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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;4-amino-3-[4-[4-[(2-hydroxy-8-sulfonato-1-naphthyl)azo]phenyl]phenyl]azo-naphthalene-1-sulfonate
State
State

Congo Red is typically a solid at room temperature.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.66g/mol
Molar mass
696.6640g/mol
Density
1.6800g/cm3
Appearence

Congo Red is an organic compound that appears as a vibrant red to brownish-red powder. It has a distinct, vivid color that is frequently used as a pH indicator in various scientific applications.

Comment on solubility

Solubility of Disodium 4-Amino-3-[4-[4-[(2-Hydroxy-8-sulfonato-1-naphthyl)azo]phenyl]phenyl]azo-Naphthalene-1-sulfonate

The solubility characteristics of this compound are quite intriguing, particularly due to its complex structure, featuring multiple sulfonate groups that enhance its interactions with solvents.

Key points regarding its solubility include:

  • Highly Soluble in Water: The presence of sulfonate groups (–SO3-) significantly increases the solubility of this compound in polar solvents, especially water.
  • Effect of pH: The solubility can be influenced by the pH of the solution. In more alkaline conditions, the compound tends to remain ionized and soluble.
  • Low Solubility in Organic Solvents: Unlike water, this compound exhibits low solubility in non-polar organic solvents due to its polar nature.

Overall, it can be stated that:

"The unique structural features of this compound contribute to its excellent water solubility, making it useful in various applications, especially in aqueous solutions."

This solubility profile indicates its potential versatility in the chemical and industrial fields, especially where aqueous processes are paramount. Understanding solubility is crucial for optimizing its use in applications like dyes, pharmaceuticals, and as a biochemical reagent.

Interesting facts

Interesting Facts about Disodium 4-amino-3-[4-[4-[(2-hydroxy-8-sulfonato-1-naphthyl)azo]phenyl]phenyl]azo-naphthalene-1-sulfonate

This complex compound is a member of the azo dye family, which are known for their vibrant colors and widely used in various applications. Below are some fascinating aspects of this compound:

  • Colorful Chemistry: Azo compounds contain the azo group (-N=N-), which is responsible for the bright and diverse colorations found in dyes. This compound is no exception, imparting rich hues that make it desirable in textile and food coloring.
  • Applications: Beyond its aesthetic appeal, this compound has significant uses in:
    • Textiles - For dyeing fabrics, providing permanent coloring.
    • Food industry - Used as food colorants due to its vibrant coloration.
    • Biological staining - Useful in laboratory settings for providing contrast in microscopy.
  • Environmental Concerns: While azo dyes are prevalent, some are known to be toxic or carcinogenic. This has led to increased regulatory scrutiny and the need for safer alternatives in dye production.
  • Historical Context: The development of azo dyes revolutionized the dye industry in the late 19th century. This specific compound showcases the creativity and advancements in organic chemistry, reflecting how synthetic dyes changed the landscape of coloring materials.
  • Structure and Stability: The presence of multiple aromatic rings and sulfonate groups in this compound offers enhanced stability and solubility in aqueous conditions, making it particularly effective in various applications.

As a chemistry student, delving into the world of azo dyes like this compound not only broadens your understanding of synthetic organic reactions but also highlights the ongoing balance between industrial applications and environmental responsibility. With an increasing demand for non-toxic and sustainable dye options, the future of compounds like these is evolving rapidly. As the saying goes, "With great colors come great responsibilities!"

Synonyms
Direct Red 17
C.I. Direct Red 17
2769-07-5
C.I. 22150
77IUR4G416
C.I. Direct Red 17, disodium salt
Congo Rubine
Chloramine Rubine
Direct Rubine R
Diaphtamine Rubine
Benzanil Rubine A
Benzo Congo Rubine
Chlorazol Rubine A
Benzanil Rubine AS
Diphenyl Rubine NR
Direct Bordeaux BK
Diazamine fuchsine O
1-Naphthalenesulfonic acid, 4-amino-3-((4'-((2-hydroxy-8-sulfo-1-naphthalenyl)azo)(1,1'-biphenyl)-4-yl)azo)-, sodium salt
Kayaku Direct Bordeaux BK
UNII-77IUR4G416
DTXSID7036799
CI 22150
Q27896804
1-NAPHTHALENESULFONIC ACID, 4-AMINO-3-(2-(4'-(2-(2-HYDROXY-8-SULFO-1-NAPHTHALENYL)DIAZENYL)(1,1'-BIPHENYL)-4-YL)DIAZENYL)-, SODIUM SALT (1:2)