4-甲酰基4-苯乙烯基吡啶分子聚集行为的光谱研究

SPECTROSCOPIC STUDY ON MOLECULAR AGGREGATION BEHAVIOR OF 4'-FORMYL-4-STILBAZOLE

苯乙烯基吡啶化合物,由于它可能在医学方面和光电子功能材料方面有实际应用前景,已引起人们的兴趣。苯乙烯吡啶化合物的光化学性质类似于二苯乙烯化合物,在光照下可以发生顺-反异构反应、加成反应和二聚反应等不同的光化学反应。

Molecular aggregation of 4'-formyl-4-stilbazole compound (FSA) and its different sails were studied in the aqueous solution by electron spectrophotometry.A new absorption band at 360 nm resulted from the aggregation state of FSA was observed in differential spectra and disappeared quickly upon UV irradiation.The excimer fluorescence band of FSA was located at around 490 nm along with monomer emission band at 410 nm. The ratio of the intensity (Iex,/Im) raises obviously with increasing concentration of FSA. The aggregation of FSA occurs more intensively in the salt form-than in the free base form and varys with different counter ions.Addition of polymer PAA, PVP and PSA to the FSA system leads to more favorable for excimer formation due to the dramatic increase in a local concentration of FSA by intermo-lecular association with the polymer chain.