Xu Wei, Chen Hailong, Wang Yanfeng, Zhao Chuntao, Li Xiyou, Wang Shuangqing, Weng Yuxiang
Department of Chemistry, Shandong University, Jinan, 250100, China.
Chemphyschem. 2008 Jul 14;9(10):1409-15. doi: 10.1002/cphc.200800028.
Two compounds containing a porphyrin dimer and a perylene tetracarboxylic diimide (PDI) linked by phenyl (1) or ethylene groups (2) are prepared. The photophysical properties of these two compounds are investigated by steady state electronic absorption and fluorescence spectra and lifetime measurements. The ground state absorption spectra reveal intense interactions between the porphyrin units within the porphyrin dimer, but no interactions between the porphyirn dimer and PDI. The fluorescence spectra suggest efficient energy transfer from PDI to porphyrin accompanied by less efficient electron transfer from porphyrin to PDI. The energy transfer is not affected by the dimeric structure of porphyrin or the linkage between the porphyrin dimer and PDI. However, the electron transfer from porphyrin to PDI is significantly affected by either the linkage between the donor and the acceptor or the polarity of the solvents. The dimeric structure of the porphyrin units in these compounds significantly promotes electron transfer in nonpolar, but not in polar solvents.
制备了两种化合物，其中卟啉二聚体与通过苯基（1）或亚乙基（2）连接的苝四羧酸二酰亚胺（PDI）相连。通过稳态电子吸收光谱、荧光光谱和寿命测量研究了这两种化合物的光物理性质。基态吸收光谱揭示了卟啉二聚体内卟啉单元之间存在强烈相互作用，但卟啉二聚体与PDI之间没有相互作用。荧光光谱表明存在从PDI到卟啉的高效能量转移，同时伴随着从卟啉到PDI的低效电子转移。能量转移不受卟啉的二聚体结构或卟啉二聚体与PDI之间连接的影响。然而，从卟啉到PDI的电子转移受到供体与受体之间的连接或溶剂极性的显著影响。这些化合物中卟啉单元的二聚体结构在非极性溶剂中显著促进电子转移，但在极性溶剂中则不然。
