Eosine Yellowish--(YS)

Title: Eosine Yellowish¾(YS)
CAS Registry Number: 17372-87-1
CAS Name: 2¢,4¢,5¢,7¢-Tetrabromo-3¢,6¢-dihydroxyspiro[isobenzofuran-1(3H),9¢-[9H]xanthen]-3-one disodium salt
Additional Names: 2¢,4¢,5¢,7¢-tetrabromofluorescein; bromoeosine; tetrabromofluorescein sol; bromofluoresceic acid; eosin; eosine; eosin Y; D & C Red No. 22; C.I. Acid Red 87; C.I. 45380
Molecular Formula: C20H6Br4Na2O5
Molecular Weight: 691.85
Percent Composition: C 34.72%, H 0.87%, Br 46.20%, Na 6.65%, O 11.56%
Literature References: Xanthene dye capable of photodynamic generation of singlet oxygen. Prepd by bromination of fluorescein: Colour Index vol. 4 (3rd ed., 1971) p 4426. Photodynamic injury to leaf tissue and inhibition of photosynthesis: J. P. Knox, A. D. Dodge, Planta 164, 22; 30 (1985). Review: H. J. Conn's Biological Stains, R. D. Lillie, Ed. (Williams & Wilkins, Baltimore, 9th ed., 1977), pp 342-344.
Properties: Red crystals with bluish tinge, or brownish-red powder. Freely sol in water, less in alcohol. Insol in ether. The concd aq soln is deep brownish-red, the dilute (1:500) soln is yellowish-red with greenish fluorescence; the alcoholic soln exhibits a strong green fluorescence.
Derivative Type: Free acid
Additional Names: Eosine acid; D & C Red No. 21; C.I. Solvent Red 43; C.I. 45380:2
Molecular Formula: C20H8Br4O5
Molecular Weight: 647.89
Percent Composition: C 37.08%, H 1.24%, Br 49.33%, O 12.35%
Properties: Bright yellowish red. Sol in acetone, ethanol. Insol in mineral oil, toluene.
Use: In microbiological differential media. Colorant in drugs and cosmetics such as lipstick and nail-polish; dyeing wool, silk and paper; in red inks; as biological stain.
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