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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
4-amino-3-[4-[4-[(1-amino-4-sulfo-2-naphthyl)azo]-3-methyl-phenyl]-2-methyl-phenyl]azo-naphthalene-1-sulfonic acid
State
State

At room temperature, Congo Red is in a solid state, typically found as a powder. It dissolves in water to give a red solution, which is the basis for its use as a dye in various applications.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.9837g/cm3
Appearence

Congo Red appears as a red-brown powder. It is known for its vivid red color when used as a dye. Congo Red is colorfast and exhibits a distinctive red hue that changes to blue when exposed to acidic conditions, due to its pH indicator property.

Comment on solubility

Solubility of 4-amino-3-[4-[4-[(1-amino-4-sulfo-2-naphthyl)azo]-3-methyl-phenyl]-2-methyl-phenyl]azo-naphthalene-1-sulfonic acid

This compound, known for its complex structure, exhibits notable solubility characteristics that are essential to its functionality in various applications. The solubility of such azo compounds often depends on several factors, including:

  • Functional Groups: The presence of sulfonic acid groups enhances water solubility dramatically, as these groups are highly polar and can engage in hydrogen bonding with water molecules.
  • Hydrophobic Effects: Although certain portions of the molecule may present hydrophobic characteristics due to its naphthyl and phenyl rings, the overall balance created by polar and non-polar regions defines its solubility.
  • pH Dependency: The solubility in water can be affected by the pH of the solution, particularly due to the ionization of the sulfonic acid group, which can be more soluble at lower pH values.

In general, compounds similar to 4-amino-3-[4-[4-[(1-amino-4-sulfo-2-naphthyl)azo]-3-methyl-phenyl]-2-methyl-phenyl]azo-naphthalene-1-sulfonic acid are typically soluble in water, especially when formulated as aqueous solutions, given the strong ionic nature of the sulfonic acid group. However, practical solubility may require consideration of temperature, concentration, and other solvent properties to optimize dissolution. It's essential to note that while *solubility* can reflect affinities in polar solvents, contrasting behaviors may be observed in non-polar solvents where solubility tends to decrease.

Interesting facts

Interesting Facts about 4-Amino-3-[4-[4-[(1-amino-4-sulfo-2-naphthyl)azo]-3-methyl-phenyl]-2-methyl-phenyl]azo-naphthalene-1-sulfonic Acid

4-amino-3-[4-[4-[(1-amino-4-sulfo-2-naphthyl)azo]-3-methyl-phenyl]-2-methyl-phenyl]azo-naphthalene-1-sulfonic acid is a complex organic compound belonging to the azo dye family. It is characterized by its striking color and is predominantly used in various applications, ranging from dyes to biological studies. Here are some notable facts about this fascinating compounds:

  • Azo Dyes: This compound contains azo functional groups (-N=N-), which are renowned for their vivid colors. Azo dyes play a significant role in the textile industry for coloring fabrics.
  • Biological Applications: The compound's structure allows for potential applications in biological staining and imaging techniques, where visualization of specific cellular components is essential.
  • Sulfonic Groups: The presence of sulfonic acid groups in its structure enhances water solubility, making it useful in various aqueous applications, including as a dye in printing and textile processes.
  • Environmental Considerations: While azo dyes are widely used, it is important to be aware of their environmental impact. Some azo compounds can decompose into harmful amines, necessitating careful management in industrial applications.
  • Innovation in Chemistry: Researchers are continuously exploring modifications to azo compounds like this one to improve colorfastness and reduce toxicity, indicating the ongoing relevance of such compounds in chemical research.

As an interdisciplinary compound, 4-amino-3-[4-[4-[(1-amino-4-sulfo-2-naphthyl)azo]-3-methyl-phenyl]-2-methyl-phenyl]azo-naphthalene-1-sulfonic acid showcases the intricate connections between chemistry, biology, and industry. As highlighted by one chemist, “The beauty of azo compounds lies not just in their colors, but also in their diverse applications and ongoing research possibilities.”

Synonyms
Red rspc
Benzopurpurin B free acid
G0E6YYC47J
UNII-G0E6YYC47J
1733-14-8
Naphthionic acid, 3,3'-(3,3'-dimethyl-4,4'-biphenylylenebisazo)di-
1-Naphthalenesulfonic acid, 3,3'-((3,3'-dimethyl(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(4-amino-
1-Naphthalenesulfonic acid, 3,3'-((3-methylene(1,1'-biphenyl)-4,4'-diyl)bis(2,1-diazenediyl))bis(4-amino-
3,3'-((3-Methylene(1,1'-biphenyl)-4,4'-diyl)bis(2,1-diazenediyl))bis(4-amino-1-naphthalenesulfonic acid)
NSC5015
1-Naphthalenesulfonic acid, 3,3'-[(3,3'-dimethyl[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[4-amino-
3,3'-[(3-Methylene[1,1'-biphenyl]-4,4'-diyl)bis(2,1-diazenediyl)]bis[4-amino-1-naphthalenesulfonic acid]
CHEMBL1621097
SCHEMBL11922531
SCHEMBL19154084
CHEBI:92247
DTXSID80859573
HSCI1_000315
BRD-K14221570-236-01-1
Q27164013
4-amino-3-[(E)-[4-[4-[(E)-(1-amino-4-sulfo-2-naphthyl)azo]-3-methyl-phenyl]-2-methyl-phenyl]azo]naphthalene-1-sulfonic acid
4-amino-3-[4-[4-[(1-amino-4-sulfo-2-naphthalenyl)azo]-3-methylphenyl]-2-methylphenyl]azo-1-naphthalenesulfonic acid