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 SAFETY INFORMATION COMPUTED DESCRIPTORS PRODUCT INTRODUCTION RELATED SUPPLIERS

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 Å²
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).