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Ponceau 4R

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Identification
Molecular formula
C20H11N2Na2O10S3
CAS number
2611-82-7
IUPAC name
disodium;6-hydroxy-5-(2-methoxy-5-methyl-4-sulfonato-phenyl)azo-naphthalene-2-sulfonate
State
State

This compound is typically a solid at room temperature, available as a fine, red powder used frequently as an azo dye in various applications.

Melting point (Celsius)
-1.00
Melting point (Kelvin)
-1.00
Boiling point (Celsius)
-1.00
Boiling point (Kelvin)
-1.00
General information
Molecular weight
604.47g/mol
Molar mass
604.4710g/mol
Density
1.3000g/cm3
Appearence

Ponceau 4R is a red synthetic azo dye that appears as a red powder. It is commonly used as a food coloring agent and is known for its bright, vivid red hue.

Comment on solubility

Solubility of Disodium 6-hydroxy-5-(2-methoxy-5-methyl-4-sulfonato-phenyl)azo-naphthalene-2-sulfonate

The solubility of disodium 6-hydroxy-5-(2-methoxy-5-methyl-4-sulfonato-phenyl)azo-naphthalene-2-sulfonate is influenced by several factors due to its complex chemical structure. This compound, being a disodium salt, generally exhibits good solubility in water. Here are some key aspects regarding its solubility:

  • High Water Solubility: The presence of sulfonate groups enhances its ability to dissolve in polar solvents like water.
  • Temperature Dependency: Solubility may increase with temperature, allowing for higher concentrations in solution.
  • pH Influence: The solubility can also be pH-dependent, with variations noted across different acidic or basic conditions.
  • Ion Interaction: The ionic nature can promote solubility through interactions with other ions in solution, resulting in stable dispersions.

In summary, this compound demonstrates a noteworthy solubility profile that is characterized by its ability to dissolve well in aqueous environments, influenced by various external factors. The phrase "like dissolves like" encapsulates the fundamental principle at play, as the polar sulfonate counterparts interact favorably with water molecules.

Interesting facts

Interesting Facts about Disodium 6-Hydroxy-5-(2-Methoxy-5-Methyl-4-Sulfonato-Phenyl)Azo-Naphthalene-2-Sulfonate

Disodium 6-hydroxy-5-(2-methoxy-5-methyl-4-sulfonato-phenyl)azo-naphthalene-2-sulfonate, commonly referred to through its various nomenclatures, is a fascinating compound with a range of applications, especially in the field of analytical chemistry. Below are some intriguing aspects of this compound:

  • Analytical Applications: This compound is often utilized as a dye in various analytical techniques, providing vibrant coloration that helps in distinguishing substances.
  • Stability: The sulfonate groups present in its structure greatly enhance its stability in aqueous solutions, making it versatile for lab experiments.
  • Environmental Significance: Compounds like this one are studied for their environmental impact as many azo dyes can have toxic effects, emphasizing the importance of carefully managing industrial waste.
  • Colorimetric Detection: It acts as a colorimetric reagent, allowing scientists to quantify concentrations of other substances by measuring color intensity.
  • Due Diligence: Researchers are encouraged to conduct thorough safety assessments when working with azo compounds, as some may degrade into harmful byproducts.

As a compound that bridges chemistry and environmental science, disodium 6-hydroxy-5-(2-methoxy-5-methyl-4-sulfonato-phenyl)azo-naphthalene-2-sulfonate serves as a pivotal element in both academic research and industrial applications. Its structural complexity, coupled with its functional versatility, continues to inspire investigations into new synthetic routes and usage in various fields.

In the words of chemists studying azo compounds, "Understanding the relationship between structure and function is key to unlocking the potential of these remarkable materials."

