4, 4-ジアシルアミノスチルベン-2, 2-ジスルホン酸ナトリウム水溶液の光安定性とケイ光強度 : ケイ光増白剤に関する研究 (第2報)

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The fluorescent whitening agents in (3) were synthesized. Specimen solutions of 2.00 × 10-5mol/l of (3) were irradiated at 30±0.2°C for one hour with blacklight (360 mμ). Before and after the irradiation, the uv absorption spectra, fluorescence spectra and the tic of the solutions were examined. R-C_??_O-H-N-SO3Na-CH_??_CH-SO3Na-H-N-C_??_O-R Results : With the Rs belonging to unconjugated substituent groups like methyl, n-propyl, n-heptyl, benzyl, and cyclohexyl, (3) proved unstable to uv light, showing a photochemical change which was presumed to be trans-cis isomerization. On the other hand, with the Rs belonging to conjugated substituent groups, like phenyl, o-and p-methoxyphenyl, o, m and p-chlorophenyl, o-and p-nitrophenyl, vinyl, and styryl radicals, (3) proved stable to uv light. Fluorescence intensity was remarkably lower in the second group of substituents than in the first.
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