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Ponceau 4R

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Identification
Molecular formula
C20H11N2Na3O10S3
CAS number
2611-82-7
IUPAC name
disodium;5-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-[4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-sulfonato-phenyl]benzenesulfonate
State
State

At room temperature, Ponceau 4R is typically in a solid state, either as a fine red powder or granules.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.15
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
760.69g/mol
Molar mass
760.6940g/mol
Density
0.6000g/cm3
Appearence

Ponceau 4R is a synthetic azo dye that typically appears as a red powder. It is commonly used as a food coloring agent and can also appear as granules when prepared for commercial use.

Comment on solubility

Solubility of Disodium 5-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-[4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-sulfonato-phenyl]benzenesulfonate

This compound, with its complex structure, exhibits interesting solubility characteristics primarily due to its ionic nature. Being a disodium salt, it is generally considered to be:

  • Soluble in water: The presence of sulfonate groups contributes to hydrophilicity, promoting dissolution in aqueous environments.
  • Limited solubility in organic solvents: Non-polar solvents may not effectively dissolve this compound due to its ionic sections and polar functionalities.

Factors influencing its solubility include:

  1. Temperature: Higher temperatures often enhance solubility for salts.
  2. pH: The solubility can be affected by the pH of the solution, impacting the ionization of functional groups.
  3. Presence of other ions: The solubility may vary depending on competing ions in the solution.

In summary, while the disodium form of this compound is relatively soluble in water, its behavior can vary significantly under different conditions. As stated, "Solubility is not just a physical property; it is a delicate balance of interactions at the molecular level."

Interesting facts

Interesting Facts about Disodium 5-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-[4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-sulfonato-phenyl]benzenesulfonate

This compound, often utilized in various applications, is noteworthy for its vibrant color and its role in the field of dyes and pigments. Here are some interesting facts:

  • Dyeing Agent: This compound is predominantly used as a dyeing agent, particularly in textile and paper industries due to its strong color properties.
  • Analytical Applications: It serves as a useful reagent in analytical chemistry, particularly for colorimetric assays, where it helps in the detection and quantification of certain chemicals.
  • Complex Molecular Structure: The complexity of its structure, featuring multiple functional groups, allows for intriguing interactions with other molecules, making it a subject of study in chemical bonding and reaction mechanisms.
  • Environmental Considerations: Given the rising importance of sustainable practices, research is ongoing about the environmental impact of azo dyes, which includes assessing biodegradability and potential toxicity.
  • Historical Significance: Azo compounds like this one have a rich history dating back to the 19th century when they became popular for their vivid colors and affordability.
  • Research Frontier: Ongoing studies focus on improving the safety and ecological footprint of azo dyes, paving the way for safer alternatives in industrial applications.

In summary, disodium 5-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-[4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-sulfonato-phenyl]benzenesulfonate represents not just a chemical compound, but a blend of art and science, underpinning important industrial processes while prompting essential discussions about health and the environment.

Synonyms
ACID YELLOW 42
(1,1'-Biphenyl)-2,2'-disulfonic acid, 4,4'-bis((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-, disodium salt
Disodium 4,4'-bis(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-ylazo)-1,1'-biphenyl-2,6'-disulphonate
(1,1'-Biphenyl)-2,2'-disulfonic acid, 4,4'-bis(2-(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)diazenyl)-, sodium salt (1:2)
[1,1'-Biphenyl]-2,2'-disulfonic acid, 4,4'-bis[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-, disodium salt
[1,1'-Biphenyl]-2,2'-disulfonic acid, 4,4'-bis[2-(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)diazenyl]-, sodium salt (1:2)
228-940-9
6375-55-9
C.I. Acid Yellow 42
C.I. Acid Yellow 42, disodium salt
Acid Yellow K
Acid Fast Yellow MR
Optanol Yellow R
Supranol Yellow R
Milling Yellow RX
Coomassie Yellow R
disodium;5-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]-2-[4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)diazenyl]-2-sulfonatophenyl]benzenesulfonate
Pharmatex Yellow G
Milling Yellow 3J
Pharmacine Yellow R
Coomassie Yellow RP
Midlon Yellow Propyl
Airedale Yellow 3GM
Sulfonine Yellow CSR
Erio Fast Yellow RL
Fast Silk Yellow SH
Amacid Fast Yellow RS
Benzyl Fast Yellow RS
Cyanine Fast Yellow M
Sulphon Yellow RS-CF
Acid Leather Yellow CRS
Belacid Milling Yellow R
Xylene Milling Yellow SH
Calcocid Milling Yellow R
Acid Anthracene Yellow GR
Suminol Milling Yellow MR
Kca Acid Milling Yellow M
Tertracid Milling Yellow R
Shikiso Acid Fast Yellow MR
Symulon Acid Fast Yellow MR
Naphthalene Leather Yellow 2G
EINECS 228-940-9
C.I. Acid Yellow 42 disodium salt
C.I. 22910
ZRYQXQUPWQNYSX-UHFFFAOYSA-L
[1,1'-Biphenyl]-2,2'-disulfonic acid,4,4'-bis[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-,disodium salt
SCHEMBL8911465
DTXSID90881406
AKOS015916469
C.I.Acid Yellow 42 (C.I.22910)
disodium 4,4'-bis[(E)-(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)diazenyl][1,1'-biphenyl]-2,2'-disulfonate