Skip to main content

Acid Red 18

ADVERTISEMENT
Identification
Molecular formula
C20H11N2NaO5S
CAS number
2611-82-7
IUPAC name
4-amino-3-[4-[4-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3-methoxy-phenyl]-2-methoxy-phenyl]azo-naphthalene-1-sulfonic acid
State
State

At room temperature, Acid Red 18 is typically found in a solid state in the form of a crystalline powder.

Melting point (Celsius)
325.00
Melting point (Kelvin)
598.15
Boiling point (Celsius)
300.00
Boiling point (Kelvin)
573.15
General information
Molecular weight
604.57g/mol
Molar mass
604.5660g/mol
Density
1.7908g/cm3
Appearence

Acid Red 18, also known as eosin or Eosin B, typically appears as a dark red or garnet powder. It is a synthetic red dye commonly used in textiles, inks, and various industrial applications.

Comment on solubility

Solubility of 4-amino-3-[4-[4-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3-methoxy-phenyl]-2-methoxy-phenyl]azo-naphthalene-1-sulfonic acid

The solubility of the compound 4-amino-3-[4-[4-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3-methoxy-phenyl]-2-methoxy-phenyl]azo-naphthalene-1-sulfonic acid can be characterized by a few essential points:

  • High Water Solubility: Due to the presence of various sulfonic acid and hydroxyl functional groups, this compound demonstrates high solubility in water. The negatively charged sulfonate groups interact favorably with water molecules, promoting dissolution.
  • pH Dependency: The solubility may be influenced by the pH of the solution. At acidic pH levels, the protonation of amine groups can enhance solubility, while at higher pH levels, the ionization of sulfonic acid may also contribute to increased solvation.
  • Organic Solvent Interaction: While primarily soluble in aqueous environments, limited solubility may be observed in organic solvents due to competing polarity. Solvents like ethanol or acetone might show moderate solubility due to their polar aprotic characteristics.
  • Application Considerations: Its solubility properties make this compound suitable for various industrial and biological applications, particularly in dye formulations where solubility is crucial for effective color provision.

In summary, this compound’s solubility profile is predominantly favorable in aqueous media, offering versatility for numerous scientific applications.

Interesting facts

Interesting Facts about 4-amino-3-[4-[4-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3-methoxy-phenyl]-2-methoxy-phenyl]azo-naphthalene-1-sulfonic acid

The compound known as 4-amino-3-[4-[4-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3-methoxy-phenyl]-2-methoxy-phenyl]azo-naphthalene-1-sulfonic acid is a fascinating substance due to its intricate structure and significant applications in various fields. Here are some interesting highlights:

  • Dye Industry: This compound is primarily utilized as a dye, especially in textiles and printing. Its vibrant color and stability make it a preferred choice for coloring various materials.
  • Analytical Chemistry: It serves as a useful reagent in analytical chemistry for detecting and quantifying phenomena, owing to its unique chromophoric properties.
  • Biological Research: The presence of sulfonic acid groups enhances its water solubility, making it beneficial in biological studies, such as in cell staining and tracking.
  • Colorimetric Applications: The azo group in the compound allows for colorimetric measurements, which are essential in quantifying concentrations in solutions.

One of the defining characteristics of this compound is its complex azo linkage, which is responsible for the rich chromatic properties observed in many azo dyes. The detailed arrangement of functional groups within the molecule not only contributes to its reactive properties but also plays a vital role in its environmental stability.

As with many azo compounds, it is important to consider safety and environmental impacts when employing this dye in industrial applications. Researchers are continuously exploring safe and effective methods to reduce any potential hazardous effects associated with azo dyes.

In summary, 4-amino-3-[4-[4-[(1-hydroxy-4-sulfo-2-naphthyl)azo]-3-methoxy-phenyl]-2-methoxy-phenyl]azo-naphthalene-1-sulfonic acid exemplifies the blend of art and science, marrying the dazzling world of colors with the precision of chemistry.

Synonyms
Direct Violet 32 free acid
25188-50-5
52T8ZW8BPB
SCHEMBL1423903
DTXSID00859974
1-Naphthalenesulfonic acid, 4-amino-3-[[4'-[(1-hydroxy-4-sulfo-2-naphthalenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-
4-Amino-3-((4'-((1-hydroxy-4-sulfo-2-naphthalenyl)diazenyl)-3,3'-dimethoxy[biphenyl]-4-yl)diazenyl)-1-naphthalenesulfonic acid