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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
3-amino-4-[4-[4-[4-(p-tolylsulfonyloxy)phenyl]azophenyl]phenyl]azo-naphthalene-2,7-disulfonic acid
State
State

At room temperature, Congo Red is a solid. It is typically supplied as a powder and is known for its ability to form a colloidal solution when mixed with water.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.1000g/cm3
Appearence

Congo Red appears as a red to dark brown powder. When dissolved in water, it forms a red solution. Congo Red is known for its ability to change color based on pH, turning blue in acidic environments and red in more neutral to basic conditions.

Comment on solubility

Solubility Insights for 3-amino-4-[4-[4-[4-(p-tolylsulfonyloxy)phenyl]azophenyl]phenyl]azo-naphthalene-2,7-disulfonic acid

The solubility of 3-amino-4-[4-[4-[4-(p-tolylsulfonyloxy)phenyl]azophenyl]phenyl]azo-naphthalene-2,7-disulfonic acid is influenced by several factors:

  • Ionic Nature: The presence of sulfonic acid groups (-SO3H) enhances the compound's hydrophilicity, leading to better solubility in polar solvents such as water.
  • Hydrogen Bonding: Functional groups capable of hydrogen bonding can significantly increase solubility in aqueous environments.
  • Concentration Impact: High concentrations may lead to saturation and precipitation, indicating that solubility is not linear with concentration for this compound.
  • Temperature Dependency: Generally, solubility can vary with temperature; thus, increased temperatures may enhance the solubility of the compound.
  • pH Influence: The solubility may also change with the pH of the solution, as the ionization state of the sulfonic acid groups can alter their solubility characteristics.

In summary, while this compound shows a tendency towards solubility in polar solvents due to its ionic and polar functional groups, the exact solubility can vary depending on environmental conditions. “Understanding these factors is crucial for effective application and utilization in various chemical processes.”

Interesting facts

Interesting Facts about 3-amino-4-[4-[4-[4-(p-tolylsulfonyloxy)phenyl]azophenyl]phenyl]azo-naphthalene-2,7-disulfonic acid

This fascinating compound belongs to the larger class of azo dyes, known for their vibrant colors and diverse applications. The presence of multiple functional groups in its structure contributes to its unique properties and potential uses.

Key Features

  • Complex Structure: The intricate arrangement of amino, sulfonic, and azo groups provides a rich landscape for chemical interactions, making it an interesting subject for synthetic chemists.
  • Dye Applications: Azo compounds like this one are widely used in textiles, food, and cosmetic industries due to their ability to impart bright, long-lasting colors.
  • Potential in Biological Studies: Given its unique functional groups, this compound may exhibit interesting biological activities, making it a candidate for further pharmacological investigation.

The Science Behind the Compound

One of the remarkable aspects of 3-amino-4-[4-[4-[4-(p-tolylsulfonyloxy)phenyl]azophenyl]phenyl]azo-naphthalene-2,7-disulfonic acid is its ability to form hydrogen bonds and π-π stacking interactions, which can influence its solubility and reactivity in various solvents. This characteristic is crucial in determining how the compound interacts with biological entities, such as proteins or nucleic acids.

Moreover, the substitution of the sulfonyl group not only enhances the solubility in aqueous environments but also helps in the formation of stable complexes with metal ions, which could lead to interesting catalytic properties.

Quote to Reflect On

As Albert Einstein once said, “Everything should be made as simple as possible, but not simpler.” This statement resonates in the study of complex compounds like this azo dye where simplicity in design can lead to vast applications.

In summary, 3-amino-4-[4-[4-[4-(p-tolylsulfonyloxy)phenyl]azophenyl]phenyl]azo-naphthalene-2,7-disulfonic acid presents a rich tapestry of chemical properties, diverse uses, and potential for future research, making it a key player in both the world of dyes and beyond.

Synonyms
DTXSID70862935
3-Amino-4-{[4'-({4-[(4-methylbenzene-1-sulfonyl)oxy]phenyl}diazenyl)[1,1'-biphenyl]-4-yl]diazenyl}naphthalene-2,7-disulfonic acid