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Congo Red

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Identification
Molecular formula
C32H22N6O6S4
CAS number
573-58-0
IUPAC name
3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-6-sulfo-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonic acid
State
State

At room temperature, Congo Red exists as a solid powder. It is prone to forming aggregates due to its structure and sulfonic acid groups.

Melting point (Celsius)
357.00
Melting point (Kelvin)
630.15
Boiling point (Celsius)
315.00
Boiling point (Kelvin)
588.15
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.9005g/cm3
Appearence

Congo Red is typically seen as a red-brown powder. It is known for its application as a pH indicator and in biological staining, where it provides vibrant red hues.

Comment on solubility

Solubility of 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-6-sulfo-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonic acid

This complex azo compound, with its multiple sulfonic acid groups, exhibits interesting solubility characteristics. Typically, compounds containing sulfonic acid functional groups have a high affinity for water due to the ability of their polar sulfonate moieties to engage in strong hydrogen bonding and ion-dipole interactions with water molecules.

In the case of 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-6-sulfo-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonic acid, the following points can be emphasized:

  • Highly Soluble in Water: Thanks to the presence of multiple sulfonic acid groups, this compound is expected to be highly soluble in polar solvents, particularly water.
  • Influence of pH: The solubility can be affected by the pH of the solution; in more acidic or basic environments, the solubility might change due to protonation or deprotonation of the sulfonic acid groups.
  • Limited Solubility in Non-Polar Solvents: Due to the polar nature of the sulfonic acid groups, this compound likely has poor solubility in non-polar solvents such as hexane or toluene.
  • Applications: Due to its solubility in aqueous solutions, this compound is particularly useful in fields like dyes and pigments, where water solubility is a prerequisite for application.

In conclusion, the solubility of 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-6-sulfo-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonic acid aligns with the solubility behavior of sulfonic acid derivatives, demonstrating excellent solubility in water while showing limitations in non-polar environments.

Interesting facts

Interesting Facts about 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-6-sulfo-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonic acid

This intricate compound is a member of the azo dye family, which is well-known for its vibrant coloration and extensive applications in various industries. Here are some key points to consider:

  • Azo Dyes: This compound features the azo (-N=N-) functional group characteristic of azo dyes, which are widely used in textiles, food, and pharmaceutical industries due to their brilliant colors.
  • Application in Textiles: Azo compounds like this one are often employed for dyeing fabrics, providing intense hues that can withstand washing and light exposure.
  • Biological Significance: The presence of amino and hydroxy groups suggests potential applications in biology and medicine, such as in drug delivery systems or biomedical diagnostics.
  • Environmental Considerations: Although azo dyes are popular, their environmental impact has raised concerns, particularly regarding their potential to produce harmful degradation products.
  • Complex Structure: The multi-naphthyl structure highlights the compound's complexity, leading to unique chemical properties and interactions.

As you delve into the study of this compound, consider the balance between its vibrant utility in various applications and the need for responsible handling and disposal. The fascinating world of azo dyes continues to be an area of active research and discussion, especially in the context of sustainability and safety.

Synonyms
25255-02-1
3-(2-(4-(2-(4-(2-(6-Amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl)-6-sulfo-1-naphthalenyl)diazenyl)-1-naphthalenyl)diazenyl)-1,5-naphthalenedisulfonic acid
3-[2-[4-[2-[4-[2-(6-Amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl]-6-sulfo-1-naphthalenyl]diazenyl]-1-naphthalenyl]diazenyl]-1,5-naphthalenedisulfonic acid
Direct Blue 71 parent
Z22F9E7M75
Direct Blue 71
1,5-Naphthalenedisulfonic acid, 3-((4-((4-((6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-6-sulfo-1-naphthalenyl)azo)-1-naphthalenyl)azo)-
1,5-Naphthalenedisulfonic acid, 3-(2-(4-(2-(4-(2-(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl)-6-sulfo-1-naphthalenyl)diazenyl)-1-naphthalenyl)diazenyl)-
3-((4-((4-((7-Amino-4-hydroxy-2-sulfo-3-naphthalenyl)azo)-6-sulfo-1-naphthalenyl)azo)-1-naphthalenyl)azo)-1,5-naphthalenedisulfonic acid
UNII-Z22F9E7M75
DTXSID7045071
SCHEMBL13673457
J301.908J
C. I. 34140
Q27294893
3-((4-((4-((6-AMINO-1-HYDROXY-3-SULFO-2-NAPHTHYL)AZO)-6-SULFO-1-NAPHTHYL)AZO)-1-NAPHTHYL)AZO)-1,5-NAPHTHALENEDISULFONIC ACID
3-((4-((4-((6-AMINO-1-HYDROXY-3-SULFO-2-NAPHTHYL)DIAZENYL)-6-SULFO-1-NAPHTHYL)DIAZENYL)-1-NAPHTHYL)DIAZENYL)-1,5-NAPHTHALENEDISULFONIC ACID
3-((4-((4-((6-AMINO-1-HYDROXY-3-SULFO-2-NAPHTHYL)DIAZENYL)-6-SULFO-1-NAPHTHYL)DIAZENYL)-1-NAPHTHYL)DIAZENYL)NAPHTHALENE-1,5-DISULFONIC ACID
3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfo-2-naphthyl)azo]-6-sulfo-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonic acid
3-[[4-[[4-[(6-Amino-1-hydroxy-3-sulfo-2-naphtyl)azo]-6-sulfo-1-naphtyl]azo]-1-naphtyl]azo]-1,5-naphthalenedisulfonic acid