Synonyms
E129
RefChem:1084024
Allura Red AC
25956-17-6
Allura Red
Allura red AC dye
Food Red No. 40
C.I. Food Red 17
Food red 17
Curry red
FD&C Red No. 40
Fancy Red
Japan Food Red No. 40
ALLURA RED C.I.16035
Japan Red 40
CI 16035
Red 40
Red No. 40
FD and C Red No. 40
WZB9127XOA
DTXSID4024436
FD & C Red no. 40
MFCD00059526
2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-, disodium salt
Sodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate
Allura Red AC 100 microg/mL in Water
CI 16035; Food Red 17; Fancy Red;
2-Naphthalenesulfonic acid, 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-, disodium salt
Disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalenesulfonate
Disodium 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonate
Allura Red 40
Allura Red AC (Technical Grade)
FDC Red 40
CHEMBL174821
sodium (E)-6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate
C.I.16035
CCRIS 3493
FDC Red 40 dye
HSDB 7260
2-Naphthalenesulfonic acid, 6-hydroxy-5-[2-(2-methoxy-5-methyl-4-sulfophenyl)diazenyl]-, sodium salt (1:2)
EINECS 247-368-0
FD&C Red 40
UNII-WZB9127XOA
E 129
al-lura red ac
C. I. 16035
disodium 6-hydroxy-5-[(E)-(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate
763 - Colours
2-Naphthalenesulfonic acid, 6-hydroxy-5-(2-(2-methoxy-5-methyl-4-sulfophenyl)diazenyl)-, sodium salt (1:2)
FDC Red No. 40
ALLURA RED [FCC]
FD and C Red No.40
CI-FOOD RED 17
Disodium 6-hydroxy-5-((6-methoxy-4-sulfo-m-tolyl)azo)-2-naphthalenesulfonate
EC 247-368-0
2-Naphthalenesulfonic acid, 6-hydroxy-5-((6-methoxy-4-sulfo-m-tolyl)azo)-, disodium salt
ALLURA RED AC [MI]
FD&C RED NO.40
SCHEMBL324089
SCHEMBL340786
SCHEMBL563950
Allura Red AC (E 129)
D&C RED NO. 40
DTXCID504436
INS NO.129
orb1684778
ALLURA RED AC [MART.]
CHEMBL3188816
SCHEMBL29351791
SCHEMBL29671480
DTXSID70860355
INS-129
MSK2412
ALLURA RED AC DYE [HSDB]
CHEBI:172687
POXPUHKJGLHZEM-DJOSVPKASA-L
POXPUHKJGLHZEM-VIPPSAFOSA-L
Allura Red AC, analytical standard
D&C RED NO. 40 [II]
F D & C RED NO. 40
Allura Red AC, Dye content 80 %
FD&C RED NO. 40 [FCC]
FD&C RED NO. 40 [II]
Tox21_300393
AKOS015903081
AKOS025310826
FA17299
Disodium 6-hydroxy-5-((2-methoxy-4-sulphonato-m-tolyl)azo)naphthalene-2-sulphonate
Disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalene- sulfonate
disodium;6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl]naphthalene-2-sulfonate
F D & C RED #40 [VANDF]
NCGC00254423-01
6-Hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalene- sulfonic acid, disodium salt
BP-31017
DA-60931
F D & C RED #40 LAKE [VANDF]
CAS-25956-17-6
A0943
CI-(1975)NO.16035
E-129
F0325
NS00050913
NS00100125
D70160
Q419895
disodium;6-hydroxy-5-[(2-methoxy-5-methyl-4-sulonatophenyl)diazenyl]naphthalene-2-sulonate
1016649-41-4
6-Hydroxy-5-[2-(2-methoxy-5-methyl-4-sulfophenyl)diazenyl]-2-naphthalenesulfonic acid sodium;6-Hydroxy-5-[(6-methoxy-4-sulfo-m- toly l)azo]-2-naphthalenesulfonic acid disodium;Allura red 40
disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfonatophenyl)diazenyl)naphthalene-2-sulfonate
disodium;(5Z)-5-[(2-methoxy-5-methyl-4-sulfonatophenyl)hydrazinylidene]-6-oxonaphthalene-2-sulfonate