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Congo Red

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Identification
Molecular formula
C32H22N6Na3O6S3
CAS number
573-58-0
IUPAC name
trisodium;5-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]-2-hydroxy-benzoate
State
State

At room temperature, Congo Red is typically a solid. Due to its solubility in water, it can be utilized in various aqueous solutions for experimental and practical applications.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
337.00
Boiling point (Kelvin)
610.15
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
1.1000g/cm3
Appearence

Congo Red is a benzidine-based anionic diazo dye. It appears as a red-brown powder or granules and dissolves in water to give a red solution. Its bright colors are due to extensive conjugation and it has been historically used in dyeing textiles and as a pH indicator.

Comment on solubility

Solubility of Trisodium 5-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]-2-hydroxy-benzoate

The solubility of trisodium 5-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]-2-hydroxy-benzoate can be considered in the context of its complex structure. This compound, characterized by multiple azo groups and sulfonate functionalities, indicates that it has a significant potential for solubility in aqueous environments.

Several factors contribute to the solubility of this compound:

  • Presence of Sulfonate Groups: The sulfonate groups (–SO3H) enhance solubility by promoting ionic interactions with water molecules.
  • Ionic Nature: As a trisodium salt, this compound dissociates into sodium ions and other components upon dissolution, facilitating solubility in polar solvents.
  • Hydrophilic Functionalities: The presence of amino (–NH2) and hydroxy (–OH) groups contributes to hydrogen bonding with water, increasing interaction and solubility.
  • Molecular Size: Although larger molecules can pose some solubility challenges, the ionic and polar characteristics generally override size limitations.

In summary, this compound is likely to be highly soluble in water due to its ionic nature and the presence of hydrophilic groups. Therefore, one can expect it to exhibit good solubility characteristics, making it suitable for various applications in analytical chemistry and biological systems.

Interesting facts

Interesting Facts about Trisodium 5-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]-2-hydroxy-benzoate

This complex compound, often referred to in the context of dye chemistry and biochemistry, offers a fascinating glimpse into the world of azo dyes and their applications.

Key Features

  • Azo Dyes: This compound serves as an example of azo dyes, which are characterized by the presence of the azo group (–N=N–). These dyes are well-known for their vibrant colors and are widely used in textiles, inks, and food products.
  • Biological Importance: Compounds like this one have potential applications in biological systems. They can be used as indicators in biochemical assays due to their distinct color changes in response to pH and other environmental factors.
  • Environmental Consideration: The stability and color intensity of azo compounds like this are both advantages and concerns. While they are excellent dyes, their decomposition products can sometimes be harmful, making it essential to study their environmental impact.
  • Complex Structure: The intricate arrangement of aromatic rings and functional groups in this compound allows for a diverse range of interactions in chemical reactions, which is significant in synthetic organic chemistry.

As a scientist, one might say, "Understanding compounds like trisodium 5-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-1-naphthyl]azo]-6-sulfonato-1-naphthyl]azo]-2-hydroxy-benzoate is key to advancing materials science and enhancing our capabilities in designing more effective dyes and indicators." This compound exemplifies the intersection of chemistry, biology, and environmental science, providing a rich field for research and exploration.


Synonyms
3841-15-4
Trisodium 5-((4-((4-((6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo)-1-naphthyl)azo)-6-sulphonato-1-naphthyl)azo)salicylate
Direct Blue 148, trisodium salt
EINECS 223-334-0
NS00044896
C.I. DIRECT BLUE 148, TRISODIUM SALT