Structural Formula Vector Image
Title: 4¢,5¢-Diiodofluorescein
CAS Registry Number: 38577-97-8
CAS Name: 3¢,6¢-Dihydroxy-4¢,5¢-diiodospiro[isobenzofuran-1(3H),9¢-[9H]xanthen]-3-one
Additional Names: hydroxydiiodo-o-carboxyphenylfluorone; D & C Orange No. 10; C.I. Solvent Red 73; C.I. 45425:1
Molecular Formula: C20H10I2O5
Molecular Weight: 584.10
Percent Composition: C 41.13%, H 1.73%, I 43.45%, O 13.70%
Literature References: Prepd by reaction of fluorescein with I2 and HIO4 or ICl in alkali: Colour Index vol. 4 (3rd ed., 1971) p 4427.
Properties: Orange-red powder. Slightly sol in water; sol in alcohol, in alkali hydroxide solns.
Derivative Type: Sodium salt
Additional Names: Erythrosine Extra Yellowish; D & C Orange No. 11; C.I. Acid Red 95; C.I. 45425
Molecular Formula: C20H8I2Na2O5
Molecular Weight: 628.06
Percent Composition: C 38.25%, H 1.28%, I 40.41%, Na 7.32%, O 12.74%
NOTE: Structure depicted as the open tautomer.
Use: As an adsorption indicator in the determn of iodides in the presence of chlorides and bromides. The salts in dyeing and printing cotton, in printing half-silk, in dyeing jute, straw, etc.

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