Skip to main content

Congo red

ADVERTISEMENT
Identification
Molecular formula
C32H22N6Na4O14S4
CAS number
573-58-0
IUPAC name
tetrasodium;3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-6-sulfonato-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonate
State
State

Congo red is commonly in a solid state at room temperature in the form of a dry powder. This solid can dissolve in water to form a colored solution.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
320.00
Boiling point (Kelvin)
593.15
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
0.9720g/cm3
Appearence

Congo red appears as a red-brown powder. It is commonly used as a synthetic dye in histology and textile industries. Congo red exhibits a color change from blue-violet to red at different pH levels, making it a valuable pH indicator in laboratories.

Comment on solubility

Solubility of Tetrasodium 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-6-sulfonato-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonate

Tetrasodium 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-6-sulfonato-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonate is a complex organic compound notably recognized for its rich sodium ion content, contributing to significant solubility in water. Here are some key points regarding its solubility:

  • Water Solubility: This compound exhibits high solubility in water due to the presence of multiple sulfonate groups in its structure, which enhance interactions with water molecules.
  • Ionic Interactions: The tetrasodium form ensures that the compound remains dissociated in aqueous solutions, facilitating better dispersibility.
  • pH Dependence: Solubility can be influenced by the pH of the solution. Higher pH levels may improve solubility due to increased ionization of sulfonate groups.
  • Temperature Effects: Increasing temperature may also enhance solubility, as is common with many ionic and polar compounds.

In summary, the solubility of tetrasodium 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-6-sulfonato-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonate in aqueous environments makes it an efficient compound for various applications, particularly in fields that exploit its vibrant dye properties and biological functionality.

Interesting facts

Interesting Facts about Tetrasodium 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-6-sulfonato-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonate

Tetrasodium 3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonato-2-naphthyl)azo]-6-sulfonato-1-naphthyl]azo]-1-naphthyl]azo]naphthalene-1,5-disulfonate, often referred to in laboratory settings as a complex azo dye, has remarkable chemical and industrial significance. Here are some fascinating insights:

  • Dye Applications: This compound is primarily used as a dye in various industrial applications, particularly in textiles. Its vibrant colors and stability under different conditions make it a favored choice in dyeing processes.
  • Structure and Function: The intricate structure, characterized by multiple azo (-N=N-) linkages, contributes to its remarkable color diversity and binding properties with substrates.
  • Environmental Considerations: As with many synthetic dyes, the environmental impact of azo dyes has been a subject of study. Researchers are working to develop methods for efficient degradation and removal of these compounds from wastewater.
  • Biological Relevance: Some studies have indicated potential biological impacts of azo dyes, including their metabolic pathways in organisms. This aspect opens avenues for environmental and health-related research.
  • Historical Background: Azo dyes have a rich history, having been first synthesized in the 19th century. Tetrasodium's specific formulation highlights advancements in chemical synthesis and materials science.

This azo compound exemplifies the complexity and utility of synthetic dyes in modern chemistry and industrial applications. Its multi-faceted nature is a testament to the evolving landscape of chemical research and its implications for both industry and the environment.

