573-58-0
Product Name:
Congo Red
Formula:
C32H22N6Na2O6S2
Synonyms:
Congo Red;Direct Red 28;Direct Red R;Direct Red Y;3,3?-[(1,1?-Biphenyl)-4,4?-diylbis(azo)]bis(4-amino-1-naphthalenesulfonic Acid) 2Na
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Red to red-brown solid; [ChemIDplus] Yellowish-red in water or orange in ethanol; [HSDB] |
|---|---|
| Color/Form | BROWNISH-RED POWDER; IN WATER YELLOWISH-RED & IN ETHANOL ORANGE |
| Odor | ODORLESS |
| Melting Point | >360 °C |
| Solubility | Sol in ethanol; very slightly sol in acetone; practically insol in ether |
| pH | SOLN HAVE PH OF 8-9.5 |
| Other Experimental Properties | Decomposes on exposure to acid fumes. |
| Chemical Classes | Dyes -> Benzidine Dyes |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Health Hazard GHS08 |
| GHS Hazard Statements |
H350:Carcinogenicity |
| Precautionary Statement Codes |
P201:Obtain special instructions before use. P202:Do not handle until all safety precautions have been read and understood. P280:Wear protective gloves/protective clothing/eye protection/face protection. P308+P313:IF exposed or concerned: Get medical advice/attention. P405:Store locked up. P501:Dispose of contents/container to..… |
COMPUTED DESCRIPTORS
| Molecular Weight | 696.7 g/mol |
|---|---|
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 12 |
| Rotatable Bond Count | 5 |
| Exact Mass | 696.08376335 g/mol |
| Monoisotopic Mass | 696.08376335 g/mol |
| 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 |
PRODUCT INTRODUCTION
description
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).