Antenna Effects of Dendric Mjultichromophore Arrays and Photochemical Tandem Reaction

通过三年的研究得到以下信息：1在树枝状大分子的外围芳香基团上吸收的激发能以80%的高效率传递到树枝状大分子中心的卟啉。当树枝状聚合物的形态为非球形时，效率降低到球形树枝状聚合物的30%以下。荧光各向异性的测量结果表明，树枝状大分子的激发能在树枝状大分子之间发生了高速迁移，由卟啉组成的树枝状大分子吸收的可见光能量也有70%以上转移到焦点。从能量转移效率的形态依赖性和荧光各向异性的测量中得到了与1相似的结论。高效能量泛函的一般指导方针之一是设计光功能分子的球形取向，并证明了树枝状大分子的高效用。

The following information was obtained through researches in three years.1 Excitation energy absorbed at peripheral aromatic groups was transmitted to the porphyrin at the center of the dendrimer in 80% of the high efficiency. The efficiency decreased to less than 30% of the globular dendrimer when the morphology of the dendrimer was non-globular. High-speed migration of excitation energy between dendrons was suggested from the measurement of fluorescence anisotropy.The energy of visible light absorbed into the dendrimers composed from porphyrins also transferred to the focal point more than 70%. Similar conclusion as 1 was obtained from the morphology dependency of the energy transfer efficiency and the measurement of fluorescence anisotropy.One of the general guidelines for highly efficient energy funneling was the design of spherical orientation of photofunctional molecules and the high utility of dendrimers was demonstrated.