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

doi:10.7517/j.issn.1674-0475.1993.01.79

Abstract

Abstract: 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 (I_ex,/I_m) 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.

Key words: 4’-formyl-4-stilbazole, aggregation, excited aggregation state

CHANG ZHI-YING, LI MIAO-ZHEN, NIE JMN, WANG ER-JIAN. SPECTROSCOPIC STUDY ON MOLECULAR AGGREGATION BEHAVIOR OF 4’-FORMYL-4-STILBAZOLE[J]. Imaging Science and Photochemistry, 1993, 11(1): 79-84.

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

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