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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;6-amino-5-[4-[4-[(2-amino-8-hydroxy-5-sulfonato-1-naphthyl)azo]phenyl]phenyl]azo-4-hydroxy-naphthalene-1-sulfonate
State
State

At room temperature, Congo Red is typically encountered as a crystalline powder. It is frequently used in its powdered form for various applications, including as a dye and pH indicator.

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
1.0000g/cm3
Appearence

Congo Red appears as a red-brown to red powder. It is known for its vibrant red coloration, especially in aqueous solutions and is often used as a textile dye.

Comment on solubility

Solubility of Disodium 6-Amino-5-[4-[4-[(2-Amino-8-Hydroxy-5-Sulfonato-1-Naphthyl)Azo]Phenyl]Phenyl]Azo-4-Hydroxy-Naphthalene-1-Sulfonate

The solubility of this compound in various solvents is influenced by its specific chemical structure, particularly the presence of sulfonate groups which generally enhance solubility in water. Here are some insights regarding its solubility:

  • Water Solubility: Given the sulfonate functional groups, it is expected that this compound will exhibit high solubility in water. This is primarily due to the ionization of the sulfonate groups that interact favorably with water molecules.
  • Solvent Polarity: The solubility may vary in solvents of different polarities. Polar solvents will likely dissolve the compound better than non-polar solvents due to similar polar interactions.
  • Temperature Influence: Like many compounds, increased temperature can enhance solubility. Typically, higher temperatures increase kinetic energy, allowing for greater interaction between the solute and solvent.
  • pH Dependence: The solubility might also depend on pH conditions. Adjusting the pH can affect the ionization state of the functional groups, hence altering solubility.
  • Common Applications: In many applications, especially in dye industry and biological settings, the solubility of such compounds is crucial for their effectiveness.

In conclusion, the solubility of Disodium 6-Amino-5-[4-[4-[(2-Amino-8-Hydroxy-5-Sulfonato-1-Naphthyl)Azo]Phenyl]Phenyl]Azo-4-Hydroxy-Naphthalene-1-Sulfonate is primarily characterized by its strong affinity for water, making it a hydrophilic compound suitable for various aqueous applications.

Interesting facts

Interesting Facts about Disodium 6-amino-5-[4-[4-[(2-amino-8-hydroxy-5-sulfonato-1-naphthyl)azo]phenyl]phenyl]azo-4-hydroxy-naphthalene-1-sulfonate

This compound, often recognized in the field of dyes and pigments, showcases the fascinating interplay between chemistry and artistry. Known as a vibrant azo dye, it serves a variety of applications ranging from textiles to food products. Here are some intriguing aspects of this complex compound:

  • Structural Complexity: The structure contains multiple aromatic rings and functional groups, which contribute to its color properties and reactivity.
  • Colorful Chemistry: Azo compounds are known for their bright colors, resulting from the presence of the azo group (–N=N–), which allows for electron delocalization and vibrant light absorption.
  • Application Versatility: This dye can be employed in a multitude of industries, including:
    • Textile dyeing
    • Food coloring
    • Biological staining in microscopy
    • Pharmaceuticals
  • Environmental Considerations: While azo dyes can be highly effective, some derivatives have raised concerns regarding their toxicity and environmental impact, prompting research into safer alternatives.
  • Historical Relevance: The development of azo dyes revolutionized the color industry in the 19th century and continues to influence modern dye chemistry.

As a scientist or chemistry student, exploring compounds like this can deepen your understanding of chemical interactions and their implications in real-world applications. The balance between functionality and safety remains a crucial area of study in the dye industry. As you delve into the world of chemical compounds, remember the role they play in both enhancing aesthetics and posing challenges for sustainability.

Synonyms
Direct Violet R
sodium 5,5'-((1E,1'E)-[1,1'-biphenyl]-4,4'-diylbis(diazene-2,1-diyl))bis(6-amino-4-hydroxynaphthalene-1-sulfonate)
Violet prima 1 [Czech]
CCRIS 2413
Violet prima 1
NSC 75778
2-Naphthalenesulfonic acid, 5,5'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(6-amino-4-hydroxy-,disodium salt
2-Naphthalenesulfonic acid, 5,5'-(4,4'-biphenylylenebis(azo))bis(6-amino-4-hydroxy-, disodium salt
2-Naphthalenesulfonic acid, 5,5'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(6-amino-4-hydroxy-, disodium salt