The problem of the carboxylate-phenolate tautomerism of fluorescein monoanion <$E roman HR sup -> in solutions is discussed. While the phenolate tautomer predominates in solutions for 2,4,5,7-tetrahalogen derivatives of fluorescein, the <$E roman HR sup -> form of fluorescein appears in all the systems yet studied exclusively as a species with ionized carboxylic and nonionized hydroxy groups. However, the conversion of a part of <$E roman HR sup -> ions in a phenolate tautomer is expected for fluorescein in strongly differentiating solvents. Really, such a tautomer was revealed vis-spectroscopically in DMSO, using absorption, emission, and excitation in buffer solutions under gradual variation of acidity.

• Мчедлов-Петросян Микола Отарович (1954–) (хімічні науки)
• Саламанова Наталія Валеріївна (хімічні науки)

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