Skip to main content

Congo Red

ADVERTISEMENT
Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;4-hydroxy-3-[3-methyl-4-[2-methyl-4-[4-(p-tolylsulfonyloxy)phenyl]azo-phenyl]phenyl]azo-naphthalene-2,7-disulfonate
State
State

At room temperature, Congo Red is in a solid state, usually available as a red crystalline powder. It is stable under standard conditions.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.00
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
1.3000g/cm3
Appearence

Congo Red is characterized by its red crystalline powder form. It is an azo dye, notable for its vivid color, which shifts between blue and red according to the pH of the solution it is dissolved in. This appearance makes it recognizable and useful as a pH indicator.

Comment on solubility

Solubility of Disodium 4-Hydroxy-3-[3-Methyl-4-[2-Methyl-4-[4-(p-Tolylsulfonyloxy)phenyl]azo-phenyl]phenyl]azo-naphthalene-2,7-disulfonate

The solubility of disodium 4-hydroxy-3-[3-methyl-4-[2-methyl-4-[4-(p-tolylsulfonyloxy)phenyl]azo-phenyl]phenyl]azo-naphthalene-2,7-disulfonate is influenced by its complex structure and ionic nature. This compound, characterized by multiple sulfonate groups, exhibits unique solubility properties. Here are some key points regarding its solubility:

  • Water Solubility: Due to the presence of multiple sulfonate groups, this compound is generally soluble in water, making it suitable for various aqueous applications.
  • Solvent Compatibility: It may show different solubility behavior in organic solvents, often being less soluble due to steric hindrance from the large organic groups attached.
  • Temperature Effect: The solubility can be temperature-dependent, typically increasing with higher temperatures in aqueous solutions.
  • pH Impact: As a zwitterionic compound, its solubility may also be affected by the pH of the solution, with certain pH levels promoting dissociation and thus increasing solubility.

In summary, the solubility of disodium 4-hydroxy-3-[3-methyl-4-[2-methyl-4-[4-(p-tolylsulfonyloxy)phenyl]azo-phenyl]phenyl]azo-naphthalene-2,7-disulfonate is characterized by its high solubility in water, influenced by its sulfonate groups and structural ingredients. Understanding these factors is crucial for utilizing this compound effectively in various chemical and industrial applications.

Interesting facts

Fascinating Insights into Disodium 4-Hydroxy-3-[3-Methyl-4-[2-Methyl-4-[4-(p-Tolylsulfonyloxy)Phenyl]Azo-Phenyl]Phenyl]Azo-Naphthalene-2,7-Disulfonate

Disodium 4-hydroxy-3-[3-methyl-4-[2-methyl-4-[4-(p-tolylsulfonyloxy)phenyl]azo-phenyl]phenyl]azo-naphthalene-2,7-disulfonate, often referred to as a *dye compound,* provides an intriguing insight into the world of chemical applications in various industries. Here are some noteworthy facts:

  • Colorant Power: This compound is utilized as a dye, valued for its vibrant color and stability, which makes it essential in textiles and plastics.
  • Complex Structure: Its intricate structure includes multiple aromatic systems and azo groups, which contribute to its color properties and functionality.
  • Dual Functionality: Apart from being a dye, the disodium salt form enhances its solubility in water, expanding its potential applications in aqueous environments.
  • Industrial Significance: This compound is often used in research and manufacturing settings, particularly in the production of inks, paints, and paper coatings.
  • Environmental Impact: The use of azo dyes has raised concerns regarding their environmental footprint, leading to ongoing research to improve sustainability in dye production.

The compound’s unique features spark interest not only in its chemical properties but also in its applications across multiple fields. As *scientists and students*, understanding the intricate balance between structure and function can reveal the secrets of effective dye chemistry. According to famous chemist Linus Pauling, “The best way to have a good idea is to have lots of ideas,” and this compound embodies that spirit of creativity in chemistry.


In summary, disodium 4-hydroxy-3-[3-methyl-4-[2-methyl-4-[4-(p-tolylsulfonyloxy)phenyl]azo-phenyl]phenyl]azo-naphthalene-2,7-disulfonate serves as a powerful example of how complex chemical structures can lead to valuable applications across diverse industries, driving innovation and sustainability.

Synonyms
Acid Red 111
6358-57-2
C.I. Acid Red 111, disodium salt
C.I. ACID RED 111
CCRIS 2424
EINECS 228-779-4
86K4T0CSTS
ACID RED FGN
ACID RED F 3GL
CI ACID RED 111
2,7-Naphthalenedisulfonic acid, 3-((2,2'-dimethyl-4'-((4-(((4-methylphenyl)sulfonyl)oxy)phenyl)azo)(1,1'-biphenyl)-4-yl)azo)-4-hydroxy-, disodium salt
DTXSID3044708
2,7-Naphthalenedisulfonic acid, 3-(2-(2,2'-dimethyl-4'-(2-(4-(((4-methylphenyl)sulfonyl)oxy)phenyl)diazenyl)(1,1'-biphenyl)-4-yl)diazenyl)-4-hydroxy-, sodium salt (1:2)
CI 23266
CI ACID RED 111, DISODIUM SALT
C.I. 23266
2,7-Naphthalenedisulfonic acid, 3-[[2,2'-dimethyl-4'-[[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, disodium salt
Disodium 3-((2,2'-dimethyl-4'-((4-(((p-tolyl)sulphonyl)oxy)phenyl)azo)(1,1'-biphenyl)-4-yl)azo)-4-hydroxynaphthalene-2,7-disulphonate
Disodium 3-[[2,2'-dimethyl-4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxynaphthalene-2,7-disulphonate
2,7-Naphthalenedisulfonic acid, 3-[2-[2,2'-dimethyl-4'-[2-[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-4-hydroxy-, sodium salt (1:2)
DTXCID401764279
disodium;4-hydroxy-3-[[3-methyl-4-[2-methyl-4-[[4-(4-methylphenyl)sulfonyloxyphenyl]diazenyl]phenyl]phenyl]diazenyl]naphthalene-2,7-disulfonate
UNII-86K4T0CSTS
2,7-Naphthalenedisulfonic acid,3-[[2,2'-dimethyl-4'-[[4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, disodium salt
COTCTDGJRPYXGL-XZAKBLNDSA-L
AKOS015916399
FA41265
NS00020013
Q27269742