Congo Red Indicator C.I. No. 22120

Chemical Information
Congo Red is an indicator dye that is blue-violet at pH 3.0 and red at pH 5.0. It contains a 3,3'-(biphenyl-4,4'-diyldidiazene-2,1-diyl)bis(4-aminonaphthalene-1-sulfonate). It is functionally related to a 3,3'-(biphenyl-4,4'-diyldidiazene-2,1-diyl)bis(4-aminonaphthalene-1-sulfonic acid).
| CAS Number | 573-58-0 |
| PubChem CID | 11313 |
| IUPAC Name | disodium;4-amino-3-[[4-[4-[(1-amino-4-sulfonatonaphthalen-2-yl)diazenyl]phenyl]phenyl]diazenyl]naphthalene-1-sulfonate |
| Molecular Formula | C32H22N6Na2O6S2 |
| Molecular Weight | 696.7 |
| Topological Polar Surface Area | 233 |
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 12 |
| Rotatable Bond Count | 5 |
| Heavy Atom Count | 48 |
| Formal Charge | 0 |
| Complexity | 1180 |
| Property | Value |
|---|---|
| Molecular Weight | 696.7 |
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 12 |
| Rotatable Bond Count | 5 |
| Exact Mass | 696.08376335 |
| Monoisotopic Mass | 696.08376335 |
| Topological Polar Surface Area | 233 Ų |
| Heavy Atom Count | 48 |
| Formal Charge | 0 |
| Complexity | 1180 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 3 |
| Compound Is Canonicalized | Yes |
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