Congo Red

C₃₂H₂₂N₆Na₂O₆S₂

IUPAC: Congo red

CAS: 573-58-0

Overview

Congo red is an azo dye historically important as the first direct dye for cotton. In medicine, it is used to detect amyloid protein deposits.

Composition

Element Symbol Atoms Atomic Mass
Hydrogen H 22 1.0080
Carbon C 32 12.0110
Nitrogen N 6 14.0070
Oxygen O 6 15.9990
Sodium Na 2 22.9900
Sulfur S 2 32.0600

Elemental Composition

H
Hydrogen ×22
3.2%
C
Carbon ×32
55.2%
N
Nitrogen ×6
12.1%
O
Oxygen ×6
13.8%
Na
Sodium ×2
6.6%
S
Sulfur ×2
9.2%

Uses

  • • Amyloid detection stain
  • • pH indicator (blue pH 3, red pH 5)
  • • Historical textile dye

Fun Facts

  • ✦ Named to exploit public interest in the Congo Free State to boost sales in the 1880s

Safety

  • ⚠ Possible carcinogen (azo dye)

Structure

SMILES

C1=CC=C2C(=C1)C(=CC(=C2N)N=NC3=CC=C(C=C3)C4=CC=C(C=C4)N=NC5=C(C6=CC=CC=C6C(=C5)S(=O)(=O)[O-])N)S(=O)(=O)[O-].[Na+].[Na+]

Properties

Type
organic
State
solid
Molar Mass
696.66 g/mol
Solubility
very soluble

Molecular Descriptors

Exact Mass
696.0838
TPSA
233.0 Ų
H-Bond Donors
2
H-Bond Acceptors
12
Rotatable Bonds
5
Heavy Atoms
48
Complexity
1180.0

Related Compounds

1,2-Dichloroethane

C₂H₄Cl₂

1,3-Butadiene

C₄H₆

1,4-Dioxane

C₄H₈O₂

1-Butanol

C₄H₁₀O

2-Propanol

C₃H₈O

Acetaldehyde

CH₃CHO

Acetamide

C₂H₅NO

Acetic Anhydride

C₄H₆O₃

Acetone

(CH₃)₂CO

Acetonitrile

C₂H₃N

Frequently Asked Questions

What is Congo Red?
Congo Red (C₃₂H₂₂N₆Na₂O₆S₂) is a organic compound with the IUPAC name Congo red.
What is the molecular weight of Congo Red?
Congo Red has a molar mass of 696.66 g/mol.
What state is Congo Red at room temperature?
Congo Red is a solid at room temperature.
Is Congo Red organic or inorganic?
Congo Red is classified as an organic compound.
What elements make up Congo Red?
Congo Red (C₃₂H₂₂N₆Na₂O₆S₂) is composed of Hydrogen (H), Carbon (C), Nitrogen (N), Oxygen (O), Sodium (Na), Sulfur (S).