Congo red, powder

Supplier: MP BIOMEDICALS (FKA ICN BIOMED
Danger

Synonyms: Disodium 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis(4-aminonaphthalene-1-sulfonate)Sodium 3,3'-([1,1'-biphenyl]-4,4'-diylbis(diazene-2,1-diyl))bis(4-aminonaphthalene-1-sulphonate)Direct Red 28Sodium 3,3'-([1,1'-biphenyl]-4,4'-diylbis(diazene-2,1-diyl))bis(4-aminonaphthalene-1-sulfonate)Disodium 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis(4-aminonaphthalene-1-sulphonate)CI 22120

0210509990 0210509925 0210509980
IC10509990EA 273.7 USD
IC10509990 IC10509925 76102-650
Congo red, powder
Congo Red

Congo red is the sodium salt of 3,3'-([1,1'-biphenyl]-4,4'-diyl)bis(4-aminonaphthalene-1-sulfonic acid). It is a secondary diazo dye. It is absorption indicator for halide and thiocyanate determinations.


  • UV/Visible Absorbance : λ max (water): 497 ± 3nm
  • Presentation : Red Powder
  • pH : Visual Transition Interval: From pH 3.0 (blue) to pH 5.2 (red).
  • Solubility : Soluble in water,ethanol; very slightly soluble in acetone; practically insoluble in ether; slightly soluble in acetic acid.

Formula: C₃₂H₂₂N₆Na₂O₆S₂
MW: 696.67 g/mol
Melting Pt: >360 °C (lit.)
Storage Temperature: Ambient
MDL Number: MFCD00004028
CAS Number: 573-58-0
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Specification Test Results

Identity Test Passes
UV/Vis: l max (water) 497 ± 3nm

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