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Congo Red

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Identification
Molecular formula
C32H22N6Na4O14S4
CAS number
573-58-0
IUPAC name
tetrasodium;2-[[4-[[4-[(6-anilino-2-hydroxy-3-sulfonato-1-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]benzene-1,4-disulfonate
State
State

At room temperature, Congo Red is a solid. It is typically found in the form of a powder or granules.

Melting point (Celsius)
357.00
Melting point (Kelvin)
630.15
Boiling point (Celsius)
620.00
Boiling point (Kelvin)
893.15
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.9803g/cm3
Appearence

Congo Red appears as a dark red powder or granular solid. It is known for its intense red coloration and is often used as a pH indicator, changing color from blue at pH 3.0 to red at pH 5.2.

Comment on solubility

Solubility of Tetrasodium; 2-[[4-[[4-[(6-anilino-2-hydroxy-3-sulfonato-1-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]benzene-1,4-disulfonate

This compound exhibits distinctive solubility characteristics, primarily attributed to its ionic and sulfonate functional groups. The presence of multiple sulfonate groups contributes significantly to its water solubility. Here are some key points regarding its solubility:

  • High Solubility in Water: Being a tetrasodium salt, the compound readily dissolves in aqueous solutions, making it suitable for various applications in water-based formulations.
  • Influence of pH: The solubility may vary with pH levels; alkaline conditions generally enhance its solubility due to increased ionization.
  • Temperature Dependence: Typically, solubility can increase with temperature, implying that higher temperatures may facilitate greater dissolution rates.
  • Solvent Interactions: While highly soluble in water, the compound may experience reduced solubility in organic solvents due to the polar nature of its structure.

In summary, the solubility of this compound is markedly influenced by its ionic nature, crystalline structure, and environmental conditions such as pH and temperature. Understanding these solubility dynamics is crucial for its effective integration into various chemical processes and applications.

Interesting facts

Interesting Facts about Tetrasodium 2-[[4-[[4-[(6-anilino-2-hydroxy-3-sulfonato-1-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]benzene-1,4-disulfonate

Tetrasodium 2-[[4-[[4-[(6-anilino-2-hydroxy-3-sulfonato-1-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]benzene-1,4-disulfonate is a fascinating chemical compound with a variety of applications and characteristics. Here are some notable aspects:

  • Azo Dye Compound: This compound belongs to the azo dye category, which means it contains the azo group (–N=N–), making it an important player in the dye industry.
  • Coloring Agent: It is widely used as a coloring agent in textiles, plastics, and food products, providing vibrant hues and water solubility.
  • Biocompatibility: One of the key features of this compound is its relative biocompatibility compared to other synthetic dyes, making it a preferred choice in biomedical applications.
  • Environmental Considerations: Researchers are focusing on the environmental impact of azo dyes, including the need for effective wastewater treatment techniques to prevent pollution.
  • Analytical Chemistry: It is often utilized in analytical procedures, such as colorimetric assays, due to its clear staining properties and stability under various conditions.

As scientists continue to explore the diverse applications and effects of this compound, they are uncovering the complexities of its interactions with biological and environmental systems. As we move towards more sustainable practices, innovations surrounding tetrasodium 2-[[4-[[4-[(6-anilino-2-hydroxy-3-sulfonato-1-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]benzene-1,4-disulfonate and similar compounds hold promise for the future of chemistry.

Synonyms
Ismafast Blue 4GL
EINECS 219-708-8
1,4-benzenedisulfonic acid, 2-(2-(4-(2-(4-(2-(1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl)diazenyl)-1-naphthalenyl)diazenyl)-6-sulfo-1-naphthalenyl)diazenyl)-, sodium salt (1:4)
1,4-benzenedisulfonic acid, 2-[2-[4-[2-[4-[2-[1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl]diazenyl]-1-naphthalenyl]diazenyl]-6-sulfo-1-naphthalenyl]diazenyl]-, sodium salt (1:4)
Tetrasodium;2-[[4-[[4-[(6-anilino-2-hydroxy-3-sulfonatonaphthalen-1-yl)diazenyl]naphthalen-1-yl]diazenyl]-6-sulfonatonaphthalen-1-yl]diazenyl]benzene-1,4-disulfonate