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Congo Red

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Identification
Molecular formula
C32H22N6Na4O14S4
CAS number
573-58-0
IUPAC name
tetrasodium;4-imino-5-oxo-3,6-bis[[4-(2-sulfonatooxyethylsulfonyl)phenyl]hydrazono]naphthalene-2,7-disulfonate
State
State

At room temperature, Congo Red is found in solid state. It is usually handled in powdered form for its applications as a dye and pH indicator.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
500.00
Boiling point (Kelvin)
773.15
General information
Molecular weight
696.66g/mol
Molar mass
696.6640g/mol
Density
0.8012g/cm3
Appearence

Congo Red appears as a red-brown powder or as a crystalline solid. It is known for its vivid color and is often used as a pH indicator. When in aqueous solution, it exhibits a blue-violet color over a pH range of 3 to 5, turning into a red form as the pH increases.

Comment on solubility

Solubility Insights

The solubility of the compound tetrasodium;4-imino-5-oxo-3,6-bis[[4-(2-sulfonatooxyethylsulfonyl)phenyl]hydrazono]naphthalene-2,7-disulfonate is influenced by several factors, primarily due to its highly ionic nature. This unique structure incorporates multiple sulfonate groups which play a crucial role in its solubilization.

Key points regarding its solubility include:

  • High Solubility in Water: As a salt, this compound is expected to exhibit excellent solubility in water, facilitating its use in aqueous solutions.
  • PH Dependence: The solubility can vary with pH levels; typically, it can dissolve well in neutral to slightly alkaline conditions.
  • Ionic Interactions: Presence of multiple anionic sulfonate groups enhances its ability to interact with polar solvents, promoting solubility.
  • Potential Aggregate Formation: At high concentrations, it may form aggregates or micelles due to hydrophobic interactions between its phenyl moieties.

In summary, the solubility characteristics of this compound make it a valuable component in various applications, particularly in fields requiring efficient dispersion in water. It underscores the importance of understanding ionic solubility when working with complex chemical compounds.

Interesting facts

Discovering Tetrasodium 4-Imino-5-Oxo-3,6-Bis[[4-(2-Sulfonatooxyethylsulfonyl)Phenyl]Hydrazono]Naphthalene-2,7-Disulfonate

Tetrasodium 4-imino-5-oxo-3,6-bis[[4-(2-sulfonatooxyethylsulfonyl)phenyl]hydrazono]naphthalene-2,7-disulfonate is a fascinating compound with unique structural characteristics and applications that make it a topic of interest among chemists.

Key Features and Applications

  • Dye Chemistry: This compound belongs to the category of azo dyes, known for their vibrant colors and applications in dyeing textiles.
  • Versatile Functional Groups: The presence of multiple sulfonate groups allows for an increased water solubility, making it particularly useful in aqueous applications.
  • Colorants in Industry: Due to its strong chromophore, tetrasodium salt forms are often utilized in various industrial processes, particularly in coloring agents.
  • Biological Relevance: Some studies have explored its potential biological activities, revealing possibilities for its use in biomedical fields.

Moreover, understanding the properties of this compound not only aids in its practical applications but also contributes to the broader field of organic and polymer chemistry. Its synthesis and functionalization provide exciting avenues for research and development. As chemical scientists, it is essential to explore and appreciate the intricate balance between structure, function, and application in such compounds.

In summary, tetrasodium 4-imino-5-oxo-3,6-bis[[4-(2-sulfonatooxyethylsulfonyl)phenyl]hydrazono]naphthalene-2,7-disulfonate exemplifies the beauty of chemical diversity, inviting chemists to delve into its molecular architecture and potential applications.