| Identification | Back Directory | [Name]
CI 45350 | [CAS]
518-45-6 | [Synonyms]
KI202(1)
KI202(2)
Fluoresceine 94
C.I.Solvent Yellow 94:C.I.45350:1
3',6'-dihydroxyspiro[2-benzofuran-3,9'-xanthene]-1-one
3',6'-dihydroxyspiro[isobenzofuran-3,9'-xanthene]-1-one | [Molecular Formula]
C20H12O5 | [MDL Number]
MFCD00005050 | [MOL File]
518-45-6.mol | [Molecular Weight]
332.306 |
| Chemical Properties | Back Directory | [Boiling point ]
662.571±55.00 °C(Press: 760.00 Torr)(predicted) | [density ]
1.535±0.10 g/cm3(Temp: 25 °C; Press: 760 Torr)(predicted) | [pka]
4.402±0.10(predicted) |
| Hazard Information | Back Directory | [Definition]
ChEBI: Fluorescein (acid form) is a xanthene dye that is highly fluorescent and commonly used as a fluorescent tracer. It has a role as a radioopaque medium and a fluorescent dye. It is a xanthene dye, a member of benzoic acids, a hydroxy monocarboxylic acid, a cyclic ketone, a member of phenols and an organic heterotricyclic compound. | [Preparation]
Resorcinol and Phthalic anhydride alone or in the presence of sulfuric acid Zinc chloride or condensation, namely for fluorescein, again into free acid. | [Properties and Applications]
yellow. Soluble in water and ethanol as yellow, with strong green fluorescence. In concentrated sulfuric acid to yellow, with weak fluorescence, dilution after yellow, with yellow precipitation. Dye aqueous solution to join sodium hydroxide color dark, with dark green fluorescence. The dye for C.I. Acid Yellow 73 free Acid. Used in cosmetics coloring.
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Standard
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Light Fastness
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Heat-resistant(℃)
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water
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Sodium Carbonate(5%)
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Hydrochloric acid(5%)
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Melting point
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Stable
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ISO
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Poor
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Insoluble
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General
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No change
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