Chlorophyll and bacteriochlorophyll pigments are important porphyrinoids, which play key roles in light absorption, energy migration/transfer, and electron transfer in natural photosynthesis. Dyads of such pigments have attracted much attention from the viewpoints of mimicking photosynthetic light-harvesting and charge-separating systems. In this study, we report the synthesis and optical properties of heterodyads of zinc chlorin and free-base bacteriochlorin covalently linked by linear rigid substituents at the 20-position, which were prepared from naturally occurring chlorophyll-a. A free-base bacteriochlorin moiety accepted the singlet excitation energy from the zinc chlorin in the heterodyads. In the co-aggregate systems of heterodyads with chlorosomal self-assemblies, the latter transfers the singlet excitation energy to the bacteriochlorin moiety of the former, which are useful for artificial chlorosomal supramolecular light-harvesting systems.

叶绿素和细菌叶绿素是重要的卟啉类，它们在自然光合作用的光吸收，能量迁移/转移和电子转移中起关键作用。从模仿光合作用的光收集和电荷分离系统的观点来看，这类颜料的二元化合物引起了很多关注。在这项研究中，我们报告了由天然存在的叶绿素a制备的锌二氢卟酚锌和游离碱细菌二氢卟啉的杂合体的合成和光学性质，这些杂合二价在20位上通过线性刚性取代基共价连接。。游离碱菌绿素部分接受杂合体中二氢卟酚锌的单重态激发能。在杂合体与绿体自组装体的共聚集系统中，后者将单重态激发能转移至前者的细菌二氢卟酚部分，这对于人工绿体超分子光捕集系统很有用。