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Sudan IV

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Identification
Molecular formula
C24H20N4O6S2
CAS number
85-83-6
IUPAC name
3-hydroxy-4-(2,4,5-trimethylphenyl)azo-naphthalene-2,7-disulfonic acid
State
State

At room temperature, Sudan IV is typically in a solid state, specifically as a crystalline powder.

Melting point (Celsius)
199.00
Melting point (Kelvin)
472.15
Boiling point (Celsius)
400.00
Boiling point (Kelvin)
673.15
General information
Molecular weight
456.54g/mol
Molar mass
456.5410g/mol
Density
1.4500g/cm3
Appearence

Sudan IV appears as a reddish-brown crystalline powder or solid. It is commonly used as a dye, providing a rich, deep red coloration.

Comment on solubility

Solubility of 3-hydroxy-4-(2,4,5-trimethylphenyl)azo-naphthalene-2,7-disulfonic acid

The solubility of 3-hydroxy-4-(2,4,5-trimethylphenyl)azo-naphthalene-2,7-disulfonic acid is influenced by various factors due to its complex structure. This compound exhibits specific solubility characteristics that can be summarized as follows:

  • Water Solubility: Generally, compounds with multiple sulfonic acid groups, like this one, are quite soluble in water due to their ionic nature.
  • Organic Solvents: The solubility in organic solvents may vary; it is less likely to dissolve well in non-polar solvents due to the presence of polar functional groups.
  • pH Dependence: The degree of protonation and thus the solubility can change significantly with pH. At low pH levels, the compound may exist more in its acid form, which could affect solubility.

According to solubility principles, as stated, "like dissolves like," meaning polar solvents will dissolve polar substances. Thus, the extensive sulfonate groups are expected to enhance solubility in polar environments.

Moreover, temperature can also play a role; generally, an increase in temperature often contributes to increased solubility as it helps break intermolecular forces. Overall, this compound is likely to exhibit good water solubility with varying characteristics in organic solvents.

Interesting facts

Interesting Facts about 3-Hydroxy-4-(2,4,5-trimethylphenyl)azo-naphthalene-2,7-disulfonic Acid

This fascinating compound is a member of the azo dye family, known for its vibrant colors and extensive use in various applications. Here are some intriguing aspects of 3-hydroxy-4-(2,4,5-trimethylphenyl)azo-naphthalene-2,7-disulfonic acid:

  • Azo Dyes: Azo compounds are characterized by the presence of a nitrogen-nitrogen double bond (N=N). They are widely recognized for their vivid colors, allowing them to be extensively utilized in textile, food, and cosmetic industries.
  • Functional Groups: The presence of hydroxyl (-OH) and sulfonic acid (-SO₃H) functional groups enhances the solubility of the dye in water. This solubility is crucial for applications such as dyeing fabrics and creating colored inks.
  • Environmental Impact: As with many synthetic dyes, there are concerns regarding their environmental impact. This particular compound has implications for water pollution, hence there is a continuous push for more eco-friendly alternatives in the dye industry.
  • Color Fastness: Azo dyes are known for their color fastness properties, which means they retain their color under various conditions. This makes them particularly valuable in applications where durability is important.
  • Research Significance: The study of compounds like this azo dye provides insights into the development of new materials and innovations in dye technology. Ongoing research aims to create dyes that are both effective and less harmful to the environment.

In summary, 3-hydroxy-4-(2,4,5-trimethylphenyl)azo-naphthalene-2,7-disulfonic acid represents a significant area of study in the intersection of chemistry, material science, and environmental sustainability. Researchers continue to explore its properties and applications, making it a relevant compound in modern chemistry.

Synonyms
25738-43-6
3-Hydroxy-4-(2-(2,4,5-trimethylphenyl)diazenyl)-2,7-naphthalenedisulfonic acid
3-Hydroxy-4-[2-(2,4,5-trimethylphenyl)diazenyl]-2,7-naphthalenedisulfonic acid
Ponceau 3R free acid
Food Red 6 free acid
WD0P7VB90K
C.i. food Red 6 (free acid)
UNII-WD0P7VB90K
2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-((2,4,5-trimethylphenyl)azo)-
2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-(2-(2,4,5-trimethylphenyl)diazenyl)-
CHEMBL2009344
DTXSID00859818
NCI60_000113
Q27292560
3-Hydroxy-4-[(2,4,5-trimethylphenyl)azo]-2,7-naphthalenedisulfonic acid, 9CI
3-Hydroxy-4-[(2,4,5-trimethylphenyl)diazenyl]naphthalene-2,7-disulfonic acid