯乙烯基] -1-甲基吡啶鎓（DASPI）是一种半菁染料。反式-4-[4-（二甲基氨基）苯乙烯]-1-甲基吡啶碘（DASP）是一种可作为荧光探针的半氰基染料。可通过调节溶液的pH值而对其荧光属性进行调节。它能被光激发以形成能够实现分子间电荷转移态的内捻。 应用 DASP可用来对分子筛晶体的荧光进行表征，从而进一步用于光功能材料的开发。 trans-4-[4-(Dimethylamino)styryl]-1-methylpyridinium iodide (DASP) is a hemicyanine dye that can be used as a fluorescence probe. Its fluorescent property can be tuned by adjusting the pH of the solution. It can be photoexcited for internal twisting that forms intermolecular charge transfer state. trans-4-[4-(dimethylamino)-styryl]-1-methylpyridinium iodide (DASPI) is a hemicyanine dye. Application： DASP can be used to characterize the fluorescence of zeolite crystals which can further be used in the development of photofunctional materials.