Synonyms
Direct Blue 71
4399-55-7
DIRECTBLUE71
C.I. Direct Blue 71
MA5K8N8952
MFCD00003971
tetrasodium;3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfonatonaphthalen-2-yl)diazenyl]-6-sulfonatonaphthalen-1-yl]diazenyl]naphthalen-1-yl]diazenyl]naphthalene-1,5-disulfonate
Direct Blue 71 (Technical Grade)
1,5-Naphthalenedisulfonic acid, 3-((4-((4-((6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-6-sulfo-1-naphthalenyl)azo)-1-naphthalenyl)azo)-, tetrasodium salt
1,5-Naphthalenedisulfonic acid, 3-(2-(4-(2-(4-(2-(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl)-6-sulfo-1-naphthalenyl)diazenyl)-1-naphthalenyl)diazenyl)-, sodium salt (1:4)
Tetrasodium 3-((4-((4-((6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo)-6-sulphonato-1-naphthyl)azo)-1-naphthyl)azo)naphthalene-1,5-disulphonate
starbld0009568
DIRECT FAST BLUE
C.I. 34140
Direct Blue 71, tech.
N.S.FAST BLUE FR
CI DIRECT BLUE 71
SIRIUS SUPRA BLUE BRR
UNII-MA5K8N8952
EMPA 133
SUMILIGHT SUPRA BLUE BRR
DTXSID5044944
DB-71
EINECS 224-531-4
EINECS 278-274-8
AKOS024319045
Direct Blue 71, Dye content 50 %
J71.325B
CI DIRECT BLUE 71, TETRASODIUM SALT
C.I. DIRECT BLUE 71, TETRASODIUM SALT
Q27283738
1,5-Naphthalenedisulfonic acid, 3-((4-((4-((6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-6-sulfo-1-naphthaleny l)azo)-1-naphthalenyl)azo)-, tetrasodium salt
1,5-Naphthalenedisulfonic acid, 3-(2-(4-(2-(4-(2-(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl)-6-sulfo-1-naphthalenyl)diazenyl)-1-naphthalenyl)diazenyl)-, sodium salt (1:?)
3-((4-((4-((1-HYDROXY-3-SODIOSULFO-6-AMINONAPHTHALENE-2-YL)AZO)-6-SODIOSULFO-1-NAPHTHYL)AZO)-1-NAPHTHYL)AZO)NAPHTHALENE-1,5-DISULFONIC ACID DISODIUM SALT
3-((4-((4-((6-AMINO-1-HYDROXY-3-SODIOSULFO-2-NAPHTHALENYL)AZO)-6-SODIOSULFO-1-NAPHTHALENYL)AZO)-1-NAPHTHALENYL)AZO)NAPHTHALENE-1,5-DISULFONIC ACID DISODIUM SALT
3-((4-((4-((6-Amino-1-hydroxy-3-sulpho-2-naphthyl)azo)-6-sulpho-1-naphthyl)azo)-1-naphthyl)azo)naphthalene-1,5-disulphonic acid, sodium salt
3-((4-((4-((7-Amino-4-hydroxy-2-sulfo-3-naphthalenyl)azo)-6-sulfo-1-naphthalenyl)azo)-1-naphthalenyl)azo)-1,5-naphthalenedisulfonic acid, sodium salt
3-(4-(4-(1-HYDROXY-3-(SODIOOXYSULFONYL)-6-AMINONAPHTHALENE-2-YLAZO)-6-(SODIOOXYSULFONYL)NAPHTHALENE-1-YLAZO)NAPHTHALENE-1-YLAZO)NAPHTHALENE-1,5-BIS(SULFONIC ACID SODIUM) SALT
TETRASODIUM 3-((4-((4-((6-AMINO-1-HYDROXY-3-SULFONATO-2-NAPHTHYL)DIAZENYL)-6-SULFONATO-1-NAPHTHYL)DIAZENYL)-1-NAPHTHYL)DIAZENYL)-1,5-NAPHTHALENEDISULFONATE
TETRASODIUM 3-((4-((4-((6-AMINO-1-HYDROXY-3-SULFONATO-2-NAPHTHYL)DIAZENYL)-6-SULFONATO-1-NAPHTHYL)DIAZENYL)-1-NAPHTHYL)DIAZENYL)NAPHTHALENE-1,5-DISULFONATE
TETRASODIUM 3-((4-((4-(2-(6-AMINO-1-OXO-3-SULFONATONAPHTHALEN-2-YLIDENE)HYDRAZINYL)-6-SULFONATONAPHTHALEN-1-YL)DIAZENYL)NAPHTHALEN-1-YL)DIAZENYL)NAPHTHALENE-1,5-DISULFONATE