【摘要】 <正> 具有光致变色现象的席夫碱在过去几十年里一直为人们所感兴趣。一般认为,水杨醛上的邻羟基是这类席夫碱发生光致变色的必要条件。光致变色的过程就是邻羟基的质子转移到亚氨基的氮原子上,随后发生分子内的几何异构,但对此机理仍存在争执。本文主要报道一些席夫碱的电子吸收光谱与分子结构的关系,以及溶剂对电子吸收光谱的影响。更多还原

【Abstract】 Twelve salicylaldehyde anils were synthesized and four of them are novel compounds. Their electronic spectra were determined in different solvents. The relationship between the first absorption band of enol’s and molecular structure were discussed. Blue shift of the first absorption band was caused by polar solvents, especially a protonic solvent. The first singlet excited state was a mixing state of 1(n, π*) and 1(π, π*) state. The influence of solvents on the tautomerism equilibrium of enol-quinonoid was discussed. The result demonstrated that protonic solvent was favourable to the formation of quinonoid.更多还原