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Pigment Red 4

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Identification
Molecular formula
C16H11N3O5S
CAS number
2814-77-9
IUPAC name
3-[4-(dihydroxyamino)-2-nitro-phenyl]imino-6-phenylimino-cyclohexa-1,4-diene-1-sulfonic acid
State
State

At room temperature, Pigment Red 4 is in the solid state. As a powder, it is stable, insoluble in water, and offers excellent dispersion properties in various media.

Melting point (Celsius)
317.00
Melting point (Kelvin)
590.15
Boiling point (Celsius)
504.00
Boiling point (Kelvin)
777.15
General information
Molecular weight
400.43g/mol
Molar mass
400.4280g/mol
Density
1.4500g/cm3
Appearence

Pigment Red 4 typically appears as a bright red powder. It is a widely used azo pigment known for its vibrant red color, high tinting strength, and good light fastness. This pigment is often utilized in paints, inks, plastics, and textiles.

Comment on solubility

Solubility of 3-[4-(dihydroxyamino)-2-nitro-phenyl]imino-6-phenylimino-cyclohexa-1,4-diene-1-sulfonic acid

The solubility of the compound 3-[4-(dihydroxyamino)-2-nitro-phenyl]imino-6-phenylimino-cyclohexa-1,4-diene-1-sulfonic acid can be quite complex due to its unique structure. Several factors contribute to its solubility characteristics:

  • Polarity: The presence of sulfonic acid and dihydroxyamino groups generally increases polarity, facilitating solubility in polar solvents such as water.
  • Hydrogen Bonding: The ability of this compound to form hydrogen bonds can enhance its solubility, particularly in aqueous environments.
  • Aromaticity: The inclusion of phenyl groups may introduce a degree of hydrophobicity, which can affect solubility in non-polar solvents.
  • pH Dependence: As with many sulfonic acids, the solubility could be dependent on the pH of the solution, with increased solubility at more acidic conditions.

In general, it is expected that this compound will exhibit better solubility in polar solvents, especially water, but may show variable solubility in organic solvents. While specific solubility data may be limited, the interactions mentioned above provide a conceptual framework for anticipating its solubility behavior.

Interesting facts

Interesting Facts about 3-[4-(Dihydroxyamino)-2-nitro-phenyl]imino-6-phenylimino-cyclohexa-1,4-diene-1-sulfonic acid

This compound, with a complex structure, belongs to a class of chemical entities that showcase the intricate interplay between organic and inorganic chemistry. Here are some fascinating aspects:

  • Functional Diversity: The presence of both amino and nitro groups in the structure enriches its reactivity, making it an interesting candidate for various chemical transformations.
  • Sulfonic Acid Group: The inclusion of a sulfonic acid group enhances the solubility in water compared to more hydrophobic organic compounds, making it useful in various aqueous applications.
  • Applications in Dyes: Compounds like this one can serve as intermediates in the synthesis of dyes, particularly because of the conjugated systems present in their structure.
  • Biological Significance: Some derivatives of similar compounds have shown biological activity, making this class relevant in medicinal chemistry and drug development.
  • Synthetic Chemistry: The synthesis of this compound could serve as an engaging project for chemistry students, illustrating multi-step synthetic pathways and the importance of functional group manipulation.

As chemists explore the potential applications of such compounds, the complexity and versatility of their structures present intriguing opportunities for research and innovation. In the future, understanding these compounds better may lead to breakthroughs in various fields, from pharmacology to materials science.

As we delve deeper into the nature of this compound, we are reminded of the powerful connections between molecular structure and function, illustrating the beauty of chemistry as both an art and a science.