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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
sodium;4-[3-[2-methyl-4-(p-tolylsulfonyloxy)phenyl]azoanilino]-3-nitro-benzenesulfonate
State
State

Solid at room temperature.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.00
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.66g/mol
Molar mass
696.6650g/mol
Density
0.7200g/cm3
Appearence

Congo Red is a reddish-brown powder that becomes red when dissolved in water. It is often used as a dye in histology due to its strong color properties.

Comment on solubility

Solubility of Sodium 4-[3-[2-Methyl-4-(p-tolylsulfonyloxy)phenyl]azoanilino]-3-nitro-benzenesulfonate

The solubility of the compound sodium 4-[3-[2-methyl-4-(p-tolylsulfonyloxy)phenyl]azoanilino]-3-nitro-benzenesulfonate is influenced by its unique chemical structure, characterized by both sulfonate and azo functional groups, which can enhance its interactions with water. When assessing its solubility, consider the following factors:

  • Ionic Nature: Being a sodium salt, it exhibits ionic solubility characteristics, typically dissolving well in polar solvents like water.
  • Temperature Dependency: Its solubility may increase with temperature, similar to most salts, allowing for the potential to be utilized in various temperature-dependent applications.
  • Presence of Functional Groups: The presence of sulfonate contributes to enhanced solubility due to its strong hydrogen bonding interactions with water molecules.

Despite these properties, the solubility may vary based on factors such as:

  1. pH Levels: Changes in pH can impact the ionization state of the sulfonate and azo groups, potentially affecting solubility.
  2. Concentration of Other Ions: The presence of competing ions in solution can also influence the solubility profile.
  3. Crystal Structure: The arrangement of molecules in the solid state may also impact how readily the compound can dissolve.

In summary, while sodium 4-[3-[2-methyl-4-(p-tolylsulfonyloxy)phenyl]azoanilino]-3-nitro-benzenesulfonate is expected to demonstrate reasonable solubility in polar solvents, its exact solubility is contingent upon various environmental and structural factors. This understanding is pivotal for its practical applications in different chemical processes.

Interesting facts

Interesting Facts about Sodium 4-[3-[2-Methyl-4-(p-tolylsulfonyloxy)phenyl]azoanilino]-3-nitro-benzenesulfonate

Sodium 4-[3-[2-methyl-4-(p-tolylsulfonyloxy)phenyl]azoanilino]-3-nitro-benzenesulfonate, also known for its vibrant color and unique properties, is a chemical compound that plays a significant role in various fields, especially in dye chemistry and materials science. Here are some intriguing facts about this compound:

  • Dye Chemistry: This compound is primarily utilized as a dye, noted for its brilliant hues and excellent stability, making it a popular choice in the textile and food industries.
  • Applications: Beyond textiles, it is also employed in the production of paints and plastics, offering not just color but also enhanced properties such as UV stability.
  • Structural Complexity: Its molecular structure showcases a fascinating combination of functional groups, including sulfonate, nitro, and azo groups, which contribute to its chemical reactivity and functionality.
  • Synthetic Pathways: The synthesis of this compound typically involves complex organic reactions, illustrating the beauty of chemical transformations and the art of organic synthesis.
  • Safety Considerations: Like many azo dyes, this compound requires careful handling due to potential health risks associated with some azo compounds. Appropriate safety measures should always be taken during its application and handling.

In summary, Sodium 4-[3-[2-Methyl-4-(p-tolylsulfonyloxy)phenyl]azoanilino]-3-nitro-benzenesulfonate represents a captivating intersection of color chemistry and advanced materials science. Its versatility and unique properties make it an interesting subject of study for both students and researchers alike.

Synonyms
EINECS 235-406-9
Benzenesulfonic acid, 4-((4-((2-methyl-4-(((4-methylphenyl)sulfonyl)oxy)phenyl)azo)phenyl)amino)-3-nitro-, monosodium salt
Benzenesulfonic acid, 4-((4-(2-(2-methyl-4-(((4-methylphenyl)sulfonyl)oxy)phenyl)diazenyl)phenyl)amino)-3-nitro-, sodium salt (1:1)
Sodium 4-(4-((2-methyl-4-(((p-tolyl)sulphonyl)oxy)phenyl)azo)anilino)-3-nitrobenzenesulphonate
Benzenesulfonic acid, 4-[[4-[[2-methyl-4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo]phenyl]amino]-3-nitro-, monosodium salt
Benzenesulfonic acid, 4-[[4-[2-[2-methyl-4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]diazenyl]phenyl]amino]-3-nitro-, sodium salt (1:1)
sodium 4-[4-[[2-methyl-4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo]anilino]-3-nitrobenzenesulphonate
235-406-9
Benzenesulfonic acid, 4-4-2-methyl-4-(4-methylphenyl)sulfonyloxyphenylazophenylamino-3-nitro-, monosodium salt
acid orange 67
C.I. ACID ORANGE 67
sodium;4-[3-[[2-methyl-4-(4-methylphenyl)sulfonyloxyphenyl]diazenyl]anilino]-3-nitrobenzenesulfonate
SCHEMBL5564324
DTXSID0065272
NS00019938
A909517
4-[[4-[[2-Methyl-4-[[(4-methylphenyl)sulfonyl]oxy]phenyl]azo]phenyl]amino]-3-nitrobenzenesulfonic acid sodium salt