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Congo Red

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Identification
Molecular formula
C32H22N6O6S2
CAS number
573-58-0
IUPAC name
3,6-bis[[4-(2,4-diaminophenyl)azophenyl]hydrazono]-4-imino-5-oxo-naphthalene-2,7-disulfonic acid
State
State

At room temperature, Congo Red is primarily a solid. It is commonly encountered in its powdered form, which is used for preparation of solutions or for dye purposes. The solid can be dispersed in water, where it dissolves to form a red solution. Its state as a solid makes it easy to handle and transport before use.

Melting point (Celsius)
225.00
Melting point (Kelvin)
498.15
Boiling point (Celsius)
320.00
Boiling point (Kelvin)
593.15
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.8981g/cm3
Appearence

Congo Red appears as a dark red or reddish-brown powder. It is known for its vibrant color when used in solutions. In aqueous solutions, it can exhibit varying shades of red, often transitioning to blue in acidic media. This characteristic property is utilized in its application as a pH indicator. Congo Red's appearance in textiles is a vivid red, which makes it popular for use in dyeing.

Comment on solubility

Solubility of 3,6-bis[[4-(2,4-diaminophenyl)azophenyl]hydrazono]-4-imino-5-oxo-naphthalene-2,7-disulfonic acid

The solubility of this compound, a complex azo dye derivative, showcases some intriguing properties. Here are several key points regarding its solubility:

  • Polar Nature: Due to the presence of multiple sulfonic acid groups, the compound is highly polar, which generally enhances its solubility in polar solvents.
  • Aqueous Solubility: The sulfonic groups make it more soluble in water, often resulting in a bright, vibrant color when dissolved.
  • Organic Solvents: Solubility in organic solvents may be limited due to the strong ionic interactions introduced by the sulfonic groups.
  • pH Dependency: Its solubility can vary greatly with changes in pH levels; it tends to be more soluble in alkaline conditions compared to acidic ones.
  • Concentration Factors: Higher concentrations can lead to precipitation due to saturation limits in polar solvents.

Overall, the intricate structure, featuring both hydrophobic and hydrophilic characteristics, influences its solubility behavior, making it a compound of interest in dye chemistry.

Interesting facts

Interesting Facts about 3,6-bis[[4-(2,4-diaminophenyl)azophenyl]hydrazono]-4-imino-5-oxo-naphthalene-2,7-disulfonic acid

This complex compound represents an intriguing class of molecules known as azo dyes, which are renowned for their vibrant coloration and diverse applications in various industries. Here are some compelling aspects to consider:

  • Azo Compounds: The compound features azo linkages, which are characterized by the presence of a -N=N- bond. Such groups are often responsible for the bright colors exhibited by azo dyes.
  • Applications: Due to its strong coloring properties, this compound can be utilized in dying textiles, food products, and in the manufacture of pigments for inks and plastics.
  • Hydrazone Dynamics: The hydrazone functionality within the structure adds to its versatility, making it a subject of interest for researchers exploring synthetic and medicinal chemistry.
  • Environmental Considerations: With increasing scrutiny on the environmental impact of synthetic dyes, studying compounds like this one raises important discussions on sustainability and the pursuit of eco-friendly alternatives.
  • Biological Activities: Compounds with multi-aminophenyl groups are often researched for potential pharmacological effects, with some demonstrating antibacterial and antifungal properties.
  • Complex Synthesis: The synthesis of this compound is non-trivial and requires careful control of reaction conditions, showcasing the intricate nature of organic synthesis in chemistry.

In summary, 3,6-bis[[4-(2,4-diaminophenyl)azophenyl]hydrazono]-4-imino-5-oxo-naphthalene-2,7-disulfonic acid stands out not only for its vivid aesthetic applications but also for its intriguing biochemical interactions and synthetic challenges. As researchers delve deeper into its properties and potentials, the compound continues to pave the way for innovations in both chemistry and materials science.