【摘要】 我们合成了以不同链长连接的荧光素酯与蒽甲酸酯的四种二元化合物.在溶液中的构象研究表明.链呈不同程度的弯曲.但分子内两个发色团的相互作用是微弱的.激发蒽甲酸酯时,无论是在分子间还是在分子内,其单重态能量几乎都传递给了荧光素酯.激发荧光素酯时,并未观测到分子内的光致电子转移,尽管计算和模型化合物分子间的对照实验都表明它们之间是可以发生这种电子转移的.最可能的原因是这个系列在溶液中,分子内的两个发色平面没有好的匹配,或者说,这些二元化合物在所研究的溶液中,不能满足分子内的光致电子转移对构象的要求.更多还原

【Abstract】 Four diads of fluoresoein and anthraoenecarboxylic acid with different spacer length were synthesized. The conformation analysis indicated that there is some weak interaction between the moieties in the diads due to the flexibility of the spacers. When the anthracene(?)arboxylic ester was excited, it was found that its singlet excited energy was almost totally transfered to the fluorescein inter-and intramolecularly. However, the excitation of fluorescein in the diads did not induce the intramolecular electron transfer reaction, in spite of that both the calculation and the intermolecular experiment of their models showed that this photoinduced electron transfer reaction can occur. Lack of the intramolecular electron transfer might be reasonable in view of that the chromophoric planes of the moieties in the diads do not match with each other, or in other word, the conformation of this diada in solution does not meet the requirement for the intramolecular photoinduced electron transfer reaction.更多还原