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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
8-anilino-5-[[4-[(5-sulfo-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonic acid
State
State

The compound is typically in a solid state at room temperature, characterized by its crystalline powder form.

Melting point (Celsius)
357.00
Melting point (Kelvin)
630.00
Boiling point (Celsius)
488.00
Boiling point (Kelvin)
761.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.8610g/cm3
Appearence

Congo Red appears as a red-brown powder. It is a dark red to orange-brown solid that can dye materials in bright red hues. The color is sensitive to pH changes and can exhibit a color change from blue at acidic pH to red at alkaline pH.

Comment on solubility

Solubility of 8-anilino-5-[[4-[(5-sulfo-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonic acid

The compound 8-anilino-5-[[4-[(5-sulfo-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonic acid is a complex organic molecule that possesses a sulfonic acid functional group, making it inherently soluble in water. Here are some key points regarding its solubility:

  • Water Solubility: Due to the presence of sulfonic acid moieties, this compound is quite soluble in aqueous environments. The sulfonate group facilitates interaction with water molecules, allowing for effective dissolution.
  • Solvent Specificity: While it is primarily soluble in water, solubility in organic solvents is generally low to moderate. This is because the polar nature of the sulfonic acid group tends to repel non-polar solvents.
  • pH Dependence: The solubility of this compound may vary with pH, as the ionic state of the sulfonic acid can change in different pH conditions, enhancing or reducing solubility.

In conclusion, the solubility characteristics of 8-anilino-5-[[4-[(5-sulfo-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonic acid are influenced significantly by its functional groups, making it an interesting compound with notable hydrophilicity. As a *general rule*, compounds with sulfonic acid groups tend to exhibit *high aqueous solubility*, thereby making them suitable for various applications in aqueous environments.

Interesting facts

Interesting Facts about 8-Anilino-5-[[4-[(5-sulfo-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonic Acid

8-Anilino-5-[[4-[(5-sulfo-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonic acid, often referred to as a dye, belongs to an exciting class of compounds known as azo compounds. These compounds are characterized by the presence of the azo group (-N=N-), which is responsible for the vivid colors that many of them exhibit. Here are some noteworthy aspects:

  • Colorfulness: Azo dyes like this compound are famous for their vibrant hues and are extensively used in various industries, including textiles, printing, and food.
  • Applications: Its ability to form complexes makes it valuable in biotechnology and analytical chemistry, acting as indicators and stains.
  • Biological Significance: Notably, some azo compounds can exhibit antimicrobial properties, making them of interest in medicinal chemistry.
  • Environmental Concerns: Many azo dyes raise environmental concerns, as some of them can be toxic and their metabolic products potentially carcinogenic. This leads to strict regulations regarding azo dye usage.

As a chemistry student or scientist dealing with this compound, it's essential to be aware of both its capabilities and the implications of its use. As Marie Curie once said, "Nothing in life is to be feared, it is only to be understood." Therefore, understanding the properties, uses, and risks associated with compounds like 8-anilino-5-[[4-[(5-sulfo-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonic acid is crucial for those involved in chemical research and industry.

In conclusion, while this compound offers notable advantages in color applications and research, responsibly addressing its environmental impact is an ongoing challenge in the field of chemistry.

Synonyms
8-(phenylamino)-5-[[4-[(5-sulpho-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulphonic acid
8-(Phenylamino)-5-((4-((5-sulpho-1-naphthyl)azo)-1-naphthyl)azo)naphthalene-1-sulphonic acid
250-102-6
30255-64-2
NSC7830
C.I. 26370
Acid Black (24 and S)
EINECS 250-102-6
Sulfonine Black (B and BB)
Sulphonol Black (B and BR)
Alphanol Black (BBN and GV)
Durol Black (2B, B, BA)
Azo Cyanine Black (B and BB)
DTXSID40863095
Eriosin Fast Black (2B and B)
JWRKFFQQNVQJLW-UHFFFAOYSA-N
Supranol Fast Black (B and BB)
DTXSID101043727
Cyanine Fast Black (2B and 2BG)
Tertracid Fast Black (2B and CB)
Benzyl Fast Black (3B, B, CIB)
Pontacyl Fast Black (BBN and BBO)
Sulphonine Fast Black (GRV and RB)
Naphthazine Sulphon Black (BC and D)
Sulphon Cyanine Black (BA-CF and DN)
Acid Fast Black (2A, 2B, B and 8BX)
Amacid Milling Black (DN, S2B, SB, SG)
NS00083802
1-Naphthalenesulfonic acid, 8-(phenylamino)-5-[(E)-[4-[(E)-(5-sulfo-1-naphthalenyl)azo]-1-naphthalenyl]azo]-
8-Anilino-5-((4-((5-sulfo-1-naphthyl)diazenyl)-1-naphthyl)diazenyl)-1-naphthalenesulfonic acid
8-Anilino-5-({4-[(5-sulfo-1-naphthalenyl)diazenyl]-1-naphthalenyl}diazenyl)-1-naphthalenesulfonic acid
8-anilino-5-[(E)-[4-[(E)-(5-sulfo-1-naphthyl)azo]-1-naphthyl]azo]naphthalene-1-sulfonic acid
8-Anilino-5-[(E)-{4-[(E)-(5-sulfo-1-naphthalenyl)diazenyl]-1-naphthalenyl}diazenyl]-1-naphthalenesulfonic acid