Skip to main content

Chromotropic acid

ADVERTISEMENT
Identification
Molecular formula
C10H9NO8S2
CAS number
38832-53-4
IUPAC name
4-amino-3-hydroxy-naphthalene-2,7-disulfonic acid
State
State

At room temperature, chromotropic acid exists as a solid, typically available as a crystalline powder. It is fairly stable under normal conditions.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.00
Boiling point (Celsius)
687.90
Boiling point (Kelvin)
961.10
General information
Molecular weight
354.34g/mol
Molar mass
354.3410g/mol
Density
1.9403g/cm3
Appearence

Chromotropic acid is a white to off-white crystalline powder. It is often supplied in its hydrated forms which include mono-, di- or trihydrate. The powder is relatively stable although it tends to lose water rapidly in dry air.

Comment on solubility

Solubility of 4-amino-3-hydroxy-naphthalene-2,7-disulfonic acid

The solubility of 4-amino-3-hydroxy-naphthalene-2,7-disulfonic acid, often referred to as disulfonic acid, is influenced by several factors including pH, temperature, and the presence of solvents. General observations regarding its solubility include:

  • Aqueous Solubility: This compound is typically highly soluble in water due to the presence of multiple sulfonic acid groups, which are known to enhance solubility through the formation of hydrophilic interactions.
  • pH Dependence: The solubility may vary with changes in pH. At lower pH values, the protonation of functional groups can enhance solubility, while higher pH environments might lead to precipitation as the molecule tends to convert to its less soluble form.
  • Temperature Effects: Increasing the temperature often increases the solubility of many organic compounds, and disulfonic acid is no exception; solubility improves at elevated temperatures, making it easier to dissolve in higher concentrations.
  • Solvent Influence: In addition to water, the compound may display varying solubility profiles in organic solvents, showing increased solubility in polar solvents compared to non-polar solvents.

In practical applications, it’s essential to consider these factors for effective utilization of 4-amino-3-hydroxy-naphthalene-2,7-disulfonic acid, especially in fields such as dyes and pigments, where solubility impacts both efficiency and performance.

Interesting facts

Interesting Facts about 4-amino-3-hydroxy-naphthalene-2,7-disulfonic acid

4-amino-3-hydroxy-naphthalene-2,7-disulfonic acid is a fascinating compound in the field of organic chemistry, particularly known for its applications in dye chemistry and in the development of analytical techniques. Here are some noteworthy points about this compound:

  • Versatile Dye Intermediate: This compound serves as an important precursor in the synthesis of azo dyes, which are extensively used in textiles, inks, and food colorants.
  • pH Indicator: Due to its unique structural features, 4-amino-3-hydroxy-naphthalene-2,7-disulfonic acid can act as a pH indicator in various chemical analyses, changing color with different pH levels.
  • Sulfonic Acid Groups: The presence of multiple sulfonic acid groups enhances its solubility in water and increases its ionic strength, making it highly effective in aqueous solutions.
  • Biological Significance: Research indicates that compounds with similar structures may exhibit biological activities, such as antimicrobial and anti-inflammatory effects, highlighting the potential health applications of this family of compounds.
  • Research Tool: Scientists often use this compound as a model in studies involving electron transfer and reactivity due to its unique electronic properties.

In summary, 4-amino-3-hydroxy-naphthalene-2,7-disulfonic acid not only serves critical roles in the dye industry, but also holds potential in biological and analytical chemistry research. As we continue to explore its properties, more exciting applications may emerge!

Synonyms
R-Amine salt
2007-20-7
1-Amino-2-naphthol-3,6-disulfonic acid
4-Amino-3-hydroxy-2,7-naphthalenedisulfonic acid
UNII-4J1ZN24P49
4J1ZN24P49
2,7-Naphthalenedisulfonic acid, 4-amino-3-hydroxy-
1-Amino-2-naphthol-3,6-disulphonic acid sodium salt
Sodium salt of 1-amino-2-naphthol-3,6-disulphonic acid
3,6-Naphthalenedisulfonic acid, 1-amino-2-hydroxy-, disodium salt
3,6-NAPHTHALENEDISULFONIC ACID, 8-AMINO-7-HYDROXY-, SODIUM SALT
AMINO-2-NAPHTHOL-3,6-DISULFONIC ACID, 1-
1-AMINO-2-HYDROXY-3,6-NAPHTHALENEDISULFONIC ACID
UNII-A6I8ZBA730
1-Amino-2-Naphthol-3,6-disulfonic acid sodium
4-amino-3-hydroxynaphthalene-2,7-disulfonic acid
1-Amino-2-hydroxynaphthalene-3,6-disulfonic acid
disodium 4-amino-3-hydroxynaphthalene-2,7-disulfonate
SCHEMBL3201539
Q27259702