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合成了叶啉与酞菁以共价键连接起来的双发色团分子。测定了它们的吸收光谱,荧光光谱,荧光寿命等。计算了分子内能量传递过程的效率(φ_(EnT))及速率常数(κ_(EnT))。结果表明:在稀溶液中,卟啉与酞菁等克分子混合时,观察不到分子间能量传递过程现象的发生;而双发色团分子的分子内能量传递过程则明显发生了,其效率(φ_(EnT)=13～70％)与速率常数(κ_(EnT)=1.2×10~7～2.0×10~8s~(-1))取决于分子的结构类型。电子转移与能量传递过程与介质性质有关。在极性溶剂中有利于电子转移过程的进行,而不利于能量传递过程;在非极性溶剂中,则有利于能量传递过程的进行,而不利于电子转移。 选择性激发酞菁发色团,观测到了只有电子转移发生的过程,其电子转移效率达到38％。
The double chromophore molecules were synthesized by covalent bonds between phyllodipine and phthalocyanine. Their absorption spectra, fluorescence spectra, fluorescence lifetime and so on were measured. The efficiency (φ_ (EnT)) and rate constant (κ_ (EnT)) of intramolecular energy transfer process were calculated. The results showed that the phenomenon of energy transfer between molecules was not observed in the dilute solution when the porphyrin and phthalocyanine were mixed. However, the intramolecular energy transfer of the two chromophore molecules occurred obviously. The efficiency (φ_ (EnT) = 13 ~ 70%) and the rate constant (κ_ (EnT) = 1.2 × 10 ~ 7 ~ 2.0 × 10 ~ 8s -1) depend on the structure type of the molecule. Electron transfer and energy transfer process and the nature of the media. In polar solvents, it is good for the electron transfer process, which is not conducive to the energy transfer process; in non-polar solvents, it is conducive to the energy transfer process, but not conducive to electron transfer. Selective excitation of phthalocyanine chromophores, observed only the occurrence of electron transfer process, the electron transfer efficiency of 38%.