Phosphafluorescein compound or a salt thereof, or fluorescent dye using the same

摘要

General formula: [wherein R 1 represents an optionally substituted aryl group. R2 represents a hydrogen atom or an organic group. R represents a general formula: (wherein R3 represents an aryl group which may be substituted, an alkyl group which may be substituted, an alkenyl group which may be substituted, or an alkynyl group which may be substituted). R4 represents an optionally substituted alkyl group.). The phosphafluorescein compound or a salt, hydrate, or solvate thereof represented by the above can obtain a sufficient quantum yield while having an absorption maximum wavelength and a fluorescence maximum wavelength at 600 to 700 nm. Can reduce HOMO sufficiently.