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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;6-acetamido-4-hydroxy-3-[4-(2-sulfonatooxyethylsulfonyl)phenyl]azo-naphthalene-2-sulfonate
State
State

At room temperature, Congo Red is typically found in its solid state as a powder. It is hygroscopic, meaning it can absorb moisture from the environment, but it remains in a stable solid form under standard conditions.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.00
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.66g/mol
Molar mass
696.6640g/mol
Density
0.9300g/cm3
Appearence

Congo Red appears as a red-brown powder. When dissolved in water, it imparts a vivid red color, which led to its use as a pH indicator and dye. Under a microscope, the dye often appears as elongated crystals.

Comment on solubility

Solubility of Disodium 6-Acetamido-4-hydroxy-3-[4-(2-sulfonatooxyethylsulfonyl)phenyl]azo-naphthalene-2-sulfonate

Disodium 6-acetamido-4-hydroxy-3-[4-(2-sulfonatooxyethylsulfonyl)phenyl]azo-naphthalene-2-sulfonate, often referred to as a dye or a dye intermediate, exhibits notable solubility characteristics that are crucial for its applications in various fields. Here are some key points:

  • Soluble in Water: This compound is highly soluble in water, primarily due to the presence of multiple sulfonate groups. These ionic groups enhance its affinity for polar solvents, making it readily dissolvable.
  • Effect of pH: The solubility may be affected by the pH of the solution. At higher pH levels, the solubility could potentially increase due to the ionization of functional groups, further enhancing its stability in aqueous solutions.
  • Temperature Dependence: As with many compounds, solubility may also vary with temperature; generally, higher temperatures can increase solubility, although the exact relationship should be determined experimentally.
  • Applications: Its excellent solubility is particularly advantageous in applications such as colorants in food and textiles, where uniform distribution in aqueous solutions is desired.

In summary, the solubility of this compound can be regarded as a significant factor influencing its practical applications. The presence of several ionic groups not only renders it soluble in water but also strengthens its interaction with substrates in diverse chemical environments.

Interesting facts

Interesting Facts about Disodium 6-Acetamido-4-hydroxy-3-[4-(2-sulfonatooxyethylsulfonyl)phenyl]azo-naphthalene-2-sulfonate

Disodium 6-acetamido-4-hydroxy-3-[4-(2-sulfonatooxyethylsulfonyl)phenyl]azo-naphthalene-2-sulfonate is a fascinating compound that reveals significant insights into the world of azo dyes and their applications. Known for its vibrant colors and structural complexity, this compound serves numerous roles in various fields, particularly in the textile industry:

  • Azo Dye Characteristics: The compound belongs to a class of azo dyes, which are renowned for their bright colors and ability to form stable dye complexes with various substrates. These colors are primarily due to the presence of the azo group (>N=N<), which can display different hues based on its molecular environment.
  • Applications in Textiles: One of the primary uses of this compound is in textile dyeing. It offers excellent color fastness, which is critical in maintaining the vibrancy of fabrics after washing.
  • Environmental Considerations: With the increasing awareness of eco-friendly practices, there is ongoing research on the synthesis and breakdown of azo dyes. The sulfonate groups in this compound improve its solubility in water, leading to better application methods in aqueous solutions.
  • Biological Significance: Research indicates that some azo compounds may possess biological activities, making them interesting subjects for studies in pharmaceuticals. Their potential applications extend beyond dyes into therapeutic fields.

Overall, compounds like disodium 6-acetamido-4-hydroxy-3-[4-(2-sulfonatooxyethylsulfonyl)phenyl]azo-naphthalene-2-sulfonate highlight the intricate relationship between chemistry, industry, and environmental sustainability. As chemists explore new formulations and applications, the impact of such compounds continues to evolve, making them worthy of study and appreciation in the scientific community.

Synonyms
20262-58-2
Brilliant orange 3R
Remazol Brilliant Orange 3R
12225-88-6
MFCD00013281
CHEBI:53730
remazole orange-3R
disodium;6-acetamido-4-hydroxy-3-[[4-(2-sulfonatooxyethylsulfonyl)phenyl]diazenyl]naphthalene-2-sulfonate
Reactive Orange 7
2-Naphthalenesulfonic acid, 6-(acetylamino)-4-hydroxy-3-((4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-, disodium salt
2-Naphthalenesulfonic acid, 6-(acetylamino)-4-hydroxy-3-[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, disodium salt
6-acetamido-4-hydroxy-3-4-2-(sulphonatooxy)ethylsulphonylphenylazonaphthalene-2-sulphonate (sodium salt)
C.I. REACTIVE ORANGE 16
Remazol Orange G
EINECS 243-653-9
C.I.Reactive Orange 7
Disodium 6-acetamido-4-hydroxy-3-((4-((2-(sulphonatooxy)ethyl)sulphonyl)phenyl)azo)naphthalene-2-sulphonate
C.I.Reactive Orange 16
Epitope ID:116217
EC 243-653-9
SCHEMBL523942
SCHEMBL524600
orb2565381
DTXSID5066586
SCHEMBL20483012
SCHEMBL29378688
AKOS037643596
FC34016
FR41439
AS-17191
BP-20531
Reactive Orange 16, Dye content >=70 %
NS00052043
2-Naphthalenesulfonic acid, 6-(acetylamino)-4-hydroxy-3-(2-(4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)diazenyl)-, sodium salt (1:2)
2-Naphthalenesulfonic acid, 6-(acetylamino)-4-hydroxy-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt
disodium 6-acetamido-4-hydroxy-3-[(4-{[2-(sulfonatooxy)ethyl]sulfonyl}phenyl)diazenyl]naphthalene-2-sulfonate
disodium;(3Z)-6-acetamido-4-oxo-3-[[4-(2-sulfonatooxyethylsulfonyl)phenyl]hydrazinylidene]naphthalene-2-sulfonate