Antenna Effects of Dendric Mjultichromophore Arrays and Photochemical Tandem Reaction

通过三年的研究，获得了以下信息外围芳香基团吸收的激发能以80%的高效率传递到树状大分子中心的卟啉上。当枝状大分子形态为非球状时，效率下降到不到球状枝状大分子的30%。荧光各向异性的测量表明树突间存在激发能的高速迁移。吸收到由卟啉组成的树状大分子中的可见光能量也有70%以上转移到焦点上。从能量传递效率的形态依赖性和荧光各向异性的测量得到与1相似的结论。光功能分子的球形取向设计是实现高效能量漏斗化的基本原则之一，树状大分子具有很高的实用性。

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.