Abstract
2-Substituted 6-, 7- or 8-methoxyquinoline-4-carboxylic acid derivatives were synthesized. The fluorescence quantum yield (Φ) of these compounds increased in the order, 2-thioxo-, 2-methylthio-, 2-methylsulfinyl-, 2-methylsulfonyl derivatives of 6-methoxyquinoline-4-carboxylic acid. Ethyl 6-methoxy-2-methylsulfonylquinoline-4-carboxylate (ΦCH3CN=0.74 or ΦEtOH=0.69) showed a much higher fluorescence quantum yield than those (ΦCH3CN=0.19 or ΦEtOH=0.19 and ΦCH3CN=0.16 or ΦEtOH=0.05) of the 7- and 8-methoxy derivatives in both acetonitrile and ethanol.
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