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Congo Red

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Identification
Molecular formula
C32H22N6O6S2
CAS number
573-58-0
IUPAC name
3-hydroxy-4-[2-hydroxy-4-[3-hydroxy-4-[(2-hydroxy-3,6-disulfo-1-naphthyl)azo]phenyl]phenyl]azo-naphthalene-2,7-disulfonic acid
State
State

In its solid form, it is a crystalline powder. In solutions, Congo Red exhibits different colors depending on the pH, showcasing its property as a pH indicator.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
394.00
Boiling point (Kelvin)
667.15
General information
Molecular weight
696.66g/mol
Molar mass
696.6640g/mol
Density
0.6065g/cm3
Appearence

Congo Red is an organic compound that appears as a red-brown powder. It is a conjugated diazo dye which produces intense red colors in aqueous solutions, and may appear differently under various pH conditions due to its role as a pH indicator.

Comment on solubility

Solubility of 3-hydroxy-4-[2-hydroxy-4-[3-hydroxy-4-[(2-hydroxy-3,6-disulfo-1-naphthyl)azo]phenyl]phenyl]azo-naphthalene-2,7-disulfonic acid

The solubility of 3-hydroxy-4-[2-hydroxy-4-[3-hydroxy-4-[(2-hydroxy-3,6-disulfo-1-naphthyl)azo]phenyl]phenyl]azo-naphthalene-2,7-disulfonic acid is influenced by several factors due to the presence of multiple functional groups and sulfonic acid moieties. In general, this compound can be characterized by:

  • High Water Solubility: As a sulfonic acid, it is likely to be highly soluble in water due to the ionic nature of the sulfonate groups.
  • Presence of Hydroxyl Groups: These groups can form hydrogen bonds with water, further enhancing solubility.
  • Potential pH Dependence: The solubility might vary with pH, as some of the acidic protons can dissociate, influencing the overall ionic charges in solution.
  • Temperature Effect: Increased temperatures generally lead to enhanced solubility in many organic compounds, including this one.

In summary, the solubility profile of this dye can be summarized as robust in aqueous solutions, and understanding its solubility will be crucial for its potential applications in various fields, such as dyeing and pH indicators. It's important to consider the specific solvent conditions for optimal use.

Interesting facts

Interesting Facts about 3-hydroxy-4-[2-hydroxy-4-[3-hydroxy-4-[(2-hydroxy-3,6-disulfo-1-naphthyl)azo]phenyl]phenyl]azo-naphthalene-2,7-disulfonic acid

This compound, often referred to as a synthetic dye, represents an intricate structure filled with fascinating features that highlight its application and significance in various fields. Here are some compelling insights:

  • Coloring Agent: It is primarily used as a dye in various industries, particularly in textiles and food products, due to its vibrant color and stability.
  • Environmental Impact: As a sulfonated azo dye, it’s pertinent to consider the environmental implications, especially regarding wastewater treatment. Its components can affect aquatic life, necessitating careful monitoring and management.
  • Research Use: The compound serves as a valuable tool in biochemical research, mainly as a probe in studying protein interactions and cellular behaviors.
  • Structure Complexity: The presence of several hydroxyl and sulfonic acid groups makes this compound highly polar, aiding in its solubility and interaction with various substrates.
  • Historical Relevance: Synthetic dyes such as this one revolutionized the coloring industry in the 19th century, offering a broader range of colors compared to natural dyes.

In summary, 3-hydroxy-4-[2-hydroxy-4-[3-hydroxy-4-[(2-hydroxy-3,6-disulfo-1-naphthyl)azo]phenyl]phenyl]azo-naphthalene-2,7-disulfonic acid is a prime example of how complex chemical structures can lead to practical applications in both industrial and research settings. As we continue to explore its potential, its significance in chemistry and environmental science cannot be overstated.

Synonyms
DTXSID60864322
4,4'-[(3,3'-Dihydroxy[1,1'-biphenyl]-4,4'-diyl)bis(diazene-2,1-diyl)]bis(3-hydroxynaphthalene-2,7-disulfonic acid)