新型卟啉-酞菁二元分子内光物理过程的研究

合成了以哌嗪连接的含卟啉－酞菁的双发色团分子，测定了它的吸收光谱，荧光光谱和荧光寿命。并计算了在不同溶剂中两发色团之间的能量传递效率ΦＥｎＴ和电子转移效率ΦＥＴ。结果表明：在非极性溶剂苯中，两发色团之间的光物理过程以激发态单线态能量传递为主（ΦＥｎＴ８０％）。而在极性溶剂ＤＭＦ中，则以电子转移为主（ΦＥＴ６９．８％）。该二元化合物在ＤＭＦ中，哌嗪以船式构象存在，我们以前合成的以氧或柔性链连接的二元

The Photophysical Process of A New Kind of Porohyrin-Phthalocyanine Heterodimer

Intramolecular energy-transfer and electron-transfer of porphyrin-phthalocyanine heterodimer, linked by piperazine, were investigated by absorption and fluorescencc spectroscopy.The efficiency of energy transfer(EnT) and electron transfer (ET) were calculated. The results indicate that: In benzene, the main photophysical process is excited singlet-singlet energy transfer, while in DMF photoinduced electron transfer Predominant. The ET of this heterodimer in DMF is bigge1i than that of porphyrin-phthalocyanine heterodimers linked by oxygen or flexible chains. This Inay be ascribed to the "boat-form" conformation of piperazine, According to the CPK molecular model, porphyrin and phthalocyanine are held together in a face to face way, and the center to center distance between two macrorings is about 3.56A. It is suggested that, conformational changes from "chair form" to "boat form" occurred subsequent to optical excitation in DMF.