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Congo Red

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Identification
Molecular formula
C32H22N6Na4O14S4
CAS number
573-58-0
IUPAC name
tetrasodium;3-[4-[[4-[(4,8-disulfonato-2-naphthyl)azo]-3-methyl-phenyl]carbamoylamino]-2-methyl-phenyl]azonaphthalene-1,5-disulfonate
State
State

At room temperature, Congo Red is typically a solid in the form of a powder. It is soluble in water, producing a red solution that is used primarily as a textile dye and biological stain.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.00
Boiling point (Celsius)
1 000.00
Boiling point (Kelvin)
1 273.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.8911g/cm3
Appearence

Congo Red is a dye that appears as a red-brown powder. It is known for its vibrant red hue when dissolved in water. Under different pH conditions, it can change color, turning blue in an acidic medium and retaining its red color in an alkaline medium.

Comment on solubility

Solubility of Tetrasodium 3-[4-[[4-[(4,8-disulfonato-2-naphthyl)azo]-3-methyl-phenyl]carbamoylamino]-2-methyl-phenyl]azonaphthalene-1,5-disulfonate

The solubility of tetrasodium 3-[4-[[4-[(4,8-disulfonato-2-naphthyl)azo]-3-methyl-phenyl]carbamoylamino]-2-methyl-phenyl]azonaphthalene-1,5-disulfonate is quite interesting due to its unique structure and sulfonate groups. Its solubility characteristics can be summarized as follows:

  • Highly Soluble in Water: Due to the presence of multiple sulfonate groups, which can interact favorably with water, this compound exhibits a high degree of solubility in aqueous solutions.
  • pH Dependency: The solubility may vary with pH levels, with higher solubility typically observed in alkaline conditions. This is because the sulfonate groups become fully deprotonated and more negatively charged, enhancing their interaction with water.
  • Temperature Effects: Increased temperature generally leads to enhanced solubility for many ionic compounds; thus, heating the solution may result in greater solubility.
  • Formulation Considerations: In practical applications, the solubility of this dye is crucial for its effectiveness, especially in formulations requiring uniform distribution in aqueous systems.

To summarize, tetrasodium 3-[4-[[4-[(4,8-disulfonato-2-naphthyl)azo]-3-methyl-phenyl]carbamoylamino]-2-methyl-phenyl]azonaphthalene-1,5-disulfonate is highly soluble in water, with solubility influenced by pH and temperature. Understanding these factors is vital for its effective use in various scientific and industrial applications.

Interesting facts

Interesting Facts about Tetrasodium 3-[4-[[4-[(4,8-disulfonato-2-naphthyl)azo]-3-methyl-phenyl]carbamoylamino]-2-methyl-phenyl]azonaphthalene-1,5-disulfonate

Tetrasodium 3-[4-[[4-[(4,8-disulfonato-2-naphthyl)azo]-3-methyl-phenyl]carbamoylamino]-2-methyl-phenyl]azonaphthalene-1,5-disulfonate, commonly referred to in chemical circles for its complex structure, is predominantly known for its role as a dye compound. Here are some fascinating insights about this intriguing molecule:

  • Multiple Uses: This compound is mostly used in textiles, plastics, and food products. Its bright coloration makes it an effective dye, particularly for synthetic fibers.
  • Color Chemistry: The compound derives its vivid hue from the azo group, known for their ability to create vivid colors when tied to organic molecules. It is a classic example of how functional groups influence the properties of a compound.
  • Stability: The presence of sulfonate groups adds not only solubility but also stability to the dye, preventing degradation that can often occur in less stable compounds.
  • Environmental Considerations: The synthesis and application of azo dyes often bring discussions surrounding environmental impacts, prompting researchers to explore greener chemistry alternatives and biodegradable dyes.
  • Cultural Significance: Azo dyes, including this compound, have played a significant role in the cultural history of color use in art and craftsmanship throughout the ages, showcasing man’s ability to manipulate chemistry for creative expression.

In summary, Tetrasodium 3-[4-[[4-[(4,8-disulfonato-2-naphthyl)azo]-3-methyl-phenyl]carbamoylamino]-2-methyl-phenyl]azonaphthalene-1,5-disulfonate stands as an example of how complex chemistry can yield useful compounds with diverse applications. It reminds us of the intertwining of chemistry with creativity, technology, and environmental consciousness.


Synonyms
Direct Yellow 50
3214-47-9
Direct Fast Yellow R
C.I. Direct Yellow 50, tetrasodium salt
Sirius Light Yellow R
Direct Lightfast Yellow K
Sirius Light Yellow R Extra
3035X15Y8K
tetrasodium;3-[[4-[[4-[(4,8-disulfonatonaphthalen-2-yl)diazenyl]-3-methylphenyl]carbamoylamino]-2-methylphenyl]diazenyl]naphthalene-1,5-disulfonate
C.I. DIRECT YELLOW 50
1,5-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino(2-methyl-4,1-phenylene)-2,1-diazenediyl))bis-, sodium salt (1:4)
1,5-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino(2-methyl-4,1-phenylene)azo))bis-, tetrasodium salt
Direct Fast Yellow LR
Tetrasodium 3,3'-(carbonylbis(imino(2-methyl-4,1-phenylene)azo))bisnaphthalene-1,5-disulphonate
NSC-47763
DIRECTYELLOW50
UNII-3035X15Y8K
C.I. Direct Yellow 50 (VAN)
3,3'-[Carbonylbis[imino(2-methyl-4,1-phenylene)-2,1-diazenediyl]]bis-1,5-naphthalenedisulfonic Acid Sodium Salt (Technical Grade)
EINECS 221-728-7
NSC 47763
Direct Yellow 50 (C.I. 29025)
CI DIRECT YELLOW 50
ABCOL DIRECT YELLOW RLSW
DTXSID0041729
XRFRTDKENRGSSX-UHFFFAOYSA-J
MFCD00003997
Direct yellow 50, Dye content 40 %
CI 29025
J36.878D
DB-048170
C.I. 29025
C.I.Direct Yellow 50 (C.I. 29025)
NS00019973
CI DIRECT YELLOW 50, TETRASODIUM SALT
Q27255899
1,5-Naphthalenedisulfonicacid,3,3'-[carbonylbis[imino(2-methyl-4,1-phenylene)azo]]bis-, tetrasodium salt
3,3'-(CARBONYLBIS(IMINO(2-METHYL-4,1-PHENYLENE)AZO))BIS(1,5-NAPHTHALENEDISULFONIC ACID)TETRASODIUM SALT
tetrasodium 3-(2-{4-[({4-[2-(4,8-disulfonatonaphthalen-2-yl)diazen-1-yl]-3-methylphenyl}carbamoyl)amino]-2-methylphenyl}diazen-1-yl)naphthalene-1,5-disulfonate