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Congo Red (acid form)

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Identification
Molecular formula
C10H10N2O7S2
CAS number
3567-65-5
IUPAC name
3,5-diamino-4-hydroxy-naphthalene-2,7-disulfonic acid
State
State

At room temperature, 3,5-diamino-4-hydroxy-naphthalene-2,7-disulfonic acid is typically a solid. It is insoluble in organic solvents and requires acidic conditions for dissolution. It is mostly handled in its disodium salt form, known as Congo Red, which is soluble in water.

Melting point (Celsius)
290.00
Melting point (Kelvin)
563.00
Boiling point (Celsius)
300.00
Boiling point (Kelvin)
573.00
General information
Molecular weight
366.33g/mol
Molar mass
366.3600g/mol
Density
0.9860g/cm3
Appearence

3,5-diamino-4-hydroxy-naphthalene-2,7-disulfonic acid typically appears as a reddish-brown powder or solid. It is commonly used in its salt form for dyeing textiles, where it exhibits a bright red color when dissolved in water.

Comment on solubility

Solubility of 3,5-Diamino-4-hydroxy-naphthalene-2,7-disulfonic Acid

The compound 3,5-diamino-4-hydroxy-naphthalene-2,7-disulfonic acid, with its complex structure, showcases intriguing solubility characteristics:

  • Water Solubility: Highly soluble in water due to the presence of multiple sulfonic acid groups, which enhance its ability to interact with polar solvents.
  • pH Dependency: The solubility can be influenced by the pH of the solution. In acidic conditions, the compound tends to remain ionized, maintaining its solubility.
  • Organic Solvents: Limited solubility in non-polar organic solvents, as the compound's polar functional groups do not interact favorably with hydrophobic environments.
  • Thermal Stability: While solubility is a crucial aspect, the compound’s thermal stability must also be considered, as heating can alter solubility dynamics.

In summary, 3,5-diamino-4-hydroxy-naphthalene-2,7-disulfonic acid exhibits high water solubility and is significantly affected by the pH level of the solution. This makes it particularly useful in applications where aqueous environments are involved.

Interesting facts

Interesting Facts about 3,5-Diamino-4-hydroxy-naphthalene-2,7-disulfonic Acid

3,5-Diamino-4-hydroxy-naphthalene-2,7-disulfonic acid is a fascinating compound with a variety of applications, particularly in the field of dye chemistry. Here are some compelling insights about this compound:

  • Dye Intermediate: This compound serves as an important intermediate in the synthesis of azo dyes, which are widely utilized in the textile industry for their vivid colors and strong adherence to fabric.
  • Structural Features: The presence of multiple amino groups and sulfonic acid groups contributes to its solubility in water, making it an attractive choice for use in aqueous dyeing processes.
  • Environmental Impact: The use of dyes poses a significant environmental challenge, and compounds like this one are being studied for their biodegradability and potential to produce less harmful effluents when used in dye formulations.
  • Research Significance: This compound is often explored in academic research, particularly for studies involving organic synthesis and the development of new materials with specific properties.
  • Color Chemistry: The ability of this compound to form various color shades when combined with other agents highlights its versatility in color Chemistry, allowing chemists to manipulate its application in various contexts.

Due to these unique characteristics, 3,5-diamino-4-hydroxy-naphthalene-2,7-disulfonic acid represents a vital intersection of chemistry, industry, and environmental science. As scientists continue to explore and examine the implications of such compounds, it becomes increasingly clear that the relationship between chemical structure and application is a focal point of modern chemical research.

Synonyms
3545-88-8
BRN 3110297
3,6-NAPHTHALENEDISULFONIC ACID, 1,7-DIAMINO-8-HYDROXY-
1,7-Diamino-8-naphthol-3,6-disulphonic acid
1,7-Diamino-8-naphthol-3,6-disulfonic acid
DTXSID70188960
2-14-00-00504 (Beilstein Handbook Reference)
DTXCID30111451
2V9CLS4Q4T
3,5-Diamino-4-hydroxy-2,7-naphthalenedisulfonic acid
2,7-Naphthalenedisulfonic acid, 3,5-diamino-4-hydroxy-
SCHEMBL24438859
8-amino-1-hydroxy-3,6-disulfo-2-naphthylamine
Diamino-8-naphthol-3,6-disulphonic acid, 1,7-
1,7-Diamino-8-hydroxy-3,6-naphthalenedisulfonic acid