3-Aminoisocarbostyril誘導体の螢光特性その1

概要

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Fluorescent characteristics of 3-aminoisocarbostyril derivatives were examined from the viewpoint of the substituent effect in comparison with 3-aminoisocarbostyril (Ia) as a parent compound. 3-Amino-(Ib-f, IIIa, b) and 3-substituted aminoisocarbostyril derivatives (IIa-e) gave larger fluorescence quantum yields in ethanol than that of Ia. The fluorescence quantum yield of Ia was increased by the replacement of methoxy and alkylamino groups at C_7 and C_3,respectively. It was suggested that the basicity of C_3-amino group may play an important part for the enhancement of their fluorescence. On the other hand, the fluorescence quantum yields of 2-amino-3-hydrazinoisocarbostyril derivatives (IVa-f) were negligibly small. On the basis of the consideration of the fluorescence and phosphorescence spectral data, it was assumed that the decrease in the fluorescence quantum yields of IVa-f was attributed to the intersystem crossing from ^1(ππ^*) to ^3(ππ^*).
公益社団法人日本薬学会の論文
1983-12-25