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Ponceau 4R

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Identification
Molecular formula
C20H11N2Na3O10S3
CAS number
2611-82-7
IUPAC name
7-benzamido-4-hydroxy-3-[4-(4-sulfophenyl)azophenyl]azo-naphthalene-2-sulfonic acid
State
State
Ponceau 4R is usually found as a solid at room temperature. It is commercially produced as a sodium salt to enhance its solubility in water. It readily dissolves in water but is less soluble in alcohol.
Melting point (Celsius)
300.00
Melting point (Kelvin)
573.15
Boiling point (Celsius)
232.00
Boiling point (Kelvin)
505.15
General information
Molecular weight
604.53g/mol
Molar mass
604.5290g/mol
Density
1.5000g/cm3
Appearence

Ponceau 4R typically appears as a red powder or granules. It is a synthetic dye used widely in food, cosmetics, and pharmaceuticals for its bright red color.

Comment on solubility

Solubility of 7-benzamido-4-hydroxy-3-[4-(4-sulfophenyl)azophenyl]azo-naphthalene-2-sulfonic acid

The solubility of 7-benzamido-4-hydroxy-3-[4-(4-sulfophenyl)azophenyl]azo-naphthalene-2-sulfonic acid can be influenced by several factors due to its complex molecular structure. Here are some key characteristics of its solubility:

  • Polar Character: The presence of sulfonic acid groups increases the polarity of the compound, typically enhancing its solubility in water.
  • pH Dependency: Solubility may vary with pH, as the ionization state of the sulfonic acid group can be affected. Generally, it is more soluble in acidic conditions.
  • Solvent Choice: It is likely to exhibit increased solubility in polar solvents, while non-polar solvents may not dissolve it effectively.

As a general guideline, compounds with multiple polar functional groups tend to demonstrate better solubility in aqueous solutions. However, the unique configuration and molecular interactions present in 7-benzamido-4-hydroxy-3-[4-(4-sulfophenyl)azophenyl]azo-naphthalene-2-sulfonic acid suggest that to obtain the most accurate solubility data, empirical testing in relevant solvents is advisable.

In conclusion, understanding the solubility profile of this compound is crucial for its applications, particularly in fields like dye chemistry and analytical chemistry, where solubility can significantly influence performance and functionality.

Interesting facts

Interesting Facts about 7-benzamido-4-hydroxy-3-[4-(4-sulfophenyl)azophenyl]azo-naphthalene-2-sulfonic acid

7-benzamido-4-hydroxy-3-[4-(4-sulfophenyl)azophenyl]azo-naphthalene-2-sulfonic acid is a fascinating compound that belongs to the class of azo dyes. It is particularly noteworthy for several reasons:

  • Applications in Dyeing: This compound is commonly used in the textile industry due to its vibrant color profile and excellent dyeing properties. Azo dyes like this one are known for their stability and ability to impart brightness to fabrics.
  • Biological Significance: Azo compounds are often studied for their potential biological activities. They have been researched for their use in drug delivery systems and biological imaging due to their unique optical properties.
  • Environmental Concerns: The synthesis and disposal of azo dyes can pose environmental challenges. These compounds may be toxic to aquatic life and can require careful management to prevent environmental contamination.
  • Synthetic Versatility: The complex structure of this compound allows for a range of modifications that can create derivatives with altered properties. This versatility is valuable for researchers looking to tailor the compound's characteristics for specific applications.

As Marie Curie once said, “Nothing in life is to be feared, it is only to be understood.” Understanding the chemistry behind azo dyes like this compound not only fuels advancements in dye technology but also leads to improvements in safety and sustainability practices within the chemical industry.

Overall, 7-benzamido-4-hydroxy-3-[4-(4-sulfophenyl)azophenyl]azo-naphthalene-2-sulfonic acid stands as a testament to the intricate relationship between chemistry, industry, and environmental awareness.

Synonyms
Direct Red 81 free acid
7-(Benzoylamino)-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-2-naphthalenesulfonic acid
RLM8W5IPXB
EINECS 246-727-9
DIRECT PAPER RED 4BL
7-benzamido-4-hydroxy-3-[[4-[(4-sulphophenyl)azo]phenyl]azo]naphthalene-2-sulphonic acid
2-Naphthalenesulfonic acid, 7-(benzoylamino)-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-
7-Benzamido-4-hydroxy-3-((4-((4-sulphophenyl)azo)phenyl)azo)naphthalene-2-sulphonic acid
2-NAPHTHALENESULFONIC ACID, 7-(BENZOYLAMINO)-4-HYDROXY-3-(2-(4-(2-(4-SULFOPHENYL)DIAZENYL)PHENYL)DIAZENYL)-
2-Naphthalenesulfonic acid, 7-(benzoylamino)-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-
7-(Benzoylamino)-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-2-naphthalenesulfonic acid
25188-42-5
7-benzamido-4-hydroxy-3-[[4-[(4-sulfophenyl)diazenyl]phenyl]diazenyl]naphthalene-2-sulfonic acid
UNII-RLM8W5IPXB
7-benzamido-4-hydroxy-3-({4-[(4-sulfophenyl)diazenyl]phenyl}diazenyl)naphthalene-2-sulfonic acid
Solaminrot 4B free acid
Sirius red 4B free acid
Solaminrot 4B (acid form)
Sirius red 4B (acid form)
(3Z)-7-benzamido-4-oxo-3-[[4-[(4-sulfophenyl)diazenyl]phenyl]hydrazinylidene]naphthalene-2-sulfonic acid
Direct Red 81 (acid form)
SCHEMBL8997551
CHEMBL3306477
SCHEMBL16675028
SCHEMBL18220658
CHEBI:88192
IGXZMQCLUNTWCC-UHFFFAOYSA-N
OCHRJJHVPRUZAC-AAKDRMKISA-N
NS00083678
Q27160114
7-benzamido-4-hydroxy-3-[(E)-[4-[(E)-(4-sulfophenyl)azo]phenyl]azo]naphthalene-2-sulfonic acid