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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]naphthalene-1-sulfonic acid
State
State

At room temperature, Congo Red is typically found in a solid state.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.00
Boiling point (Celsius)
700.00
Boiling point (Kelvin)
973.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.9900g/cm3
Appearence

Congo Red appears as a dark red or purple powder. In solution, it exhibits an intense red color. It is widely used as a pH indicator due to its color-changing properties; it turns blue in basic solutions and red in acidic environments.

Comment on solubility

Solubility of 3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]naphthalene-1-sulfonic acid

The solubility of 3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]naphthalene-1-sulfonic acid in various solvents can be quite intriguing, as it exhibits a unique behavior influenced by its complex molecular structure. Typically, this compound demonstrates the following characteristics:

  • Aqueous Solubility: This compound is generally soluble in water due to the presence of the sulfonic acid group, which enhances its polarity.
  • Organic Solvents: Solubility in organic solvents may vary. Compounds like alcohols may dissolve better compared to non-polar solvents.
  • pH Dependence: The solubility is often affected by pH levels, with greater solubility observed in alkaline conditions due to deprotonation of the sulfonic acid group.
  • Temperature Effects: Increased temperature generally leads to improved solubility, as the kinetic energy of the molecules helps to overcome solute-solvent interactions.

Overall, understanding the solubility characteristics of this compound is essential for its application in various fields. As such, it is often noted that "the balance of hydrophilicity and hydrophobicity plays a crucial role in its solubility profile." This makes it particularly valuable in formulations where solubility is key to effectiveness and stability.

Interesting facts

Interesting Facts about 3-Hydroxy-4-[(1-hydroxy-2-naphthyl)azo]naphthalene-1-sulfonic Acid

3-Hydroxy-4-[(1-hydroxy-2-naphthyl)azo]naphthalene-1-sulfonic acid, often referred to in the scientific literature as "Acid Orange 7," is a fascinating compound with unique properties and applications. Here are some notable facts:

  • Dye and Pigment Properties: This compound belongs to the azo dye family, characterized by the presence of the azo group (-N=N-). It is predominantly used as a dye in the textile industry due to its vivid color.
  • pH Indicator: It serves not only as a coloring agent but also acts as a pH indicator, changing color in response to different pH levels, making it useful in analytical chemistry.
  • Biological Impacts: Researchers have studied its effects on biological systems. Some studies suggest it may have interactions with biological molecules that warrant further investigation.
  • Sulfonic Acid Group: The presence of the sulfonic acid functional group enhances its solubility in water, making it particularly effective in various aqueous applications, including biological experiments.
  • Environmental Considerations: As with many azo dyes, the environmental impact of 3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]naphthalene-1-sulfonic acid is under scrutiny, and researchers are exploring safer alternatives or degradation methods.

In summary, 3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]naphthalene-1-sulfonic acid is not just a compound of interest for its chemical structure but also a dynamic player in various chemical and environmental contexts. Its wide range of applications and biological interactions make it a significant subject of study in both industrial and academic settings.

As we continue to explore the multifaceted roles of such compounds, it is important to further understand their implications in both industry and health.

Synonyms
EINECS 247-234-1
1-Naphthalenesulfonic acid, 3-hydroxy-4-[(1-hydroxy-2-naphthalenyl)azo]-
1-Naphthalenesulfonic acid, 3-hydroxy-4-((1-hydroxy-2-naphtalenyl)azo)-
1-Naphthalenesulfonic acid, 3-hydroxy-4-((1-hydroxy-2-naphthalenyl)azo)-
1-Naphthalenesulfonic acid, 3-hydroxy-4-(2-(1-hydroxy-2-naphthalenyl)diazenyl)-
1-Naphthalenesulfonic acid, 3-hydroxy-4-[2-(1-hydroxy-2-naphthalenyl)diazenyl]-
25747-05-1
CHEMBL420168
T611
Solochrome Black 6B free acid
SCHEMBL4596966
X3454YRU3Z
DTXSID5067136
BRDGZOLJYALNOY-UHFFFAOYSA-N
BDBM50105976
NCI60_004127
NS00048310
1-Naphthalenesulfonic acid, 3-hydroxy-4-(1-hydroxy-2-naphthylazo)-
2-hydroxy-1-(1-hydroxy-2-naphthylazo)naphthalene-4-sulfonic acid
3-Hydroxy-4-((1-hydroxy-2-naphthyl)azo)naphthalene-1-sulphonic acid
3-Hydroxy-4-(1-hydroxy-naphthalen-2-ylazo)-naphthalene-1-sulfonic acid
3-Hydroxy-4-(1-hydroxy-naphthalen-2-ylazo)-naphthalene-1-sulfonic acid anion
3-Hydroxy-4-[2-(1-hydroxy-2-naphthalenyl)diazenyl]-1-naphthalenesulfonic acid